diff --git a/core/block_dragger.js b/core/block_dragger.js
index a1d4b6f2d..b7c11e8a3 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -10,61 +10,63 @@
  */
 'use strict';
 
-goog.provide('Blockly.BlockDragger');
+goog.module('Blockly.BlockDragger');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.blockAnimations');
-/** @suppress {extraRequire} */
-goog.require('Blockly.constants');
-goog.require('Blockly.Events');
+/* eslint-disable-next-line no-unused-vars */
+const BlockSvg = goog.requireType('Blockly.BlockSvg');
+const Coordinate = goog.require('Blockly.utils.Coordinate');
+/* eslint-disable-next-line no-unused-vars */
+const IBlockDragger = goog.require('Blockly.IBlockDragger');
+/* eslint-disable-next-line no-unused-vars */
+const IDragTarget = goog.requireType('Blockly.IDragTarget');
+const InsertionMarkerManager = goog.require('Blockly.InsertionMarkerManager');
+/* eslint-disable-next-line no-unused-vars */
+const WorkspaceSvg = goog.requireType('Blockly.WorkspaceSvg');
+const blockAnimation = goog.require('Blockly.blockAnimations');
+const dom = goog.require('Blockly.utils.dom');
+const events = goog.require('Blockly.Events');
+const registry = goog.require('Blockly.registry');
 /** @suppress {extraRequire} */
 goog.require('Blockly.Events.BlockDrag');
 /** @suppress {extraRequire} */
 goog.require('Blockly.Events.BlockMove');
-goog.require('Blockly.IBlockDragger');
-goog.require('Blockly.InsertionMarkerManager');
-goog.require('Blockly.registry');
-goog.require('Blockly.utils.Coordinate');
-goog.require('Blockly.utils.dom');
-
-goog.requireType('Blockly.BlockSvg');
-goog.requireType('Blockly.IDragTarget');
-goog.requireType('Blockly.WorkspaceSvg');
 
 
 /**
  * Class for a block dragger.  It moves blocks around the workspace when they
  * are being dragged by a mouse or touch.
- * @param {!Blockly.BlockSvg} block The block to drag.
- * @param {!Blockly.WorkspaceSvg} workspace The workspace to drag on.
+ * @param {!BlockSvg} block The block to drag.
+ * @param {!WorkspaceSvg} workspace The workspace to drag on.
  * @constructor
- * @implements {Blockly.IBlockDragger}
+ * @implements {IBlockDragger}
  */
-Blockly.BlockDragger = function(block, workspace) {
+const BlockDragger = function(block, workspace) {
   /**
    * The top block in the stack that is being dragged.
-   * @type {!Blockly.BlockSvg}
+   * @type {!BlockSvg}
    * @protected
    */
   this.draggingBlock_ = block;
 
   /**
    * The workspace on which the block is being dragged.
-   * @type {!Blockly.WorkspaceSvg}
+   * @type {!WorkspaceSvg}
    * @protected
    */
   this.workspace_ = workspace;
 
   /**
    * Object that keeps track of connections on dragged blocks.
-   * @type {!Blockly.InsertionMarkerManager}
+   * @type {!InsertionMarkerManager}
    * @protected
    */
   this.draggedConnectionManager_ =
-      new Blockly.InsertionMarkerManager(this.draggingBlock_);
+      new InsertionMarkerManager(this.draggingBlock_);
 
   /**
    * Which drag area the mouse pointer is over, if any.
-   * @type {?Blockly.IDragTarget}
+   * @type {?IDragTarget}
    * @private
    */
   this.dragTarget_ = null;
@@ -79,7 +81,7 @@ Blockly.BlockDragger = function(block, workspace) {
   /**
    * The location of the top left corner of the dragging block at the beginning
    * of the drag in workspace coordinates.
-   * @type {!Blockly.utils.Coordinate}
+   * @type {!Coordinate}
    * @protected
    */
   this.startXY_ = this.draggingBlock_.getRelativeToSurfaceXY();
@@ -91,14 +93,14 @@ Blockly.BlockDragger = function(block, workspace) {
    * @type {Array<!Object>}
    * @protected
    */
-  this.dragIconData_ = Blockly.BlockDragger.initIconData_(block);
+  this.dragIconData_ = initIconData(block);
 };
 
 /**
  * Sever all links from this object.
  * @package
  */
-Blockly.BlockDragger.prototype.dispose = function() {
+BlockDragger.prototype.dispose = function() {
   this.dragIconData_.length = 0;
 
   if (this.draggedConnectionManager_) {
@@ -110,19 +112,19 @@ Blockly.BlockDragger.prototype.dispose = function() {
  * Make a list of all of the icons (comment, warning, and mutator) that are
  * on this block and its descendants.  Moving an icon moves the bubble that
  * extends from it if that bubble is open.
- * @param {!Blockly.BlockSvg} block The root block that is being dragged.
+ * @param {!BlockSvg} block The root block that is being dragged.
  * @return {!Array<!Object>} The list of all icons and their locations.
- * @private
  */
-Blockly.BlockDragger.initIconData_ = function(block) {
+const initIconData = function(block) {
   // Build a list of icons that need to be moved and where they started.
-  var dragIconData = [];
-  var descendants = block.getDescendants(false);
-  for (var i = 0, descendant; (descendant = descendants[i]); i++) {
-    var icons = descendant.getIcons();
-    for (var j = 0; j < icons.length; j++) {
-      var data = {
-        // Blockly.utils.Coordinate with x and y properties (workspace
+  const dragIconData = [];
+  const descendants = block.getDescendants(false);
+
+  for (let i = 0, descendant; (descendant = descendants[i]); i++) {
+    const icons = descendant.getIcons();
+    for (let j = 0; j < icons.length; j++) {
+      const data = {
+        // Coordinate with x and y properties (workspace
         // coordinates).
         location: icons[j].getIconLocation(),
         // Blockly.Icon
@@ -136,16 +138,15 @@ Blockly.BlockDragger.initIconData_ = function(block) {
 
 /**
  * Start dragging a block.  This includes moving it to the drag surface.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the position at mouse down, in pixel units.
  * @param {boolean} healStack Whether or not to heal the stack after
  *     disconnecting.
  * @public
  */
-Blockly.BlockDragger.prototype.startDrag = function(
-    currentDragDeltaXY, healStack) {
-  if (!Blockly.Events.getGroup()) {
-    Blockly.Events.setGroup(true);
+BlockDragger.prototype.startDrag = function(currentDragDeltaXY, healStack) {
+  if (!events.getGroup()) {
+    events.setGroup(true);
   }
   this.fireDragStartEvent_();
 
@@ -159,9 +160,9 @@ Blockly.BlockDragger.prototype.startDrag = function(
 
   // During a drag there may be a lot of rerenders, but not field changes.
   // Turn the cache on so we don't do spurious remeasures during the drag.
-  Blockly.utils.dom.startTextWidthCache();
+  dom.startTextWidthCache();
   this.workspace_.setResizesEnabled(false);
-  Blockly.blockAnimations.disconnectUiStop();
+  blockAnimation.disconnectUiStop();
 
   if (this.shouldDisconnect_(healStack)) {
     this.disconnectBlock_(healStack, currentDragDeltaXY);
@@ -180,9 +181,9 @@ Blockly.BlockDragger.prototype.startDrag = function(
  * @return {boolean} True to disconnect the block, false otherwise.
  * @protected
  */
-Blockly.BlockDragger.prototype.shouldDisconnect_ = function(healStack) {
+BlockDragger.prototype.shouldDisconnect_ = function(healStack) {
   return !!(
-    this.draggingBlock_.getParent() ||
+      this.draggingBlock_.getParent() ||
       (healStack && this.draggingBlock_.nextConnection &&
        this.draggingBlock_.nextConnection.targetBlock()));
 };
@@ -191,18 +192,18 @@ Blockly.BlockDragger.prototype.shouldDisconnect_ = function(healStack) {
  * Disconnects the block and moves it to a new location.
  * @param {boolean} healStack Whether or not to heal the stack after
  *     disconnecting.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the position at mouse down, in pixel units.
  * @protected
  */
-Blockly.BlockDragger.prototype.disconnectBlock_ = function(
+BlockDragger.prototype.disconnectBlock_ = function(
     healStack, currentDragDeltaXY) {
   this.draggingBlock_.unplug(healStack);
-  var delta = this.pixelsToWorkspaceUnits_(currentDragDeltaXY);
-  var newLoc = Blockly.utils.Coordinate.sum(this.startXY_, delta);
+  const delta = this.pixelsToWorkspaceUnits_(currentDragDeltaXY);
+  const newLoc = Coordinate.sum(this.startXY_, delta);
 
   this.draggingBlock_.translate(newLoc.x, newLoc.y);
-  Blockly.blockAnimations.disconnectUiEffect(this.draggingBlock_);
+  blockAnimation.disconnectUiEffect(this.draggingBlock_);
   this.draggedConnectionManager_.updateAvailableConnections();
 };
 
@@ -210,31 +211,31 @@ Blockly.BlockDragger.prototype.disconnectBlock_ = function(
  * Fire a UI event at the start of a block drag.
  * @protected
  */
-Blockly.BlockDragger.prototype.fireDragStartEvent_ = function() {
-  var event = new (Blockly.Events.get(Blockly.Events.BLOCK_DRAG))(
+BlockDragger.prototype.fireDragStartEvent_ = function() {
+  const event = new (events.get(events.BLOCK_DRAG))(
       this.draggingBlock_, true, this.draggingBlock_.getDescendants(false));
-  Blockly.Events.fire(event);
+  events.fire(event);
 };
 
 /**
  * Execute a step of block dragging, based on the given event.  Update the
  * display accordingly.
  * @param {!Event} e The most recent move event.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the position at the start of the drag, in pixel units.
  * @public
  */
-Blockly.BlockDragger.prototype.drag = function(e, currentDragDeltaXY) {
-  var delta = this.pixelsToWorkspaceUnits_(currentDragDeltaXY);
-  var newLoc = Blockly.utils.Coordinate.sum(this.startXY_, delta);
+BlockDragger.prototype.drag = function(e, currentDragDeltaXY) {
+  const delta = this.pixelsToWorkspaceUnits_(currentDragDeltaXY);
+  const newLoc = Coordinate.sum(this.startXY_, delta);
   this.draggingBlock_.moveDuringDrag(newLoc);
   this.dragIcons_(delta);
 
-  var oldDragTarget = this.dragTarget_;
+  const oldDragTarget = this.dragTarget_;
   this.dragTarget_ = this.workspace_.getDragTarget(e);
 
   this.draggedConnectionManager_.update(delta, this.dragTarget_);
-  var oldWouldDeleteBlock = this.wouldDeleteBlock_;
+  const oldWouldDeleteBlock = this.wouldDeleteBlock_;
   this.wouldDeleteBlock_ = this.draggedConnectionManager_.wouldDeleteBlock();
   if (oldWouldDeleteBlock != this.wouldDeleteBlock_) {
     // Prevent unnecessary add/remove class calls.
@@ -253,26 +254,26 @@ Blockly.BlockDragger.prototype.drag = function(e, currentDragDeltaXY) {
 /**
  * Finish a block drag and put the block back on the workspace.
  * @param {!Event} e The mouseup/touchend event.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the position at the start of the drag, in pixel units.
  * @public
  */
-Blockly.BlockDragger.prototype.endDrag = function(e, currentDragDeltaXY) {
+BlockDragger.prototype.endDrag = function(e, currentDragDeltaXY) {
   // Make sure internal state is fresh.
   this.drag(e, currentDragDeltaXY);
   this.dragIconData_ = [];
   this.fireDragEndEvent_();
 
-  Blockly.utils.dom.stopTextWidthCache();
+  dom.stopTextWidthCache();
 
-  Blockly.blockAnimations.disconnectUiStop();
+  blockAnimation.disconnectUiStop();
 
-  var preventMove = !!this.dragTarget_ &&
+  const preventMove = !!this.dragTarget_ &&
       this.dragTarget_.shouldPreventMove(this.draggingBlock_);
   if (preventMove) {
     var newLoc = this.startXY_;
   } else {
-    var newValues = this.getNewLocationAfterDrag_(currentDragDeltaXY);
+    const newValues = this.getNewLocationAfterDrag_(currentDragDeltaXY);
     var delta = newValues.delta;
     var newLoc = newValues.newLocation;
   }
@@ -282,7 +283,7 @@ Blockly.BlockDragger.prototype.endDrag = function(e, currentDragDeltaXY) {
     this.dragTarget_.onDrop(this.draggingBlock_);
   }
 
-  var deleted = this.maybeDeleteBlock_();
+  const deleted = this.maybeDeleteBlock_();
   if (!deleted) {
     // These are expensive and don't need to be done if we're deleting.
     this.draggingBlock_.setDragging(false);
@@ -299,25 +300,23 @@ Blockly.BlockDragger.prototype.endDrag = function(e, currentDragDeltaXY) {
   }
   this.workspace_.setResizesEnabled(true);
 
-  Blockly.Events.setGroup(false);
+  events.setGroup(false);
 };
 
 /**
  * Calculates the drag delta and new location values after a block is dragged.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the start of the drag, in pixel units.
- * @return {{delta: !Blockly.utils.Coordinate, newLocation:
- *     !Blockly.utils.Coordinate}} New location after drag. delta is in
+ * @return {{delta: !Coordinate, newLocation:
+ *     !Coordinate}} New location after drag. delta is in
  *     workspace units. newLocation is the new coordinate where the block should
  *     end up.
  * @protected
  */
-Blockly.BlockDragger.prototype.getNewLocationAfterDrag_ = function(
-    currentDragDeltaXY) {
-  var newValues = {};
+BlockDragger.prototype.getNewLocationAfterDrag_ = function(currentDragDeltaXY) {
+  const newValues = {};
   newValues.delta = this.pixelsToWorkspaceUnits_(currentDragDeltaXY);
-  newValues.newLocation =
-      Blockly.utils.Coordinate.sum(this.startXY_, newValues.delta);
+  newValues.newLocation = Coordinate.sum(this.startXY_, newValues.delta);
   return newValues;
 };
 
@@ -328,7 +327,7 @@ Blockly.BlockDragger.prototype.getNewLocationAfterDrag_ = function(
  * @return {boolean} True if the block was deleted.
  * @protected
  */
-Blockly.BlockDragger.prototype.maybeDeleteBlock_ = function() {
+BlockDragger.prototype.maybeDeleteBlock_ = function() {
   if (this.wouldDeleteBlock_) {
     // Fire a move event, so we know where to go back to for an undo.
     this.fireMoveEvent_();
@@ -341,11 +340,11 @@ Blockly.BlockDragger.prototype.maybeDeleteBlock_ = function() {
 
 /**
  * Updates the necessary information to place a block at a certain location.
- * @param {!Blockly.utils.Coordinate} delta The change in location from where
+ * @param {!Coordinate} delta The change in location from where
  *     the block started the drag to where it ended the drag.
  * @protected
  */
-Blockly.BlockDragger.prototype.updateBlockAfterMove_ = function(delta) {
+BlockDragger.prototype.updateBlockAfterMove_ = function(delta) {
   this.draggingBlock_.moveConnections(delta.x, delta.y);
   this.fireMoveEvent_();
   if (this.draggedConnectionManager_.wouldConnectBlock()) {
@@ -361,10 +360,10 @@ Blockly.BlockDragger.prototype.updateBlockAfterMove_ = function(delta) {
  * Fire a UI event at the end of a block drag.
  * @protected
  */
-Blockly.BlockDragger.prototype.fireDragEndEvent_ = function() {
-  var event = new (Blockly.Events.get(Blockly.Events.BLOCK_DRAG))(
+BlockDragger.prototype.fireDragEndEvent_ = function() {
+  const event = new (events.get(events.BLOCK_DRAG))(
       this.draggingBlock_, false, this.draggingBlock_.getDescendants(false));
-  Blockly.Events.fire(event);
+  events.fire(event);
 };
 
 /**
@@ -374,12 +373,12 @@ Blockly.BlockDragger.prototype.fireDragEndEvent_ = function() {
  * @param {boolean} isEnd True if we are at the end of a drag, false otherwise.
  * @protected
  */
-Blockly.BlockDragger.prototype.updateToolboxStyle_ = function(isEnd) {
-  var toolbox = this.workspace_.getToolbox();
+BlockDragger.prototype.updateToolboxStyle_ = function(isEnd) {
+  const toolbox = this.workspace_.getToolbox();
 
   if (toolbox) {
-    var style = this.draggingBlock_.isDeletable() ? 'blocklyToolboxDelete' :
-                                                    'blocklyToolboxGrab';
+    const style = this.draggingBlock_.isDeletable() ? 'blocklyToolboxDelete' :
+                                                      'blocklyToolboxGrab';
 
     if (isEnd && typeof toolbox.removeStyle == 'function') {
       toolbox.removeStyle(style);
@@ -394,12 +393,11 @@ Blockly.BlockDragger.prototype.updateToolboxStyle_ = function(isEnd) {
  * Fire a move event at the end of a block drag.
  * @protected
  */
-Blockly.BlockDragger.prototype.fireMoveEvent_ = function() {
-  var event =
-      new (Blockly.Events.get(Blockly.Events.BLOCK_MOVE))(this.draggingBlock_);
+BlockDragger.prototype.fireMoveEvent_ = function() {
+  const event = new (events.get(events.BLOCK_MOVE))(this.draggingBlock_);
   event.oldCoordinate = this.startXY_;
   event.recordNew();
-  Blockly.Events.fire(event);
+  events.fire(event);
 };
 
 /**
@@ -407,7 +405,7 @@ Blockly.BlockDragger.prototype.fireMoveEvent_ = function() {
  * dragging block would be deleted if released immediately.
  * @protected
  */
-Blockly.BlockDragger.prototype.updateCursorDuringBlockDrag_ = function() {
+BlockDragger.prototype.updateCursorDuringBlockDrag_ = function() {
   this.draggingBlock_.setDeleteStyle(this.wouldDeleteBlock_);
 };
 
@@ -416,14 +414,14 @@ Blockly.BlockDragger.prototype.updateCursorDuringBlockDrag_ = function() {
  * correction for mutator workspaces.
  * This function does not consider differing origins.  It simply scales the
  * input's x and y values.
- * @param {!Blockly.utils.Coordinate} pixelCoord A coordinate with x and y
+ * @param {!Coordinate} pixelCoord A coordinate with x and y
  *     values in CSS pixel units.
- * @return {!Blockly.utils.Coordinate} The input coordinate divided by the
+ * @return {!Coordinate} The input coordinate divided by the
  *     workspace scale.
  * @protected
  */
-Blockly.BlockDragger.prototype.pixelsToWorkspaceUnits_ = function(pixelCoord) {
-  var result = new Blockly.utils.Coordinate(
+BlockDragger.prototype.pixelsToWorkspaceUnits_ = function(pixelCoord) {
+  const result = new Coordinate(
       pixelCoord.x / this.workspace_.scale,
       pixelCoord.y / this.workspace_.scale);
   if (this.workspace_.isMutator) {
@@ -431,7 +429,7 @@ Blockly.BlockDragger.prototype.pixelsToWorkspaceUnits_ = function(pixelCoord) {
     // oddities in our rendering optimizations.  The actual scale is the same as
     // the scale on the parent workspace.
     // Fix that for dragging.
-    var mainScale = this.workspace_.options.parentWorkspace.scale;
+    const mainScale = this.workspace_.options.parentWorkspace.scale;
     result.scale(1 / mainScale);
   }
   return result;
@@ -439,26 +437,26 @@ Blockly.BlockDragger.prototype.pixelsToWorkspaceUnits_ = function(pixelCoord) {
 
 /**
  * Move all of the icons connected to this drag.
- * @param {!Blockly.utils.Coordinate} dxy How far to move the icons from their
+ * @param {!Coordinate} dxy How far to move the icons from their
  *     original positions, in workspace units.
  * @protected
  */
-Blockly.BlockDragger.prototype.dragIcons_ = function(dxy) {
+BlockDragger.prototype.dragIcons_ = function(dxy) {
   // Moving icons moves their associated bubbles.
-  for (var i = 0; i < this.dragIconData_.length; i++) {
-    var data = this.dragIconData_[i];
-    data.icon.setIconLocation(Blockly.utils.Coordinate.sum(data.location, dxy));
+  for (let i = 0; i < this.dragIconData_.length; i++) {
+    const data = this.dragIconData_[i];
+    data.icon.setIconLocation(Coordinate.sum(data.location, dxy));
   }
 };
 
 /**
  * Get a list of the insertion markers that currently exist.  Drags have 0, 1,
  * or 2 insertion markers.
- * @return {!Array<!Blockly.BlockSvg>} A possibly empty list of insertion
+ * @return {!Array<!BlockSvg>} A possibly empty list of insertion
  *     marker blocks.
  * @public
  */
-Blockly.BlockDragger.prototype.getInsertionMarkers = function() {
+BlockDragger.prototype.getInsertionMarkers = function() {
   // No insertion markers with the old style of dragged connection managers.
   if (this.draggedConnectionManager_ &&
       this.draggedConnectionManager_.getInsertionMarkers) {
@@ -467,6 +465,6 @@ Blockly.BlockDragger.prototype.getInsertionMarkers = function() {
   return [];
 };
 
-Blockly.registry.register(
-    Blockly.registry.Type.BLOCK_DRAGGER, Blockly.registry.DEFAULT,
-    Blockly.BlockDragger);
+registry.register(registry.Type.BLOCK_DRAGGER, registry.DEFAULT, BlockDragger);
+
+exports = BlockDragger;
diff --git a/core/delete_area.js b/core/delete_area.js
index 384136a05..55eb61a34 100644
--- a/core/delete_area.js
+++ b/core/delete_area.js
@@ -12,23 +12,26 @@
 
 'use strict';
 
-goog.provide('Blockly.DeleteArea');
+goog.module('Blockly.DeleteArea');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.BlockSvg');
-goog.require('Blockly.DragTarget');
-goog.require('Blockly.IDeleteArea');
-
-goog.requireType('Blockly.IDraggable');
+const BlockSvg = goog.require('Blockly.BlockSvg');
+const DragTarget = goog.require('Blockly.DragTarget');
+/* eslint-disable-next-line no-unused-vars */
+const IDeleteArea = goog.require('Blockly.IDeleteArea');
+/* eslint-disable-next-line no-unused-vars */
+const IDraggable = goog.requireType('Blockly.IDraggable');
+const {inherits} = goog.require('Blockly.utils.object');
 
 /**
  * Abstract class for a component that can delete a block or bubble that is
  * dropped on top of it.
- * @extends {Blockly.DragTarget}
- * @implements {Blockly.IDeleteArea}
+ * @extends {DragTarget}
+ * @implements {IDeleteArea}
  * @constructor
  */
-Blockly.DeleteArea = function() {
-  Blockly.DeleteArea.superClass_.constructor.call(this);
+const DeleteArea = function() {
+  DeleteArea.superClass_.constructor.call(this);
 
   /**
    * Whether the last block or bubble dragged over this delete area would be
@@ -39,24 +42,24 @@ Blockly.DeleteArea = function() {
    */
   this.wouldDelete_ = false;
 };
-Blockly.utils.object.inherits(Blockly.DeleteArea, Blockly.DragTarget);
+inherits(DeleteArea, DragTarget);
 
 /**
  * Returns whether the provided block or bubble would be deleted if dropped on
  * this area.
  * This method should check if the element is deletable and is always called
  * before onDragEnter/onDragOver/onDragExit.
- * @param {!Blockly.IDraggable} element The block or bubble currently being
+ * @param {!IDraggable} element The block or bubble currently being
  *   dragged.
  * @param {boolean} couldConnect Whether the element could could connect to
  *     another.
  * @return {boolean} Whether the element provided would be deleted if dropped on
  *     this area.
  */
-Blockly.DeleteArea.prototype.wouldDelete = function(element, couldConnect) {
-  if (element instanceof Blockly.BlockSvg) {
-    var block = /** @type {Blockly.BlockSvg} */ (element);
-    var couldDeleteBlock = !block.getParent() && block.isDeletable();
+DeleteArea.prototype.wouldDelete = function(element, couldConnect) {
+  if (element instanceof BlockSvg) {
+    const block = /** @type {BlockSvg} */ (element);
+    const couldDeleteBlock = !block.getParent() && block.isDeletable();
     this.updateWouldDelete_(couldDeleteBlock && !couldConnect);
   } else {
     this.updateWouldDelete_(element.isDeletable());
@@ -69,6 +72,8 @@ Blockly.DeleteArea.prototype.wouldDelete = function(element, couldConnect) {
  * @param {boolean} wouldDelete The new value for the wouldDelete state.
  * @protected
  */
-Blockly.DeleteArea.prototype.updateWouldDelete_ = function(wouldDelete) {
+DeleteArea.prototype.updateWouldDelete_ = function(wouldDelete) {
   this.wouldDelete_ = wouldDelete;
 };
+
+exports = DeleteArea;
diff --git a/core/field_image.js b/core/field_image.js
index eed381b63..9edc92c56 100644
--- a/core/field_image.js
+++ b/core/field_image.js
@@ -10,15 +10,16 @@
  */
 'use strict';
 
-goog.provide('Blockly.FieldImage');
+goog.module('Blockly.FieldImage');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.Field');
-goog.require('Blockly.fieldRegistry');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.dom');
-goog.require('Blockly.utils.object');
-goog.require('Blockly.utils.Size');
-goog.require('Blockly.utils.Svg');
+const Field = goog.require('Blockly.Field');
+const Size = goog.require('Blockly.utils.Size');
+const Svg = goog.require('Blockly.utils.Svg');
+const fieldRegistry = goog.require('Blockly.fieldRegistry');
+const {createSvgElement, XLINK_NS} = goog.require('Blockly.utils.dom');
+const {inherits} = goog.require('Blockly.utils.object');
+const {replaceMessageReferences} = goog.require('Blockly.utils');
 
 
 /**
@@ -27,32 +28,35 @@ goog.require('Blockly.utils.Svg');
  * @param {!(string|number)} width Width of the image.
  * @param {!(string|number)} height Height of the image.
  * @param {string=} opt_alt Optional alt text for when block is collapsed.
- * @param {function(!Blockly.FieldImage)=} opt_onClick Optional function to be
+ * @param {function(!FieldImage)=} opt_onClick Optional function to be
  *     called when the image is clicked. If opt_onClick is defined, opt_alt must
  *     also be defined.
  * @param {boolean=} opt_flipRtl Whether to flip the icon in RTL.
  * @param {Object=} opt_config A map of options used to configure the field.
- *    See the [field creation documentation]{@link https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/image#creation}
+ *    See the [field creation documentation]{@link
+ * https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/image#creation}
  *    for a list of properties this parameter supports.
- * @extends {Blockly.Field}
+ * @extends {Field}
  * @constructor
  */
-Blockly.FieldImage = function(src, width, height,
-    opt_alt, opt_onClick, opt_flipRtl, opt_config) {
+const FieldImage = function(
+    src, width, height, opt_alt, opt_onClick, opt_flipRtl, opt_config) {
   // Return early.
   if (!src) {
     throw Error('Src value of an image field is required');
   }
-  src = Blockly.utils.replaceMessageReferences(src);
-  var imageHeight = Number(Blockly.utils.replaceMessageReferences(height));
-  var imageWidth = Number(Blockly.utils.replaceMessageReferences(width));
+  src = replaceMessageReferences(src);
+  const imageHeight = Number(replaceMessageReferences(height));
+  const imageWidth = Number(replaceMessageReferences(width));
   if (isNaN(imageHeight) || isNaN(imageWidth)) {
-    throw Error('Height and width values of an image field must cast to' +
-      ' numbers.');
+    throw Error(
+        'Height and width values of an image field must cast to' +
+        ' numbers.');
   }
   if (imageHeight <= 0 || imageWidth <= 0) {
-    throw Error('Height and width values of an image field must be greater' +
-      ' than 0.');
+    throw Error(
+        'Height and width values of an image field must be greater' +
+        ' than 0.');
   }
 
   // Initialize configurable properties.
@@ -70,23 +74,21 @@ Blockly.FieldImage = function(src, width, height,
    */
   this.altText_ = '';
 
-  Blockly.FieldImage.superClass_.constructor.call(
-      this, src, null, opt_config);
+  FieldImage.superClass_.constructor.call(this, src, null, opt_config);
 
   if (!opt_config) {  // If the config wasn't passed, do old configuration.
     this.flipRtl_ = !!opt_flipRtl;
-    this.altText_ = Blockly.utils.replaceMessageReferences(opt_alt) || '';
+    this.altText_ = replaceMessageReferences(opt_alt) || '';
   }
 
   // Initialize other properties.
   /**
    * The size of the area rendered by the field.
-   * @type {Blockly.utils.Size}
+   * @type {Size}
    * @protected
    * @override
    */
-  this.size_ = new Blockly.utils.Size(imageWidth,
-      imageHeight + Blockly.FieldImage.Y_PADDING);
+  this.size_ = new Size(imageWidth, imageHeight + FieldImage.Y_PADDING);
 
   /**
    * Store the image height, since it is different from the field height.
@@ -97,7 +99,7 @@ Blockly.FieldImage = function(src, width, height,
 
   /**
    * The function to be called when this field is clicked.
-   * @type {?function(!Blockly.FieldImage)}
+   * @type {?function(!FieldImage)}
    * @private
    */
   this.clickHandler_ = null;
@@ -113,29 +115,30 @@ Blockly.FieldImage = function(src, width, height,
    */
   this.imageElement_ = null;
 };
-Blockly.utils.object.inherits(Blockly.FieldImage, Blockly.Field);
+inherits(FieldImage, Field);
 
 /**
  * The default value for this field.
  * @type {*}
  * @protected
  */
-Blockly.FieldImage.prototype.DEFAULT_VALUE = '';
+FieldImage.prototype.DEFAULT_VALUE = '';
 
 /**
  * Construct a FieldImage from a JSON arg object,
  * dereferencing any string table references.
  * @param {!Object} options A JSON object with options (src, width, height,
  *    alt, and flipRtl).
- * @return {!Blockly.FieldImage} The new field instance.
+ * @return {!FieldImage} The new field instance.
  * @package
  * @nocollapse
  */
-Blockly.FieldImage.fromJson = function(options) {
+FieldImage.fromJson = function(options) {
   // `this` might be a subclass of FieldImage if that class doesn't override
   // the static fromJson method.
-  return new this(options['src'], options['width'], options['height'],
-      undefined, undefined, undefined, options);
+  return new this(
+      options['src'], options['width'], options['height'], undefined, undefined,
+      undefined, options);
 };
 
 /**
@@ -144,14 +147,14 @@ Blockly.FieldImage.fromJson = function(options) {
  * @type {number}
  * @private
  */
-Blockly.FieldImage.Y_PADDING = 1;
+FieldImage.Y_PADDING = 1;
 
 /**
  * Editable fields usually show some sort of UI indicating they are
  * editable. This field should not.
  * @type {boolean}
  */
-Blockly.FieldImage.prototype.EDITABLE = false;
+FieldImage.prototype.EDITABLE = false;
 
 /**
  * Used to tell if the field needs to be rendered the next time the block is
@@ -160,7 +163,7 @@ Blockly.FieldImage.prototype.EDITABLE = false;
  * @type {boolean}
  * @protected
  */
-Blockly.FieldImage.prototype.isDirty_ = false;
+FieldImage.prototype.isDirty_ = false;
 
 /**
  * Configure the field based on the given map of options.
@@ -168,27 +171,26 @@ Blockly.FieldImage.prototype.isDirty_ = false;
  * @protected
  * @override
  */
-Blockly.FieldImage.prototype.configure_ = function(config) {
-  Blockly.FieldImage.superClass_.configure_.call(this, config);
+FieldImage.prototype.configure_ = function(config) {
+  FieldImage.superClass_.configure_.call(this, config);
   this.flipRtl_ = !!config['flipRtl'];
-  this.altText_ = Blockly.utils.replaceMessageReferences(config['alt']) || '';
+  this.altText_ = replaceMessageReferences(config['alt']) || '';
 };
 
 /**
  * Create the block UI for this image.
  * @package
  */
-Blockly.FieldImage.prototype.initView = function() {
-  this.imageElement_ = Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.IMAGE,
-      {
+FieldImage.prototype.initView = function() {
+  this.imageElement_ = createSvgElement(
+      Svg.IMAGE, {
         'height': this.imageHeight_ + 'px',
         'width': this.size_.width + 'px',
         'alt': this.altText_
       },
       this.fieldGroup_);
-  this.imageElement_.setAttributeNS(Blockly.utils.dom.XLINK_NS,
-      'xlink:href', /** @type {string} */ (this.value_));
+  this.imageElement_.setAttributeNS(
+      XLINK_NS, 'xlink:href', /** @type {string} */ (this.value_));
 
   if (this.clickHandler_) {
     this.imageElement_.style.cursor = 'pointer';
@@ -198,7 +200,7 @@ Blockly.FieldImage.prototype.initView = function() {
 /**
  * @override
  */
-Blockly.FieldImage.prototype.updateSize_ = function() {
+FieldImage.prototype.updateSize_ = function() {
   // NOP
 };
 
@@ -208,7 +210,7 @@ Blockly.FieldImage.prototype.updateSize_ = function() {
  * @return {?string} A string, or null if invalid.
  * @protected
  */
-Blockly.FieldImage.prototype.doClassValidation_ = function(opt_newValue) {
+FieldImage.prototype.doClassValidation_ = function(opt_newValue) {
   if (typeof opt_newValue != 'string') {
     return null;
   }
@@ -221,11 +223,11 @@ Blockly.FieldImage.prototype.doClassValidation_ = function(opt_newValue) {
  * that this is a string.
  * @protected
  */
-Blockly.FieldImage.prototype.doValueUpdate_ = function(newValue) {
+FieldImage.prototype.doValueUpdate_ = function(newValue) {
   this.value_ = newValue;
   if (this.imageElement_) {
-    this.imageElement_.setAttributeNS(Blockly.utils.dom.XLINK_NS,
-        'xlink:href', String(this.value_));
+    this.imageElement_.setAttributeNS(
+        XLINK_NS, 'xlink:href', String(this.value_));
   }
 };
 
@@ -234,7 +236,7 @@ Blockly.FieldImage.prototype.doValueUpdate_ = function(newValue) {
  * @return {boolean} True if we should flip in RTL.
  * @override
  */
-Blockly.FieldImage.prototype.getFlipRtl = function() {
+FieldImage.prototype.getFlipRtl = function() {
   return this.flipRtl_;
 };
 
@@ -243,7 +245,7 @@ Blockly.FieldImage.prototype.getFlipRtl = function() {
  * @param {?string} alt New alt text.
  * @public
  */
-Blockly.FieldImage.prototype.setAlt = function(alt) {
+FieldImage.prototype.setAlt = function(alt) {
   if (alt == this.altText_) {
     return;
   }
@@ -258,7 +260,7 @@ Blockly.FieldImage.prototype.setAlt = function(alt) {
  * call the handler.
  * @protected
  */
-Blockly.FieldImage.prototype.showEditor_ = function() {
+FieldImage.prototype.showEditor_ = function() {
   if (this.clickHandler_) {
     this.clickHandler_(this);
   }
@@ -266,10 +268,10 @@ Blockly.FieldImage.prototype.showEditor_ = function() {
 
 /**
  * Set the function that is called when this image  is clicked.
- * @param {?function(!Blockly.FieldImage)} func The function that is called
+ * @param {?function(!FieldImage)} func The function that is called
  *    when the image is clicked, or null to remove.
  */
-Blockly.FieldImage.prototype.setOnClickHandler = function(func) {
+FieldImage.prototype.setOnClickHandler = function(func) {
   this.clickHandler_ = func;
 };
 
@@ -281,8 +283,10 @@ Blockly.FieldImage.prototype.setOnClickHandler = function(func) {
  * @protected
  * @override
  */
-Blockly.FieldImage.prototype.getText_ = function() {
+FieldImage.prototype.getText_ = function() {
   return this.altText_;
 };
 
-Blockly.fieldRegistry.register('field_image', Blockly.FieldImage);
+fieldRegistry.register('field_image', FieldImage);
+
+exports = FieldImage;
diff --git a/core/field_label_serializable.js b/core/field_label_serializable.js
index 0201db130..daabaa59f 100644
--- a/core/field_label_serializable.js
+++ b/core/field_label_serializable.js
@@ -11,12 +11,13 @@
  */
 'use strict';
 
-goog.provide('Blockly.FieldLabelSerializable');
+goog.module('Blockly.FieldLabelSerializable');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.FieldLabel');
-goog.require('Blockly.fieldRegistry');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.object');
+const FieldLabel = goog.require('Blockly.FieldLabel');
+const fieldRegistry = goog.require('Blockly.fieldRegistry');
+const {inherits} = goog.require('Blockly.utils.object');
+const {replaceMessageReferences} = goog.require('Blockly.utils');
 
 
 /**
@@ -25,29 +26,29 @@ goog.require('Blockly.utils.object');
  *    string. Defaults to an empty string if null or undefined.
  * @param {string=} opt_class Optional CSS class for the field's text.
  * @param {Object=} opt_config A map of options used to configure the field.
- *    See the [field creation documentation]{@link https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/label-serializable#creation}
+ *    See the [field creation documentation]{@link
+ * https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/label-serializable#creation}
  *    for a list of properties this parameter supports.
- * @extends {Blockly.FieldLabel}
+ * @extends {FieldLabel}
  * @constructor
  *
  */
-Blockly.FieldLabelSerializable = function(opt_value, opt_class, opt_config) {
-  Blockly.FieldLabelSerializable.superClass_.constructor.call(
+const FieldLabelSerializable = function(opt_value, opt_class, opt_config) {
+  FieldLabelSerializable.superClass_.constructor.call(
       this, opt_value, opt_class, opt_config);
 };
-Blockly.utils.object.inherits(Blockly.FieldLabelSerializable,
-    Blockly.FieldLabel);
+inherits(FieldLabelSerializable, FieldLabel);
 
 /**
  * Construct a FieldLabelSerializable from a JSON arg object,
  * dereferencing any string table references.
  * @param {!Object} options A JSON object with options (text, and class).
- * @return {!Blockly.FieldLabelSerializable} The new field instance.
+ * @return {!FieldLabelSerializable} The new field instance.
  * @package
  * @nocollapse
  */
-Blockly.FieldLabelSerializable.fromJson = function(options) {
-  var text = Blockly.utils.replaceMessageReferences(options['text']);
+FieldLabelSerializable.fromJson = function(options) {
+  const text = replaceMessageReferences(options['text']);
   // `this` might be a subclass of FieldLabelSerializable if that class doesn't
   // override the static fromJson method.
   return new this(text, undefined, options);
@@ -58,14 +59,15 @@ Blockly.FieldLabelSerializable.fromJson = function(options) {
  * editable. This field should not.
  * @type {boolean}
  */
-Blockly.FieldLabelSerializable.prototype.EDITABLE = false;
+FieldLabelSerializable.prototype.EDITABLE = false;
 
 /**
  * Serializable fields are saved by the XML renderer, non-serializable fields
  * are not.  This field should be serialized, but only edited programmatically.
  * @type {boolean}
  */
-Blockly.FieldLabelSerializable.prototype.SERIALIZABLE = true;
+FieldLabelSerializable.prototype.SERIALIZABLE = true;
 
-Blockly.fieldRegistry.register(
-    'field_label_serializable', Blockly.FieldLabelSerializable);
+fieldRegistry.register('field_label_serializable', FieldLabelSerializable);
+
+exports = FieldLabelSerializable;
diff --git a/core/field_multilineinput.js b/core/field_multilineinput.js
index 887d4007f..4842429a5 100644
--- a/core/field_multilineinput.js
+++ b/core/field_multilineinput.js
@@ -12,20 +12,21 @@
  */
 'use strict';
 
-goog.provide('Blockly.FieldMultilineInput');
+goog.module('Blockly.FieldMultilineInput');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.Css');
-goog.require('Blockly.Field');
-goog.require('Blockly.fieldRegistry');
-goog.require('Blockly.FieldTextInput');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.aria');
-goog.require('Blockly.utils.dom');
-goog.require('Blockly.utils.KeyCodes');
-goog.require('Blockly.utils.object');
-goog.require('Blockly.utils.Svg');
-goog.require('Blockly.utils.userAgent');
-goog.require('Blockly.WidgetDiv');
+const Css = goog.require('Blockly.Css');
+const Field = goog.require('Blockly.Field');
+const FieldTextInput = goog.require('Blockly.FieldTextInput');
+const KeyCodes = goog.require('Blockly.utils.KeyCodes');
+const Svg = goog.require('Blockly.utils.Svg');
+const WidgetDiv = goog.require('Blockly.WidgetDiv');
+const aria = goog.require('Blockly.utils.aria');
+const dom = goog.require('Blockly.utils.dom');
+const fieldRegistry = goog.require('Blockly.fieldRegistry');
+const userAgent = goog.require('Blockly.utils.userAgent');
+const {inherits} = goog.require('Blockly.utils.object');
+const {replaceMessageReferences} = goog.require('Blockly.utils');
 
 
 /**
@@ -37,14 +38,15 @@ goog.require('Blockly.WidgetDiv');
  *     text as an argument and returns either the accepted text, a replacement
  *     text, or null to abort the change.
  * @param {Object=} opt_config A map of options used to configure the field.
- *    See the [field creation documentation]{@link https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/multiline-text-input#creation}
+ *    See the [field creation documentation]{@link
+ * https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/multiline-text-input#creation}
  *    for a list of properties this parameter supports.
- * @extends {Blockly.FieldTextInput}
+ * @extends {FieldTextInput}
  * @constructor
  */
-Blockly.FieldMultilineInput = function(opt_value, opt_validator, opt_config) {
-  Blockly.FieldMultilineInput.superClass_.constructor.call(this,
-      opt_value, opt_validator, opt_config);
+const FieldMultilineInput = function(opt_value, opt_validator, opt_config) {
+  FieldMultilineInput.superClass_.constructor.call(
+      this, opt_value, opt_validator, opt_config);
 
   /**
    * The SVG group element that will contain a text element for each text row
@@ -68,14 +70,13 @@ Blockly.FieldMultilineInput = function(opt_value, opt_validator, opt_config) {
    */
   this.isOverflowedY_ = false;
 };
-Blockly.utils.object.inherits(Blockly.FieldMultilineInput,
-    Blockly.FieldTextInput);
+inherits(FieldMultilineInput, FieldTextInput);
 
 /**
  * @override
  */
-Blockly.FieldMultilineInput.prototype.configure_ = function(config) {
-  Blockly.FieldMultilineInput.superClass_.configure_.call(this, config);
+FieldMultilineInput.prototype.configure_ = function(config) {
+  FieldMultilineInput.superClass_.configure_.call(this, config);
   config.maxLines && this.setMaxLines(config.maxLines);
 };
 
@@ -83,12 +84,12 @@ Blockly.FieldMultilineInput.prototype.configure_ = function(config) {
  * Construct a FieldMultilineInput from a JSON arg object,
  * dereferencing any string table references.
  * @param {!Object} options A JSON object with options (text, and spellcheck).
- * @return {!Blockly.FieldMultilineInput} The new field instance.
+ * @return {!FieldMultilineInput} The new field instance.
  * @package
  * @nocollapse
  */
-Blockly.FieldMultilineInput.fromJson = function(options) {
-  var text = Blockly.utils.replaceMessageReferences(options['text']);
+FieldMultilineInput.fromJson = function(options) {
+  const text = replaceMessageReferences(options['text']);
   // `this` might be a subclass of FieldMultilineInput if that class doesn't
   // override the static fromJson method.
   return new this(text, undefined, options);
@@ -101,7 +102,7 @@ Blockly.FieldMultilineInput.fromJson = function(options) {
  * @return {!Element} The element containing info about the field's state.
  * @package
  */
-Blockly.FieldMultilineInput.prototype.toXml = function(fieldElement) {
+FieldMultilineInput.prototype.toXml = function(fieldElement) {
   // Replace '\n' characters with HTML-escaped equivalent '&#10'. This is
   // needed so the plain-text representation of the XML produced by
   // `Blockly.Xml.domToText` will appear on a single line (this is a limitation
@@ -117,7 +118,7 @@ Blockly.FieldMultilineInput.prototype.toXml = function(fieldElement) {
  *    field's state.
  * @package
  */
-Blockly.FieldMultilineInput.prototype.fromXml = function(fieldElement) {
+FieldMultilineInput.prototype.fromXml = function(fieldElement) {
   this.setValue(fieldElement.textContent.replace(/&#10;/g, '\n'));
 };
 
@@ -125,12 +126,13 @@ Blockly.FieldMultilineInput.prototype.fromXml = function(fieldElement) {
  * Create the block UI for this field.
  * @package
  */
-Blockly.FieldMultilineInput.prototype.initView = function() {
+FieldMultilineInput.prototype.initView = function() {
   this.createBorderRect_();
-  this.textGroup_ = Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.G, {
+  this.textGroup_ = dom.createSvgElement(
+      Svg.G, {
         'class': 'blocklyEditableText',
-      }, this.fieldGroup_);
+      },
+      this.fieldGroup_);
 };
 
 /**
@@ -140,17 +142,18 @@ Blockly.FieldMultilineInput.prototype.initView = function() {
  * @protected
  * @override
  */
-Blockly.FieldMultilineInput.prototype.getDisplayText_ = function() {
-  var textLines = this.getText();
+FieldMultilineInput.prototype.getDisplayText_ = function() {
+  let textLines = this.getText();
   if (!textLines) {
     // Prevent the field from disappearing if empty.
-    return Blockly.Field.NBSP;
+    return Field.NBSP;
   }
-  var lines = textLines.split('\n');
+  const lines = textLines.split('\n');
   textLines = '';
-  var displayLinesNumber = this.isOverflowedY_ ? this.maxLines_ : lines.length;
-  for (var i = 0; i < displayLinesNumber; i++) {
-    var text = lines[i];
+  const displayLinesNumber =
+      this.isOverflowedY_ ? this.maxLines_ : lines.length;
+  for (let i = 0; i < displayLinesNumber; i++) {
+    let text = lines[i];
     if (text.length > this.maxDisplayLength) {
       // Truncate displayed string and add an ellipsis ('...').
       text = text.substring(0, this.maxDisplayLength - 4) + '...';
@@ -158,7 +161,7 @@ Blockly.FieldMultilineInput.prototype.getDisplayText_ = function() {
       text = text.substring(0, text.length - 3) + '...';
     }
     // Replace whitespace with non-breaking spaces so the text doesn't collapse.
-    text = text.replace(/\s/g, Blockly.Field.NBSP);
+    text = text.replace(/\s/g, Field.NBSP);
 
     textLines += text;
     if (i !== displayLinesNumber - 1) {
@@ -181,8 +184,8 @@ Blockly.FieldMultilineInput.prototype.getDisplayText_ = function() {
  * that this is a string.
  * @protected
  */
-Blockly.FieldMultilineInput.prototype.doValueUpdate_ = function(newValue) {
-  Blockly.FieldMultilineInput.superClass_.doValueUpdate_.call(this, newValue);
+FieldMultilineInput.prototype.doValueUpdate_ = function(newValue) {
+  FieldMultilineInput.superClass_.doValueUpdate_.call(this, newValue);
   this.isOverflowedY_ = this.value_.split('\n').length > this.maxLines_;
 };
 
@@ -190,36 +193,37 @@ Blockly.FieldMultilineInput.prototype.doValueUpdate_ = function(newValue) {
  * Updates the text of the textElement.
  * @protected
  */
-Blockly.FieldMultilineInput.prototype.render_ = function() {
+FieldMultilineInput.prototype.render_ = function() {
   // Remove all text group children.
-  var currentChild;
+  let currentChild;
   while ((currentChild = this.textGroup_.firstChild)) {
     this.textGroup_.removeChild(currentChild);
   }
 
   // Add in text elements into the group.
-  var lines = this.getDisplayText_().split('\n');
-  var y = 0;
-  for (var i = 0; i < lines.length; i++) {
-    var lineHeight = this.getConstants().FIELD_TEXT_HEIGHT +
+  const lines = this.getDisplayText_().split('\n');
+  let y = 0;
+  for (let i = 0; i < lines.length; i++) {
+    const lineHeight = this.getConstants().FIELD_TEXT_HEIGHT +
         this.getConstants().FIELD_BORDER_RECT_Y_PADDING;
-    var span = Blockly.utils.dom.createSvgElement(
-        Blockly.utils.Svg.TEXT, {
+    const span = dom.createSvgElement(
+        Svg.TEXT, {
           'class': 'blocklyText blocklyMultilineText',
           x: this.getConstants().FIELD_BORDER_RECT_X_PADDING,
           y: y + this.getConstants().FIELD_BORDER_RECT_Y_PADDING,
           dy: this.getConstants().FIELD_TEXT_BASELINE
-        }, this.textGroup_);
+        },
+        this.textGroup_);
     span.appendChild(document.createTextNode(lines[i]));
     y += lineHeight;
   }
 
   if (this.isBeingEdited_) {
-    var htmlInput = /** @type {!HTMLElement} */(this.htmlInput_);
+    var htmlInput = /** @type {!HTMLElement} */ (this.htmlInput_);
     if (this.isOverflowedY_) {
-      Blockly.utils.dom.addClass(htmlInput, 'blocklyHtmlTextAreaInputOverflowedY');
+      dom.addClass(htmlInput, 'blocklyHtmlTextAreaInputOverflowedY');
     } else {
-      Blockly.utils.dom.removeClass(htmlInput, 'blocklyHtmlTextAreaInputOverflowedY');
+      dom.removeClass(htmlInput, 'blocklyHtmlTextAreaInputOverflowedY');
     }
   }
 
@@ -234,15 +238,13 @@ Blockly.FieldMultilineInput.prototype.render_ = function() {
     } else {
       this.resizeEditor_();
     }
-    var htmlInput = /** @type {!HTMLElement} */(this.htmlInput_);
+    var htmlInput = /** @type {!HTMLElement} */ (this.htmlInput_);
     if (!this.isTextValid_) {
-      Blockly.utils.dom.addClass(htmlInput, 'blocklyInvalidInput');
-      Blockly.utils.aria.setState(htmlInput,
-          Blockly.utils.aria.State.INVALID, true);
+      dom.addClass(htmlInput, 'blocklyInvalidInput');
+      aria.setState(htmlInput, aria.State.INVALID, true);
     } else {
-      Blockly.utils.dom.removeClass(htmlInput, 'blocklyInvalidInput');
-      Blockly.utils.aria.setState(htmlInput,
-          Blockly.utils.aria.State.INVALID, false);
+      dom.removeClass(htmlInput, 'blocklyInvalidInput');
+      aria.setState(htmlInput, aria.State.INVALID, false);
     }
   }
 };
@@ -251,13 +253,13 @@ Blockly.FieldMultilineInput.prototype.render_ = function() {
  * Updates the size of the field based on the text.
  * @protected
  */
-Blockly.FieldMultilineInput.prototype.updateSize_ = function() {
-  var nodes = this.textGroup_.childNodes;
-  var totalWidth = 0;
-  var totalHeight = 0;
+FieldMultilineInput.prototype.updateSize_ = function() {
+  const nodes = this.textGroup_.childNodes;
+  let totalWidth = 0;
+  let totalHeight = 0;
   for (var i = 0; i < nodes.length; i++) {
-    var tspan = /** @type {!Element} */ (nodes[i]);
-    var textWidth = Blockly.utils.dom.getTextWidth(tspan);
+    const tspan = /** @type {!Element} */ (nodes[i]);
+    const textWidth = dom.getTextWidth(tspan);
     if (textWidth > totalWidth) {
       totalWidth = textWidth;
     }
@@ -270,26 +272,28 @@ Blockly.FieldMultilineInput.prototype.updateSize_ = function() {
     // absolute longest line, even if it would be truncated after editing.
     // Otherwise we would get wrong editor width when there are more
     // lines than this.maxLines_.
-    var actualEditorLines = this.value_.split('\n');
-    var dummyTextElement = Blockly.utils.dom.createSvgElement(
-        Blockly.utils.Svg.TEXT,{'class': 'blocklyText blocklyMultilineText'});
-    var fontSize = this.getConstants().FIELD_TEXT_FONTSIZE;
-    var fontWeight = this.getConstants().FIELD_TEXT_FONTWEIGHT;
-    var fontFamily = this.getConstants().FIELD_TEXT_FONTFAMILY;
+    const actualEditorLines = this.value_.split('\n');
+    const dummyTextElement = dom.createSvgElement(
+        Svg.TEXT, {'class': 'blocklyText blocklyMultilineText'});
+    const fontSize = this.getConstants().FIELD_TEXT_FONTSIZE;
+    const fontWeight = this.getConstants().FIELD_TEXT_FONTWEIGHT;
+    const fontFamily = this.getConstants().FIELD_TEXT_FONTFAMILY;
 
     for (var i = 0; i < actualEditorLines.length; i++) {
       if (actualEditorLines[i].length > this.maxDisplayLength) {
-        actualEditorLines[i] = actualEditorLines[i].substring(0, this.maxDisplayLength);
+        actualEditorLines[i] =
+            actualEditorLines[i].substring(0, this.maxDisplayLength);
       }
       dummyTextElement.textContent = actualEditorLines[i];
-      var lineWidth = Blockly.utils.dom.getFastTextWidth(
+      const lineWidth = dom.getFastTextWidth(
           dummyTextElement, fontSize, fontWeight, fontFamily);
       if (lineWidth > totalWidth) {
         totalWidth = lineWidth;
       }
     }
 
-    var scrollbarWidth = this.htmlInput_.offsetWidth - this.htmlInput_.clientWidth;
+    const scrollbarWidth =
+        this.htmlInput_.offsetWidth - this.htmlInput_.clientWidth;
     totalWidth += scrollbarWidth;
   }
   if (this.borderRect_) {
@@ -314,8 +318,9 @@ Blockly.FieldMultilineInput.prototype.updateSize_ = function() {
  *     focus.  Defaults to false.
  * @override
  */
-Blockly.FieldMultilineInput.prototype.showEditor_ = function(_opt_e, opt_quietInput) {
-  Blockly.FieldMultilineInput.superClass_.showEditor_.call(this, _opt_e, opt_quietInput);
+FieldMultilineInput.prototype.showEditor_ = function(_opt_e, opt_quietInput) {
+  FieldMultilineInput.superClass_.showEditor_.call(
+      this, _opt_e, opt_quietInput);
   this.forceRerender();
 };
 
@@ -324,24 +329,24 @@ Blockly.FieldMultilineInput.prototype.showEditor_ = function(_opt_e, opt_quietIn
  * @return {!HTMLTextAreaElement} The newly created text input editor.
  * @protected
  */
-Blockly.FieldMultilineInput.prototype.widgetCreate_ = function() {
-  var div = Blockly.WidgetDiv.DIV;
-  var scale = this.workspace_.getScale();
+FieldMultilineInput.prototype.widgetCreate_ = function() {
+  const div = WidgetDiv.DIV;
+  const scale = this.workspace_.getScale();
 
-  var htmlInput =
-    /** @type {HTMLTextAreaElement} */ (document.createElement('textarea'));
+  const htmlInput =
+      /** @type {HTMLTextAreaElement} */ (document.createElement('textarea'));
   htmlInput.className = 'blocklyHtmlInput blocklyHtmlTextAreaInput';
   htmlInput.setAttribute('spellcheck', this.spellcheck_);
-  var fontSize = (this.getConstants().FIELD_TEXT_FONTSIZE * scale) + 'pt';
+  const fontSize = (this.getConstants().FIELD_TEXT_FONTSIZE * scale) + 'pt';
   div.style.fontSize = fontSize;
   htmlInput.style.fontSize = fontSize;
-  var borderRadius = (Blockly.FieldTextInput.BORDERRADIUS * scale) + 'px';
+  const borderRadius = (FieldTextInput.BORDERRADIUS * scale) + 'px';
   htmlInput.style.borderRadius = borderRadius;
-  var paddingX = this.getConstants().FIELD_BORDER_RECT_X_PADDING * scale;
-  var paddingY = this.getConstants().FIELD_BORDER_RECT_Y_PADDING * scale / 2;
-  htmlInput.style.padding = paddingY + 'px ' + paddingX + 'px ' + paddingY +
-      'px ' + paddingX + 'px';
-  var lineHeight = this.getConstants().FIELD_TEXT_HEIGHT +
+  const paddingX = this.getConstants().FIELD_BORDER_RECT_X_PADDING * scale;
+  const paddingY = this.getConstants().FIELD_BORDER_RECT_Y_PADDING * scale / 2;
+  htmlInput.style.padding =
+      paddingY + 'px ' + paddingX + 'px ' + paddingY + 'px ' + paddingX + 'px';
+  const lineHeight = this.getConstants().FIELD_TEXT_HEIGHT +
       this.getConstants().FIELD_BORDER_RECT_Y_PADDING;
   htmlInput.style.lineHeight = (lineHeight * scale) + 'px';
 
@@ -350,7 +355,7 @@ Blockly.FieldMultilineInput.prototype.widgetCreate_ = function() {
   htmlInput.value = htmlInput.defaultValue = this.getEditorText_(this.value_);
   htmlInput.untypedDefaultValue_ = this.value_;
   htmlInput.oldValue_ = null;
-  if (Blockly.utils.userAgent.GECKO) {
+  if (userAgent.GECKO) {
     // In FF, ensure the browser reflows before resizing to avoid issue #2777.
     setTimeout(this.resizeEditor_.bind(this), 0);
   } else {
@@ -367,8 +372,9 @@ Blockly.FieldMultilineInput.prototype.widgetCreate_ = function() {
  * @param {number} maxLines Defines the maximum number of lines allowed,
  *     before scrolling functionality is enabled.
  */
-Blockly.FieldMultilineInput.prototype.setMaxLines = function(maxLines) {
-  if (typeof maxLines === 'number' && maxLines > 0 && maxLines !== this.maxLines_) {
+FieldMultilineInput.prototype.setMaxLines = function(maxLines) {
+  if (typeof maxLines === 'number' && maxLines > 0 &&
+      maxLines !== this.maxLines_) {
     this.maxLines_ = maxLines;
     this.forceRerender();
   }
@@ -378,7 +384,7 @@ Blockly.FieldMultilineInput.prototype.setMaxLines = function(maxLines) {
  * Returns the maxLines config of this field.
  * @return {number} The maxLines config value.
  */
-Blockly.FieldMultilineInput.prototype.getMaxLines = function() {
+FieldMultilineInput.prototype.getMaxLines = function() {
   return this.maxLines_;
 };
 
@@ -388,29 +394,29 @@ Blockly.FieldMultilineInput.prototype.getMaxLines = function() {
  * @param {!Event} e Keyboard event.
  * @protected
  */
-Blockly.FieldMultilineInput.prototype.onHtmlInputKeyDown_ = function(e) {
-  if (e.keyCode !== Blockly.utils.KeyCodes.ENTER) {
-    Blockly.FieldMultilineInput.superClass_.onHtmlInputKeyDown_.call(this, e);
+FieldMultilineInput.prototype.onHtmlInputKeyDown_ = function(e) {
+  if (e.keyCode !== KeyCodes.ENTER) {
+    FieldMultilineInput.superClass_.onHtmlInputKeyDown_.call(this, e);
   }
 };
 
 /**
  * CSS for multiline field.  See css.js for use.
  */
-Blockly.Css.register([
-  /* eslint-disable indent */
-  '.blocklyHtmlTextAreaInput {',
-    'font-family: monospace;',
-    'resize: none;',
-    'overflow: hidden;',
-    'height: 100%;',
-    'text-align: left;',
-  '}',
-  '.blocklyHtmlTextAreaInputOverflowedY {',
-    'overflow-y: scroll;',
-  '}'
-  /* eslint-enable indent */
+Css.register([
+  `.blocklyHtmlTextAreaInput {
+  font-family: monospace;
+  resize: none;
+  overflow: hidden;
+  height: 100%;
+  text-align: left;
+}`,
+  `.blocklyHtmlTextAreaInputOverflowedY {
+  overflow-y: scroll;
+}`
 ]);
 
 
-Blockly.fieldRegistry.register('field_multilinetext', Blockly.FieldMultilineInput);
+fieldRegistry.register('field_multilinetext', FieldMultilineInput);
+
+exports = FieldMultilineInput;
diff --git a/core/field_registry.js b/core/field_registry.js
index 7f431ff7d..97c149346 100644
--- a/core/field_registry.js
+++ b/core/field_registry.js
@@ -12,56 +12,62 @@
  */
 'use strict';
 
-goog.provide('Blockly.fieldRegistry');
+goog.module('Blockly.fieldRegistry');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.registry');
-
-goog.requireType('Blockly.Field');
-goog.requireType('Blockly.IRegistrableField');
+/* eslint-disable-next-line no-unused-vars */
+const Field = goog.requireType('Blockly.Field');
+/* eslint-disable-next-line no-unused-vars */
+const IRegistrableField = goog.requireType('Blockly.IRegistrableField');
+const registry = goog.require('Blockly.registry');
 
 
 /**
  * Registers a field type.
- * Blockly.fieldRegistry.fromJson uses this registry to
+ * fieldRegistry.fromJson uses this registry to
  * find the appropriate field type.
  * @param {string} type The field type name as used in the JSON definition.
- * @param {!Blockly.IRegistrableField} fieldClass The field class containing a
+ * @param {!IRegistrableField} fieldClass The field class containing a
  *     fromJson function that can construct an instance of the field.
  * @throws {Error} if the type name is empty, the field is already
  *     registered, or the fieldClass is not an object containing a fromJson
  *     function.
  */
-Blockly.fieldRegistry.register = function(type, fieldClass) {
-  Blockly.registry.register(Blockly.registry.Type.FIELD, type, fieldClass);
+const register = function(type, fieldClass) {
+  registry.register(registry.Type.FIELD, type, fieldClass);
 };
+exports.register = register;
 
 /**
  * Unregisters the field registered with the given type.
  * @param {string} type The field type name as used in the JSON definition.
  */
-Blockly.fieldRegistry.unregister = function(type) {
-  Blockly.registry.unregister(Blockly.registry.Type.FIELD, type);
+const unregister = function(type) {
+  registry.unregister(registry.Type.FIELD, type);
 };
+exports.unregister = unregister;
 
 /**
  * Construct a Field from a JSON arg object.
  * Finds the appropriate registered field by the type name as registered using
- * Blockly.fieldRegistry.register.
+ * fieldRegistry.register.
  * @param {!Object} options A JSON object with a type and options specific
  *     to the field type.
- * @return {?Blockly.Field} The new field instance or null if a field wasn't
+ * @return {?Field} The new field instance or null if a field wasn't
  *     found with the given type name
- * @package
  */
-Blockly.fieldRegistry.fromJson = function(options) {
-  var fieldObject = /** @type {?Blockly.IRegistrableField} */ (
-    Blockly.registry.getObject(Blockly.registry.Type.FIELD, options['type']));
+const fromJson = function(options) {
+  const fieldObject = /** @type {?IRegistrableField} */ (
+      registry.getObject(registry.Type.FIELD, options['type']));
   if (!fieldObject) {
-    console.warn('Blockly could not create a field of type ' + options['type'] +
-      '. The field is probably not being registered. This could be because' +
-      ' the file is not loaded, the field does not register itself (Issue' +
-      ' #1584), or the registration is not being reached.');
+    console.warn(
+        'Blockly could not create a field of type ' + options['type'] +
+        '. The field is probably not being registered. This could be because' +
+        ' the file is not loaded, the field does not register itself (Issue' +
+        ' #1584), or the registration is not being reached.');
     return null;
   }
   return fieldObject.fromJson(options);
 };
+/** @package */
+exports.fromJson = fromJson;
diff --git a/core/field_variable.js b/core/field_variable.js
index e5e379c13..f700d4a99 100644
--- a/core/field_variable.js
+++ b/core/field_variable.js
@@ -10,24 +10,24 @@
  */
 'use strict';
 
-goog.provide('Blockly.FieldVariable');
+goog.module('Blockly.FieldVariable');
+goog.module.declareLegacyNamespace();
 
+const Block = goog.requireType('Blockly.Block');
+const FieldDropdown = goog.require('Blockly.FieldDropdown');
+const Menu = goog.requireType('Blockly.Menu');
+const MenuItem = goog.requireType('Blockly.MenuItem');
+const Msg = goog.require('Blockly.Msg');
+const Size = goog.require('Blockly.utils.Size');
+const VariableModel = goog.require('Blockly.VariableModel');
+const Variables = goog.require('Blockly.Variables');
+const Xml = goog.require('Blockly.Xml');
+const fieldRegistry = goog.require('Blockly.fieldRegistry');
+const internalConstants = goog.require('Blockly.internalConstants');
+const {inherits} = goog.require('Blockly.utils.object');
+const {replaceMessageReferences} = goog.require('Blockly.utils');
 /** @suppress {extraRequire} */
 goog.require('Blockly.Events.BlockChange');
-goog.require('Blockly.FieldDropdown');
-goog.require('Blockly.fieldRegistry');
-goog.require('Blockly.internalConstants');
-goog.require('Blockly.Msg');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.object');
-goog.require('Blockly.utils.Size');
-goog.require('Blockly.VariableModel');
-goog.require('Blockly.Variables');
-goog.require('Blockly.Xml');
-
-goog.requireType('Blockly.Block');
-goog.requireType('Blockly.Menu');
-goog.requireType('Blockly.MenuItem');
 
 
 /**
@@ -42,13 +42,14 @@ goog.requireType('Blockly.MenuItem');
  * @param {string=} opt_defaultType The type of variable to create if this
  *     field's value is not explicitly set.  Defaults to ''.
  * @param {Object=} opt_config A map of options used to configure the field.
- *    See the [field creation documentation]{@link https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/variable#creation}
+ *    See the [field creation documentation]{@link
+ *    https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/variable#creation}
  *    for a list of properties this parameter supports.
- * @extends {Blockly.FieldDropdown}
+ * @extends {FieldDropdown}
  * @constructor
  */
-Blockly.FieldVariable = function(varName, opt_validator, opt_variableTypes,
-    opt_defaultType, opt_config) {
+const FieldVariable = function(
+    varName, opt_validator, opt_variableTypes, opt_defaultType, opt_config) {
   // The FieldDropdown constructor expects the field's initial value to be
   // the first entry in the menu generator, which it may or may not be.
   // Just do the relevant parts of the constructor.
@@ -57,10 +58,10 @@ Blockly.FieldVariable = function(varName, opt_validator, opt_variableTypes,
    * An array of options for a dropdown list,
    * or a function which generates these options.
    * @type {(!Array<!Array>|
-   *    !function(this:Blockly.FieldDropdown): !Array<!Array>)}
+   *    !function(this:FieldDropdown): !Array<!Array>)}
    * @protected
    */
-  this.menuGenerator_ = Blockly.FieldVariable.dropdownCreate;
+  this.menuGenerator_ = FieldVariable.dropdownCreate;
 
   /**
    * The initial variable name passed to this field's constructor, or an
@@ -72,11 +73,11 @@ Blockly.FieldVariable = function(varName, opt_validator, opt_variableTypes,
 
   /**
    * The size of the area rendered by the field.
-   * @type {Blockly.utils.Size}
+   * @type {Size}
    * @protected
    * @override
    */
-  this.size_ = new Blockly.utils.Size(0, 0);
+  this.size_ = new Size(0, 0);
 
   opt_config && this.configure_(opt_config);
   opt_validator && this.setValidator(opt_validator);
@@ -85,19 +86,19 @@ Blockly.FieldVariable = function(varName, opt_validator, opt_variableTypes,
     this.setTypes_(opt_variableTypes, opt_defaultType);
   }
 };
-Blockly.utils.object.inherits(Blockly.FieldVariable, Blockly.FieldDropdown);
+inherits(FieldVariable, FieldDropdown);
 
 /**
  * Construct a FieldVariable from a JSON arg object,
  * dereferencing any string table references.
  * @param {!Object} options A JSON object with options (variable,
  *                          variableTypes, and defaultType).
- * @return {!Blockly.FieldVariable} The new field instance.
+ * @return {!FieldVariable} The new field instance.
  * @package
  * @nocollapse
  */
-Blockly.FieldVariable.fromJson = function(options) {
-  var varName = Blockly.utils.replaceMessageReferences(options['variable']);
+FieldVariable.fromJson = function(options) {
+  const varName = replaceMessageReferences(options['variable']);
   // `this` might be a subclass of FieldVariable if that class doesn't override
   // the static fromJson method.
   return new this(varName, undefined, undefined, undefined, options);
@@ -108,15 +109,15 @@ Blockly.FieldVariable.fromJson = function(options) {
  * are not. Editable fields should also be serializable.
  * @type {boolean}
  */
-Blockly.FieldVariable.prototype.SERIALIZABLE = true;
+FieldVariable.prototype.SERIALIZABLE = true;
 
 /**
  * Configure the field based on the given map of options.
  * @param {!Object} config A map of options to configure the field based on.
  * @protected
  */
-Blockly.FieldVariable.prototype.configure_ = function(config) {
-  Blockly.FieldVariable.superClass_.configure_.call(this, config);
+FieldVariable.prototype.configure_ = function(config) {
+  FieldVariable.superClass_.configure_.call(this, config);
   this.setTypes_(config['variableTypes'], config['defaultType']);
 };
 
@@ -126,13 +127,13 @@ Blockly.FieldVariable.prototype.configure_ = function(config) {
  * variable rather than let the value be invalid.
  * @package
  */
-Blockly.FieldVariable.prototype.initModel = function() {
+FieldVariable.prototype.initModel = function() {
   if (this.variable_) {
     return;  // Initialization already happened.
   }
-  var variable = Blockly.Variables.getOrCreateVariablePackage(
-      this.sourceBlock_.workspace, null,
-      this.defaultVariableName, this.defaultType_);
+  const variable = Variables.getOrCreateVariablePackage(
+      this.sourceBlock_.workspace, null, this.defaultVariableName,
+      this.defaultType_);
 
   // Don't call setValue because we don't want to cause a rerender.
   this.doValueUpdate_(variable.getId());
@@ -141,10 +142,10 @@ Blockly.FieldVariable.prototype.initModel = function() {
 /**
  * @override
  */
-Blockly.FieldVariable.prototype.shouldAddBorderRect_ = function() {
-  return Blockly.FieldVariable.superClass_.shouldAddBorderRect_.call(this) &&
-    (!this.getConstants().FIELD_DROPDOWN_NO_BORDER_RECT_SHADOW ||
-        this.sourceBlock_.type != 'variables_get');
+FieldVariable.prototype.shouldAddBorderRect_ = function() {
+  return FieldVariable.superClass_.shouldAddBorderRect_.call(this) &&
+      (!this.getConstants().FIELD_DROPDOWN_NO_BORDER_RECT_SHADOW ||
+       this.sourceBlock_.type != 'variables_get');
 };
 
 /**
@@ -152,23 +153,24 @@ Blockly.FieldVariable.prototype.shouldAddBorderRect_ = function() {
  * @param {!Element} fieldElement The element containing information about the
  *    variable field's state.
  */
-Blockly.FieldVariable.prototype.fromXml = function(fieldElement) {
-  var id = fieldElement.getAttribute('id');
-  var variableName = fieldElement.textContent;
+FieldVariable.prototype.fromXml = function(fieldElement) {
+  const id = fieldElement.getAttribute('id');
+  const variableName = fieldElement.textContent;
   // 'variabletype' should be lowercase, but until July 2019 it was sometimes
   // recorded as 'variableType'.  Thus we need to check for both.
-  var variableType = fieldElement.getAttribute('variabletype') ||
+  const variableType = fieldElement.getAttribute('variabletype') ||
       fieldElement.getAttribute('variableType') || '';
 
-  var variable = Blockly.Variables.getOrCreateVariablePackage(
+  const variable = Variables.getOrCreateVariablePackage(
       this.sourceBlock_.workspace, id, variableName, variableType);
 
   // This should never happen :)
   if (variableType != null && variableType !== variable.type) {
-    throw Error('Serialized variable type with id \'' +
-      variable.getId() + '\' had type ' + variable.type + ', and ' +
-      'does not match variable field that references it: ' +
-      Blockly.Xml.domToText(fieldElement) + '.');
+    throw Error(
+        'Serialized variable type with id \'' + variable.getId() +
+        '\' had type ' + variable.type + ', and ' +
+        'does not match variable field that references it: ' +
+        Xml.domToText(fieldElement) + '.');
   }
 
   this.setValue(variable.getId());
@@ -180,7 +182,7 @@ Blockly.FieldVariable.prototype.fromXml = function(fieldElement) {
  *    field's state.
  * @return {!Element} The element containing info about the field's state.
  */
-Blockly.FieldVariable.prototype.toXml = function(fieldElement) {
+FieldVariable.prototype.toXml = function(fieldElement) {
   // Make sure the variable is initialized.
   this.initModel();
 
@@ -194,20 +196,20 @@ Blockly.FieldVariable.prototype.toXml = function(fieldElement) {
 
 /**
  * Attach this field to a block.
- * @param {!Blockly.Block} block The block containing this field.
+ * @param {!Block} block The block containing this field.
  */
-Blockly.FieldVariable.prototype.setSourceBlock = function(block) {
+FieldVariable.prototype.setSourceBlock = function(block) {
   if (block.isShadow()) {
     throw Error('Variable fields are not allowed to exist on shadow blocks.');
   }
-  Blockly.FieldVariable.superClass_.setSourceBlock.call(this, block);
+  FieldVariable.superClass_.setSourceBlock.call(this, block);
 };
 
 /**
  * Get the variable's ID.
  * @return {string} Current variable's ID.
  */
-Blockly.FieldVariable.prototype.getValue = function() {
+FieldVariable.prototype.getValue = function() {
   return this.variable_ ? this.variable_.getId() : null;
 };
 
@@ -216,7 +218,7 @@ Blockly.FieldVariable.prototype.getValue = function() {
  * @return {string} The selected variable's name, or the empty string if no
  *     variable is selected.
  */
-Blockly.FieldVariable.prototype.getText = function() {
+FieldVariable.prototype.getText = function() {
   return this.variable_ ? this.variable_.name : '';
 };
 
@@ -224,11 +226,11 @@ Blockly.FieldVariable.prototype.getText = function() {
  * Get the variable model for the selected variable.
  * Not guaranteed to be in the variable map on the workspace (e.g. if accessed
  * after the variable has been deleted).
- * @return {?Blockly.VariableModel} The selected variable, or null if none was
+ * @return {?VariableModel} The selected variable, or null if none was
  *     selected.
  * @package
  */
-Blockly.FieldVariable.prototype.getVariable = function() {
+FieldVariable.prototype.getVariable = function() {
   return this.variable_;
 };
 
@@ -239,7 +241,7 @@ Blockly.FieldVariable.prototype.getVariable = function() {
  * a block and workspace at that point.
  * @return {?Function} Validation function, or null.
  */
-Blockly.FieldVariable.prototype.getValidator = function() {
+FieldVariable.prototype.getValidator = function() {
   // Validators shouldn't operate on the initial setValue call.
   // Normally this is achieved by calling setValidator after setValue, but
   // this is not a possibility with variable fields.
@@ -255,20 +257,20 @@ Blockly.FieldVariable.prototype.getValidator = function() {
  * @return {?string} The validated ID, or null if invalid.
  * @protected
  */
-Blockly.FieldVariable.prototype.doClassValidation_ = function(opt_newValue) {
+FieldVariable.prototype.doClassValidation_ = function(opt_newValue) {
   if (opt_newValue === null) {
     return null;
   }
-  var newId = /** @type {string} */ (opt_newValue);
-  var variable = Blockly.Variables.getVariable(
-      this.sourceBlock_.workspace, newId);
+  const newId = /** @type {string} */ (opt_newValue);
+  const variable = Variables.getVariable(this.sourceBlock_.workspace, newId);
   if (!variable) {
-    console.warn('Variable id doesn\'t point to a real variable! ' +
+    console.warn(
+        'Variable id doesn\'t point to a real variable! ' +
         'ID was ' + newId);
     return null;
   }
   // Type Checks.
-  var type = variable.type;
+  const type = variable.type;
   if (!this.typeIsAllowed_(type)) {
     console.warn('Variable type doesn\'t match this field!  Type was ' + type);
     return null;
@@ -284,10 +286,10 @@ Blockly.FieldVariable.prototype.doClassValidation_ = function(opt_newValue) {
  * @param {*} newId The value to be saved.
  * @protected
  */
-Blockly.FieldVariable.prototype.doValueUpdate_ = function(newId) {
-  this.variable_ = Blockly.Variables.getVariable(
+FieldVariable.prototype.doValueUpdate_ = function(newId) {
+  this.variable_ = Variables.getVariable(
       this.sourceBlock_.workspace, /** @type {string} */ (newId));
-  Blockly.FieldVariable.superClass_.doValueUpdate_.call(this, newId);
+  FieldVariable.superClass_.doValueUpdate_.call(this, newId);
 };
 
 /**
@@ -296,12 +298,12 @@ Blockly.FieldVariable.prototype.doValueUpdate_ = function(newId) {
  * @return {boolean} True if the type is in the list of allowed types.
  * @private
  */
-Blockly.FieldVariable.prototype.typeIsAllowed_ = function(type) {
-  var typeList = this.getVariableTypes_();
+FieldVariable.prototype.typeIsAllowed_ = function(type) {
+  const typeList = this.getVariableTypes_();
   if (!typeList) {
     return true;  // If it's null, all types are valid.
   }
-  for (var i = 0; i < typeList.length; i++) {
+  for (let i = 0; i < typeList.length; i++) {
     if (type == typeList[i]) {
       return true;
     }
@@ -315,9 +317,9 @@ Blockly.FieldVariable.prototype.typeIsAllowed_ = function(type) {
  * @throws {Error} if variableTypes is an empty array.
  * @private
  */
-Blockly.FieldVariable.prototype.getVariableTypes_ = function() {
+FieldVariable.prototype.getVariableTypes_ = function() {
   // TODO (#1513): Try to avoid calling this every time the field is edited.
-  var variableTypes = this.variableTypes;
+  let variableTypes = this.variableTypes;
   if (variableTypes === null) {
     // If variableTypes is null, return all variable types.
     if (this.sourceBlock_ && this.sourceBlock_.workspace) {
@@ -327,9 +329,9 @@ Blockly.FieldVariable.prototype.getVariableTypes_ = function() {
   variableTypes = variableTypes || [''];
   if (variableTypes.length == 0) {
     // Throw an error if variableTypes is an empty list.
-    var name = this.getText();
-    throw Error('\'variableTypes\' of field variable ' +
-      name + ' was an empty list');
+    const name = this.getText();
+    throw Error(
+        '\'variableTypes\' of field variable ' + name + ' was an empty list');
   }
   return variableTypes;
 };
@@ -344,29 +346,32 @@ Blockly.FieldVariable.prototype.getVariableTypes_ = function() {
  *     field's value is not explicitly set.  Defaults to ''.
  * @private
  */
-Blockly.FieldVariable.prototype.setTypes_ = function(opt_variableTypes,
-    opt_defaultType) {
+FieldVariable.prototype.setTypes_ = function(
+    opt_variableTypes, opt_defaultType) {
   // If you expected that the default type would be the same as the only entry
   // in the variable types array, tell the Blockly team by commenting on #1499.
-  var defaultType = opt_defaultType || '';
+  const defaultType = opt_defaultType || '';
+  let variableTypes;
   // Set the allowable variable types.  Null means all types on the workspace.
   if (opt_variableTypes == null || opt_variableTypes == undefined) {
-    var variableTypes = null;
+    variableTypes = null;
   } else if (Array.isArray(opt_variableTypes)) {
-    var variableTypes = opt_variableTypes;
+    variableTypes = opt_variableTypes;
     // Make sure the default type is valid.
-    var isInArray = false;
-    for (var i = 0; i < variableTypes.length; i++) {
+    let isInArray = false;
+    for (let i = 0; i < variableTypes.length; i++) {
       if (variableTypes[i] == defaultType) {
         isInArray = true;
       }
     }
     if (!isInArray) {
-      throw Error('Invalid default type \'' + defaultType + '\' in ' +
+      throw Error(
+          'Invalid default type \'' + defaultType + '\' in ' +
           'the definition of a FieldVariable');
     }
   } else {
-    throw Error('\'variableTypes\' was not an array in the definition of ' +
+    throw Error(
+        '\'variableTypes\' was not an array in the definition of ' +
         'a FieldVariable');
   }
   // Only update the field once all checks pass.
@@ -380,7 +385,7 @@ Blockly.FieldVariable.prototype.setTypes_ = function(opt_variableTypes,
  * be called by the block.
  * @package
  */
-Blockly.FieldVariable.prototype.refreshVariableName = function() {
+FieldVariable.prototype.refreshVariableName = function() {
   this.forceRerender();
 };
 
@@ -388,40 +393,39 @@ Blockly.FieldVariable.prototype.refreshVariableName = function() {
  * Return a sorted list of variable names for variable dropdown menus.
  * Include a special option at the end for creating a new variable name.
  * @return {!Array<!Array>} Array of variable names/id tuples.
- * @this {Blockly.FieldVariable}
+ * @this {FieldVariable}
  */
-Blockly.FieldVariable.dropdownCreate = function() {
+FieldVariable.dropdownCreate = function() {
   if (!this.variable_) {
-    throw Error('Tried to call dropdownCreate on a variable field with no' +
+    throw Error(
+        'Tried to call dropdownCreate on a variable field with no' +
         ' variable selected.');
   }
-  var name = this.getText();
-  var variableModelList = [];
+  const name = this.getText();
+  let variableModelList = [];
   if (this.sourceBlock_ && this.sourceBlock_.workspace) {
-    var variableTypes = this.getVariableTypes_();
+    const variableTypes = this.getVariableTypes_();
     // Get a copy of the list, so that adding rename and new variable options
     // doesn't modify the workspace's list.
-    for (var i = 0; i < variableTypes.length; i++) {
-      var variableType = variableTypes[i];
-      var variables =
-        this.sourceBlock_.workspace.getVariablesOfType(variableType);
+    for (let i = 0; i < variableTypes.length; i++) {
+      const variableType = variableTypes[i];
+      const variables =
+          this.sourceBlock_.workspace.getVariablesOfType(variableType);
       variableModelList = variableModelList.concat(variables);
     }
   }
-  variableModelList.sort(Blockly.VariableModel.compareByName);
+  variableModelList.sort(VariableModel.compareByName);
 
-  var options = [];
-  for (var i = 0; i < variableModelList.length; i++) {
+  const options = [];
+  for (let i = 0; i < variableModelList.length; i++) {
     // Set the UUID as the internal representation of the variable.
     options[i] = [variableModelList[i].name, variableModelList[i].getId()];
   }
-  options.push([
-    Blockly.Msg['RENAME_VARIABLE'], Blockly.internalConstants.RENAME_VARIABLE_ID
-  ]);
-  if (Blockly.Msg['DELETE_VARIABLE']) {
+  options.push([Msg['RENAME_VARIABLE'], internalConstants.RENAME_VARIABLE_ID]);
+  if (Msg['DELETE_VARIABLE']) {
     options.push([
-      Blockly.Msg['DELETE_VARIABLE'].replace('%1', name),
-      Blockly.internalConstants.DELETE_VARIABLE_ID
+      Msg['DELETE_VARIABLE'].replace('%1', name),
+      internalConstants.DELETE_VARIABLE_ID
     ]);
   }
 
@@ -432,20 +436,19 @@ Blockly.FieldVariable.dropdownCreate = function() {
  * Handle the selection of an item in the variable dropdown menu.
  * Special case the 'Rename variable...' and 'Delete variable...' options.
  * In the rename case, prompt the user for a new name.
- * @param {!Blockly.Menu} menu The Menu component clicked.
- * @param {!Blockly.MenuItem} menuItem The MenuItem selected within menu.
+ * @param {!Menu} menu The Menu component clicked.
+ * @param {!MenuItem} menuItem The MenuItem selected within menu.
  * @protected
  */
-Blockly.FieldVariable.prototype.onItemSelected_ = function(menu, menuItem) {
-  var id = menuItem.getValue();
+FieldVariable.prototype.onItemSelected_ = function(menu, menuItem) {
+  const id = menuItem.getValue();
   // Handle special cases.
   if (this.sourceBlock_ && this.sourceBlock_.workspace) {
-    if (id == Blockly.internalConstants.RENAME_VARIABLE_ID) {
+    if (id == internalConstants.RENAME_VARIABLE_ID) {
       // Rename variable.
-      Blockly.Variables.renameVariable(
-          this.sourceBlock_.workspace, this.variable_);
+      Variables.renameVariable(this.sourceBlock_.workspace, this.variable_);
       return;
-    } else if (id == Blockly.internalConstants.DELETE_VARIABLE_ID) {
+    } else if (id == internalConstants.DELETE_VARIABLE_ID) {
       // Delete variable.
       this.sourceBlock_.workspace.deleteVariableById(this.variable_.getId());
       return;
@@ -461,8 +464,10 @@ Blockly.FieldVariable.prototype.onItemSelected_ = function(menu, menuItem) {
  * @package
  * @override
  */
-Blockly.FieldVariable.prototype.referencesVariables = function() {
+FieldVariable.prototype.referencesVariables = function() {
   return true;
 };
 
-Blockly.fieldRegistry.register('field_variable', Blockly.FieldVariable);
+fieldRegistry.register('field_variable', FieldVariable);
+
+exports = FieldVariable;
diff --git a/core/flyout_horizontal.js b/core/flyout_horizontal.js
index 66e9ff18e..7f1ad72fd 100644
--- a/core/flyout_horizontal.js
+++ b/core/flyout_horizontal.js
@@ -10,36 +10,36 @@
  */
 'use strict';
 
-goog.provide('Blockly.HorizontalFlyout');
+goog.module('Blockly.HorizontalFlyout');
+goog.module.declareLegacyNamespace();
 
-/** @suppress {extraRequire} */
-goog.require('Blockly.Block');
-goog.require('Blockly.DropDownDiv');
-goog.require('Blockly.Flyout');
-goog.require('Blockly.registry');
-goog.require('Blockly.Scrollbar');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.object');
-goog.require('Blockly.utils.Rect');
-goog.require('Blockly.utils.toolbox');
-goog.require('Blockly.WidgetDiv');
-
-goog.requireType('Blockly.Options');
-goog.requireType('Blockly.utils.Coordinate');
+/* eslint-disable-next-line no-unused-vars */
+const Coordinate = goog.requireType('Blockly.utils.Coordinate');
+const DropDownDiv = goog.require('Blockly.DropDownDiv');
+const Flyout = goog.require('Blockly.Flyout');
+/* eslint-disable-next-line no-unused-vars */
+const Options = goog.requireType('Blockly.Options');
+const Rect = goog.require('Blockly.utils.Rect');
+const Scrollbar = goog.require('Blockly.Scrollbar');
+const WidgetDiv = goog.require('Blockly.WidgetDiv');
+const registry = goog.require('Blockly.registry');
+const {Position} = goog.require('Blockly.utils.toolbox');
+const {getScrollDeltaPixels} = goog.require('Blockly.utils');
+const {inherits} = goog.require('Blockly.utils.object');
 
 
 /**
  * Class for a flyout.
- * @param {!Blockly.Options} workspaceOptions Dictionary of options for the
+ * @param {!Options} workspaceOptions Dictionary of options for the
  *     workspace.
- * @extends {Blockly.Flyout}
+ * @extends {Flyout}
  * @constructor
  */
-Blockly.HorizontalFlyout = function(workspaceOptions) {
-  Blockly.HorizontalFlyout.superClass_.constructor.call(this, workspaceOptions);
+const HorizontalFlyout = function(workspaceOptions) {
+  HorizontalFlyout.superClass_.constructor.call(this, workspaceOptions);
   this.horizontalLayout = true;
 };
-Blockly.utils.object.inherits(Blockly.HorizontalFlyout, Blockly.Flyout);
+inherits(HorizontalFlyout, Flyout);
 
 /**
  * Sets the translation of the flyout to match the scrollbars.
@@ -48,23 +48,24 @@ Blockly.utils.object.inherits(Blockly.HorizontalFlyout, Blockly.Flyout);
  *     similar x property.
  * @protected
  */
-Blockly.HorizontalFlyout.prototype.setMetrics_ = function(xyRatio) {
+HorizontalFlyout.prototype.setMetrics_ = function(xyRatio) {
   if (!this.isVisible()) {
     return;
   }
 
-  var metricsManager = this.workspace_.getMetricsManager();
-  var scrollMetrics = metricsManager.getScrollMetrics();
-  var viewMetrics = metricsManager.getViewMetrics();
-  var absoluteMetrics = metricsManager.getAbsoluteMetrics();
+  const metricsManager = this.workspace_.getMetricsManager();
+  const scrollMetrics = metricsManager.getScrollMetrics();
+  const viewMetrics = metricsManager.getViewMetrics();
+  const absoluteMetrics = metricsManager.getAbsoluteMetrics();
 
   if (typeof xyRatio.x == 'number') {
     this.workspace_.scrollX =
         -(scrollMetrics.left +
-            (scrollMetrics.width - viewMetrics.width) * xyRatio.x);
+          (scrollMetrics.width - viewMetrics.width) * xyRatio.x);
   }
 
-  this.workspace_.translate(this.workspace_.scrollX + absoluteMetrics.left,
+  this.workspace_.translate(
+      this.workspace_.scrollX + absoluteMetrics.left,
       this.workspace_.scrollY + absoluteMetrics.top);
 };
 
@@ -72,7 +73,7 @@ Blockly.HorizontalFlyout.prototype.setMetrics_ = function(xyRatio) {
  * Calculates the x coordinate for the flyout position.
  * @return {number} X coordinate.
  */
-Blockly.HorizontalFlyout.prototype.getX = function() {
+HorizontalFlyout.prototype.getX = function() {
   // X is always 0 since this is a horizontal flyout.
   return 0;
 };
@@ -81,17 +82,17 @@ Blockly.HorizontalFlyout.prototype.getX = function() {
  * Calculates the y coordinate for the flyout position.
  * @return {number} Y coordinate.
  */
-Blockly.HorizontalFlyout.prototype.getY = function() {
+HorizontalFlyout.prototype.getY = function() {
   if (!this.isVisible()) {
     return 0;
   }
-  var metricsManager = this.targetWorkspace.getMetricsManager();
-  var absoluteMetrics = metricsManager.getAbsoluteMetrics();
-  var viewMetrics = metricsManager.getViewMetrics();
-  var toolboxMetrics = metricsManager.getToolboxMetrics();
+  const metricsManager = this.targetWorkspace.getMetricsManager();
+  const absoluteMetrics = metricsManager.getAbsoluteMetrics();
+  const viewMetrics = metricsManager.getViewMetrics();
+  const toolboxMetrics = metricsManager.getToolboxMetrics();
 
-  var y = 0;
-  var atTop = this.toolboxPosition_ == Blockly.utils.toolbox.Position.TOP;
+  let y = 0;
+  const atTop = this.toolboxPosition_ == Position.TOP;
   // If this flyout is not the trashcan flyout (e.g. toolbox or mutator).
   if (this.targetWorkspace.toolboxPosition == this.toolboxPosition_) {
     // If there is a category toolbox.
@@ -129,22 +130,22 @@ Blockly.HorizontalFlyout.prototype.getY = function() {
 /**
  * Move the flyout to the edge of the workspace.
  */
-Blockly.HorizontalFlyout.prototype.position = function() {
+HorizontalFlyout.prototype.position = function() {
   if (!this.isVisible() || !this.targetWorkspace.isVisible()) {
     return;
   }
-  var metricsManager = this.targetWorkspace.getMetricsManager();
-  var targetWorkspaceViewMetrics = metricsManager.getViewMetrics();
+  const metricsManager = this.targetWorkspace.getMetricsManager();
+  const targetWorkspaceViewMetrics = metricsManager.getViewMetrics();
 
   // Record the width for workspace metrics.
   this.width_ = targetWorkspaceViewMetrics.width;
 
-  var edgeWidth = targetWorkspaceViewMetrics.width - 2 * this.CORNER_RADIUS;
-  var edgeHeight = this.height_ - this.CORNER_RADIUS;
+  const edgeWidth = targetWorkspaceViewMetrics.width - 2 * this.CORNER_RADIUS;
+  const edgeHeight = this.height_ - this.CORNER_RADIUS;
   this.setBackgroundPath_(edgeWidth, edgeHeight);
 
-  var x = this.getX();
-  var y = this.getY();
+  const x = this.getX();
+  const y = this.getY();
 
   this.positionAt_(this.width_, this.height_, x, y);
 };
@@ -157,11 +158,10 @@ Blockly.HorizontalFlyout.prototype.position = function() {
  *     rounded corners.
  * @private
  */
-Blockly.HorizontalFlyout.prototype.setBackgroundPath_ = function(
-    width, height) {
-  var atTop = this.toolboxPosition_ == Blockly.utils.toolbox.Position.TOP;
+HorizontalFlyout.prototype.setBackgroundPath_ = function(width, height) {
+  const atTop = this.toolboxPosition_ == Position.TOP;
   // Start at top left.
-  var path = ['M 0,' + (atTop ? 0 : this.CORNER_RADIUS)];
+  const path = ['M 0,' + (atTop ? 0 : this.CORNER_RADIUS)];
 
   if (atTop) {
     // Top.
@@ -169,20 +169,24 @@ Blockly.HorizontalFlyout.prototype.setBackgroundPath_ = function(
     // Right.
     path.push('v', height);
     // Bottom.
-    path.push('a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
+    path.push(
+        'a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
         -this.CORNER_RADIUS, this.CORNER_RADIUS);
     path.push('h', -width);
     // Left.
-    path.push('a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
+    path.push(
+        'a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
         -this.CORNER_RADIUS, -this.CORNER_RADIUS);
     path.push('z');
   } else {
     // Top.
-    path.push('a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
+    path.push(
+        'a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
         this.CORNER_RADIUS, -this.CORNER_RADIUS);
     path.push('h', width);
     // Right.
-    path.push('a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
+    path.push(
+        'a', this.CORNER_RADIUS, this.CORNER_RADIUS, 0, 0, 1,
         this.CORNER_RADIUS, this.CORNER_RADIUS);
     path.push('v', height);
     // Bottom.
@@ -196,7 +200,7 @@ Blockly.HorizontalFlyout.prototype.setBackgroundPath_ = function(
 /**
  * Scroll the flyout to the top.
  */
-Blockly.HorizontalFlyout.prototype.scrollToStart = function() {
+HorizontalFlyout.prototype.scrollToStart = function() {
   this.workspace_.scrollbar.setX(this.RTL ? Infinity : 0);
 };
 
@@ -205,20 +209,20 @@ Blockly.HorizontalFlyout.prototype.scrollToStart = function() {
  * @param {!Event} e Mouse wheel scroll event.
  * @protected
  */
-Blockly.HorizontalFlyout.prototype.wheel_ = function(e) {
-  var scrollDelta = Blockly.utils.getScrollDeltaPixels(e);
-  var delta = scrollDelta.x || scrollDelta.y;
+HorizontalFlyout.prototype.wheel_ = function(e) {
+  const scrollDelta = getScrollDeltaPixels(e);
+  const delta = scrollDelta.x || scrollDelta.y;
 
   if (delta) {
-    var metricsManager = this.workspace_.getMetricsManager();
-    var scrollMetrics = metricsManager.getScrollMetrics();
-    var viewMetrics = metricsManager.getViewMetrics();
+    const metricsManager = this.workspace_.getMetricsManager();
+    const scrollMetrics = metricsManager.getScrollMetrics();
+    const viewMetrics = metricsManager.getViewMetrics();
 
-    var pos = (viewMetrics.left - scrollMetrics.left) + delta;
+    const pos = (viewMetrics.left - scrollMetrics.left) + delta;
     this.workspace_.scrollbar.setX(pos);
     // When the flyout moves from a wheel event, hide WidgetDiv and DropDownDiv.
-    Blockly.WidgetDiv.hide();
-    Blockly.DropDownDiv.hideWithoutAnimation();
+    WidgetDiv.hide();
+    DropDownDiv.hideWithoutAnimation();
   }
 
   // Don't scroll the page.
@@ -233,39 +237,40 @@ Blockly.HorizontalFlyout.prototype.wheel_ = function(e) {
  * @param {!Array<number>} gaps The visible gaps between blocks.
  * @protected
  */
-Blockly.HorizontalFlyout.prototype.layout_ = function(contents, gaps) {
+HorizontalFlyout.prototype.layout_ = function(contents, gaps) {
   this.workspace_.scale = this.targetWorkspace.scale;
-  var margin = this.MARGIN;
-  var cursorX = margin + this.tabWidth_;
-  var cursorY = margin;
+  const margin = this.MARGIN;
+  let cursorX = margin + this.tabWidth_;
+  const cursorY = margin;
   if (this.RTL) {
     contents = contents.reverse();
   }
 
-  for (var i = 0, item; (item = contents[i]); i++) {
+  for (let i = 0, item; (item = contents[i]); i++) {
     if (item.type == 'block') {
-      var block = item.block;
-      var allBlocks = block.getDescendants(false);
-      for (var j = 0, child; (child = allBlocks[j]); j++) {
+      const block = item.block;
+      const allBlocks = block.getDescendants(false);
+      for (let j = 0, child; (child = allBlocks[j]); j++) {
         // Mark blocks as being inside a flyout.  This is used to detect and
         // prevent the closure of the flyout if the user right-clicks on such a
         // block.
         child.isInFlyout = true;
       }
       block.render();
-      var root = block.getSvgRoot();
-      var blockHW = block.getHeightWidth();
+      const root = block.getSvgRoot();
+      const blockHW = block.getHeightWidth();
 
       // Figure out where to place the block.
-      var tab = block.outputConnection ? this.tabWidth_ : 0;
+      const tab = block.outputConnection ? this.tabWidth_ : 0;
+      let moveX;
       if (this.RTL) {
-        var moveX = cursorX + blockHW.width;
+        moveX = cursorX + blockHW.width;
       } else {
-        var moveX = cursorX - tab;
+        moveX = cursorX - tab;
       }
       block.moveBy(moveX, cursorY);
 
-      var rect = this.createRect_(block, moveX, cursorY, blockHW, i);
+      const rect = this.createRect_(block, moveX, cursorY, blockHW, i);
       cursorX += (blockHW.width + gaps[i]);
 
       this.addBlockListeners_(root, block, rect);
@@ -280,19 +285,19 @@ Blockly.HorizontalFlyout.prototype.layout_ = function(contents, gaps) {
  * Determine if a drag delta is toward the workspace, based on the position
  * and orientation of the flyout. This is used in determineDragIntention_ to
  * determine if a new block should be created or if the flyout should scroll.
- * @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
+ * @param {!Coordinate} currentDragDeltaXY How far the pointer has
  *     moved from the position at mouse down, in pixel units.
  * @return {boolean} True if the drag is toward the workspace.
  * @package
  */
-Blockly.HorizontalFlyout.prototype.isDragTowardWorkspace = function(
+HorizontalFlyout.prototype.isDragTowardWorkspace = function(
     currentDragDeltaXY) {
-  var dx = currentDragDeltaXY.x;
-  var dy = currentDragDeltaXY.y;
+  const dx = currentDragDeltaXY.x;
+  const dy = currentDragDeltaXY.y;
   // Direction goes from -180 to 180, with 0 toward the right and 90 on top.
-  var dragDirection = Math.atan2(dy, dx) / Math.PI * 180;
+  const dragDirection = Math.atan2(dy, dx) / Math.PI * 180;
 
-  var range = this.dragAngleRange_;
+  const range = this.dragAngleRange_;
   // Check for up or down dragging.
   if ((dragDirection < 90 + range && dragDirection > 90 - range) ||
       (dragDirection > -90 - range && dragDirection < -90 + range)) {
@@ -304,28 +309,28 @@ Blockly.HorizontalFlyout.prototype.isDragTowardWorkspace = function(
 /**
  * Returns the bounding rectangle of the drag target area in pixel units
  * relative to viewport.
- * @return {?Blockly.utils.Rect} The component's bounding box. Null if drag
+ * @return {?Rect} The component's bounding box. Null if drag
  *   target area should be ignored.
  */
-Blockly.HorizontalFlyout.prototype.getClientRect = function() {
+HorizontalFlyout.prototype.getClientRect = function() {
   if (!this.svgGroup_ || this.autoClose || !this.isVisible()) {
     // The bounding rectangle won't compute correctly if the flyout is closed
     // and auto-close flyouts aren't valid drag targets (or delete areas).
     return null;
   }
 
-  var flyoutRect = this.svgGroup_.getBoundingClientRect();
+  const flyoutRect = this.svgGroup_.getBoundingClientRect();
   // BIG_NUM is offscreen padding so that blocks dragged beyond the shown flyout
   // area are still deleted.  Must be larger than the largest screen size,
   // but be smaller than half Number.MAX_SAFE_INTEGER (not available on IE).
-  var BIG_NUM = 1000000000;
-  var top = flyoutRect.top;
+  const BIG_NUM = 1000000000;
+  const top = flyoutRect.top;
 
-  if (this.toolboxPosition_ == Blockly.utils.toolbox.Position.TOP) {
-    var height = flyoutRect.height;
-    return new Blockly.utils.Rect(-BIG_NUM, top + height, -BIG_NUM, BIG_NUM);
+  if (this.toolboxPosition_ == Position.TOP) {
+    const height = flyoutRect.height;
+    return new Rect(-BIG_NUM, top + height, -BIG_NUM, BIG_NUM);
   } else {  // Bottom.
-    return new Blockly.utils.Rect(top, BIG_NUM, -BIG_NUM, BIG_NUM);
+    return new Rect(top, BIG_NUM, -BIG_NUM, BIG_NUM);
   }
 };
 
@@ -334,36 +339,37 @@ Blockly.HorizontalFlyout.prototype.getClientRect = function() {
  * For RTL: Lay out the blocks right-aligned.
  * @protected
  */
-Blockly.HorizontalFlyout.prototype.reflowInternal_ = function() {
+HorizontalFlyout.prototype.reflowInternal_ = function() {
   this.workspace_.scale = this.getFlyoutScale();
-  var flyoutHeight = 0;
-  var blocks = this.workspace_.getTopBlocks(false);
-  for (var i = 0, block; (block = blocks[i]); i++) {
+  let flyoutHeight = 0;
+  const blocks = this.workspace_.getTopBlocks(false);
+  for (let i = 0, block; (block = blocks[i]); i++) {
     flyoutHeight = Math.max(flyoutHeight, block.getHeightWidth().height);
   }
-  var buttons = this.buttons_;
-  for (var i = 0, button; (button = buttons[i]); i++) {
+  const buttons = this.buttons_;
+  for (let i = 0, button; (button = buttons[i]); i++) {
     flyoutHeight = Math.max(flyoutHeight, button.height);
   }
   flyoutHeight += this.MARGIN * 1.5;
   flyoutHeight *= this.workspace_.scale;
-  flyoutHeight += Blockly.Scrollbar.scrollbarThickness;
+  flyoutHeight += Scrollbar.scrollbarThickness;
 
   if (this.height_ != flyoutHeight) {
-    for (var i = 0, block; (block = blocks[i]); i++) {
+    for (let i = 0, block; (block = blocks[i]); i++) {
       if (block.flyoutRect_) {
         this.moveRectToBlock_(block.flyoutRect_, block);
       }
     }
 
     if (this.targetWorkspace.toolboxPosition == this.toolboxPosition_ &&
-        this.toolboxPosition_ == Blockly.utils.toolbox.Position.TOP &&
+        this.toolboxPosition_ == Position.TOP &&
         !this.targetWorkspace.getToolbox()) {
       // This flyout is a simple toolbox. Reposition the workspace so that (0,0)
       // is in the correct position relative to the new absolute edge (ie
       // toolbox edge).
       this.targetWorkspace.translate(
-          this.targetWorkspace.scrollX, this.targetWorkspace.scrollY + flyoutHeight);
+          this.targetWorkspace.scrollX,
+          this.targetWorkspace.scrollY + flyoutHeight);
     }
 
     // Record the height for workspace metrics and .position.
@@ -373,5 +379,8 @@ Blockly.HorizontalFlyout.prototype.reflowInternal_ = function() {
   }
 };
 
-Blockly.registry.register(Blockly.registry.Type.FLYOUTS_HORIZONTAL_TOOLBOX,
-    Blockly.registry.DEFAULT, Blockly.HorizontalFlyout);
+registry.register(
+    registry.Type.FLYOUTS_HORIZONTAL_TOOLBOX, registry.DEFAULT,
+    HorizontalFlyout);
+
+exports = HorizontalFlyout;
diff --git a/core/generator.js b/core/generator.js
index e365c69ba..112c2f8a1 100644
--- a/core/generator.js
+++ b/core/generator.js
@@ -11,14 +11,18 @@
  */
 'use strict';
 
-goog.provide('Blockly.Generator');
+goog.module('Blockly.Generator');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.Block');
-goog.require('Blockly.internalConstants');
-goog.require('Blockly.utils.deprecation');
-
-goog.requireType('Blockly.Names');
-goog.requireType('Blockly.Workspace');
+/* eslint-disable-next-line no-unused-vars */
+const Block = goog.requireType('Blockly.Block');
+/* eslint-disable-next-line no-unused-vars */
+const Names = goog.requireType('Blockly.Names');
+/* eslint-disable-next-line no-unused-vars */
+const Workspace = goog.requireType('Blockly.Workspace');
+const internalConstants = goog.require('Blockly.internalConstants');
+const deprecation = goog.require('Blockly.utils.deprecation');
+const {getMainWorkspace} = goog.require('Blockly');
 
 
 /**
@@ -26,7 +30,7 @@ goog.requireType('Blockly.Workspace');
  * @param {string} name Language name of this generator.
  * @constructor
  */
-Blockly.Generator = function(name) {
+const Generator = function(name) {
   this.name_ = name;
   this.FUNCTION_NAME_PLACEHOLDER_REGEXP_ =
       new RegExp(this.FUNCTION_NAME_PLACEHOLDER_, 'g');
@@ -38,7 +42,7 @@ Blockly.Generator = function(name) {
  * E.g. '  checkTimeout(%1);\n'
  * @type {?string}
  */
-Blockly.Generator.prototype.INFINITE_LOOP_TRAP = null;
+Generator.prototype.INFINITE_LOOP_TRAP = null;
 
 /**
  * Arbitrary code to inject before every statement.
@@ -46,7 +50,7 @@ Blockly.Generator.prototype.INFINITE_LOOP_TRAP = null;
  * E.g. 'highlight(%1);\n'
  * @type {?string}
  */
-Blockly.Generator.prototype.STATEMENT_PREFIX = null;
+Generator.prototype.STATEMENT_PREFIX = null;
 
 /**
  * Arbitrary code to inject after every statement.
@@ -54,27 +58,27 @@ Blockly.Generator.prototype.STATEMENT_PREFIX = null;
  * E.g. 'highlight(%1);\n'
  * @type {?string}
  */
-Blockly.Generator.prototype.STATEMENT_SUFFIX = null;
+Generator.prototype.STATEMENT_SUFFIX = null;
 
 /**
  * The method of indenting.  Defaults to two spaces, but language generators
  * may override this to increase indent or change to tabs.
  * @type {string}
  */
-Blockly.Generator.prototype.INDENT = '  ';
+Generator.prototype.INDENT = '  ';
 
 /**
  * Maximum length for a comment before wrapping.  Does not account for
  * indenting level.
  * @type {number}
  */
-Blockly.Generator.prototype.COMMENT_WRAP = 60;
+Generator.prototype.COMMENT_WRAP = 60;
 
 /**
  * List of outer-inner pairings that do NOT require parentheses.
  * @type {!Array<!Array<number>>}
  */
-Blockly.Generator.prototype.ORDER_OVERRIDES = [];
+Generator.prototype.ORDER_OVERRIDES = [];
 
 /**
  * Whether the init method has been called.
@@ -83,24 +87,24 @@ Blockly.Generator.prototype.ORDER_OVERRIDES = [];
  * initialized. If this flag is untouched, it will have no effect.
  * @type {?boolean}
  */
-Blockly.Generator.prototype.isInitialized = null;
+Generator.prototype.isInitialized = null;
 
 /**
  * Generate code for all blocks in the workspace to the specified language.
- * @param {!Blockly.Workspace=} workspace Workspace to generate code from.
+ * @param {!Workspace=} workspace Workspace to generate code from.
  * @return {string} Generated code.
  */
-Blockly.Generator.prototype.workspaceToCode = function(workspace) {
+Generator.prototype.workspaceToCode = function(workspace) {
   if (!workspace) {
     // Backwards compatibility from before there could be multiple workspaces.
     console.warn('No workspace specified in workspaceToCode call.  Guessing.');
-    workspace = Blockly.getMainWorkspace();
+    workspace = getMainWorkspace();
   }
-  var code = [];
+  let code = [];
   this.init(workspace);
-  var blocks = workspace.getTopBlocks(true);
-  for (var i = 0, block; (block = blocks[i]); i++) {
-    var line = this.blockToCode(block);
+  const blocks = workspace.getTopBlocks(true);
+  for (let i = 0, block; (block = blocks[i]); i++) {
+    let line = this.blockToCode(block);
     if (Array.isArray(line)) {
       // Value blocks return tuples of code and operator order.
       // Top-level blocks don't care about operator order.
@@ -140,20 +144,20 @@ Blockly.Generator.prototype.workspaceToCode = function(workspace) {
  * @param {string} prefix The common prefix.
  * @return {string} The prefixed lines of code.
  */
-Blockly.Generator.prototype.prefixLines = function(text, prefix) {
+Generator.prototype.prefixLines = function(text, prefix) {
   return prefix + text.replace(/(?!\n$)\n/g, '\n' + prefix);
 };
 
 /**
  * Recursively spider a tree of blocks, returning all their comments.
- * @param {!Blockly.Block} block The block from which to start spidering.
+ * @param {!Block} block The block from which to start spidering.
  * @return {string} Concatenated list of comments.
  */
-Blockly.Generator.prototype.allNestedComments = function(block) {
-  var comments = [];
-  var blocks = block.getDescendants(true);
-  for (var i = 0; i < blocks.length; i++) {
-    var comment = blocks[i].getCommentText();
+Generator.prototype.allNestedComments = function(block) {
+  const comments = [];
+  const blocks = block.getDescendants(true);
+  for (let i = 0; i < blocks.length; i++) {
+    const comment = blocks[i].getCommentText();
     if (comment) {
       comments.push(comment);
     }
@@ -168,13 +172,13 @@ Blockly.Generator.prototype.allNestedComments = function(block) {
 /**
  * Generate code for the specified block (and attached blocks).
  * The generator must be initialized before calling this function.
- * @param {Blockly.Block} block The block to generate code for.
+ * @param {Block} block The block to generate code for.
  * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string|!Array} For statement blocks, the generated code.
  *     For value blocks, an array containing the generated code and an
  *     operator order value.  Returns '' if block is null.
  */
-Blockly.Generator.prototype.blockToCode = function(block, opt_thisOnly) {
+Generator.prototype.blockToCode = function(block, opt_thisOnly) {
   if (this.isInitialized === false) {
     console.warn(
         'Generator init was not called before blockToCode was called.');
@@ -191,16 +195,17 @@ Blockly.Generator.prototype.blockToCode = function(block, opt_thisOnly) {
     return opt_thisOnly ? '' : this.blockToCode(block.getChildren(false)[0]);
   }
 
-  var func = this[block.type];
+  const func = this[block.type];
   if (typeof func != 'function') {
-    throw Error('Language "' + this.name_ + '" does not know how to generate ' +
+    throw Error(
+        'Language "' + this.name_ + '" does not know how to generate ' +
         'code for block type "' + block.type + '".');
   }
   // First argument to func.call is the value of 'this' in the generator.
   // Prior to 24 September 2013 'this' was the only way to access the block.
   // The current preferred method of accessing the block is through the second
   // argument to func.call, which becomes the first parameter to the generator.
-  var code = func.call(block, block);
+  let code = func.call(block, block);
   if (Array.isArray(code)) {
     // Value blocks return tuples of code and operator order.
     if (!block.outputConnection) {
@@ -224,22 +229,22 @@ Blockly.Generator.prototype.blockToCode = function(block, opt_thisOnly) {
 
 /**
  * Generate code representing the specified value input.
- * @param {!Blockly.Block} block The block containing the input.
+ * @param {!Block} block The block containing the input.
  * @param {string} name The name of the input.
  * @param {number} outerOrder The maximum binding strength (minimum order value)
  *     of any operators adjacent to "block".
  * @return {string} Generated code or '' if no blocks are connected or the
  *     specified input does not exist.
  */
-Blockly.Generator.prototype.valueToCode = function(block, name, outerOrder) {
+Generator.prototype.valueToCode = function(block, name, outerOrder) {
   if (isNaN(outerOrder)) {
     throw TypeError('Expecting valid order from block: ' + block.type);
   }
-  var targetBlock = block.getInputTargetBlock(name);
+  const targetBlock = block.getInputTargetBlock(name);
   if (!targetBlock) {
     return '';
   }
-  var tuple = this.blockToCode(targetBlock);
+  const tuple = this.blockToCode(targetBlock);
   if (tuple === '') {
     // Disabled block.
     return '';
@@ -249,20 +254,20 @@ Blockly.Generator.prototype.valueToCode = function(block, name, outerOrder) {
   if (!Array.isArray(tuple)) {
     throw TypeError('Expecting tuple from value block: ' + targetBlock.type);
   }
-  var code = tuple[0];
-  var innerOrder = tuple[1];
+  let code = tuple[0];
+  const innerOrder = tuple[1];
   if (isNaN(innerOrder)) {
-    throw TypeError('Expecting valid order from value block: ' +
-        targetBlock.type);
+    throw TypeError(
+        'Expecting valid order from value block: ' + targetBlock.type);
   }
   if (!code) {
     return '';
   }
 
   // Add parentheses if needed.
-  var parensNeeded = false;
-  var outerOrderClass = Math.floor(outerOrder);
-  var innerOrderClass = Math.floor(innerOrder);
+  let parensNeeded = false;
+  const outerOrderClass = Math.floor(outerOrder);
+  const innerOrderClass = Math.floor(innerOrder);
   if (outerOrderClass <= innerOrderClass) {
     if (outerOrderClass == innerOrderClass &&
         (outerOrderClass == 0 || outerOrderClass == 99)) {
@@ -276,7 +281,7 @@ Blockly.Generator.prototype.valueToCode = function(block, name, outerOrder) {
       // wrap the code in parentheses.
       parensNeeded = true;
       // Check for special exceptions.
-      for (var i = 0; i < this.ORDER_OVERRIDES.length; i++) {
+      for (let i = 0; i < this.ORDER_OVERRIDES.length; i++) {
         if (this.ORDER_OVERRIDES[i][0] == outerOrder &&
             this.ORDER_OVERRIDES[i][1] == innerOrder) {
           parensNeeded = false;
@@ -298,17 +303,18 @@ Blockly.Generator.prototype.valueToCode = function(block, name, outerOrder) {
  * statement input. Indent the code.
  * This is mainly used in generators. When trying to generate code to evaluate
  * look at using workspaceToCode or blockToCode.
- * @param {!Blockly.Block} block The block containing the input.
+ * @param {!Block} block The block containing the input.
  * @param {string} name The name of the input.
  * @return {string} Generated code or '' if no blocks are connected.
  */
-Blockly.Generator.prototype.statementToCode = function(block, name) {
-  var targetBlock = block.getInputTargetBlock(name);
-  var code = this.blockToCode(targetBlock);
+Generator.prototype.statementToCode = function(block, name) {
+  const targetBlock = block.getInputTargetBlock(name);
+  let code = this.blockToCode(targetBlock);
   // Value blocks must return code and order of operations info.
   // Statement blocks must only return code.
   if (typeof code != 'string') {
-    throw TypeError('Expecting code from statement block: ' +
+    throw TypeError(
+        'Expecting code from statement block: ' +
         (targetBlock && targetBlock.type));
   }
   if (code) {
@@ -323,21 +329,24 @@ Blockly.Generator.prototype.statementToCode = function(block, name) {
  * statement executes), and a statement prefix to the end of the loop block
  * (right before the loop statement executes).
  * @param {string} branch Code for loop contents.
- * @param {!Blockly.Block} block Enclosing block.
+ * @param {!Block} block Enclosing block.
  * @return {string} Loop contents, with infinite loop trap added.
  */
-Blockly.Generator.prototype.addLoopTrap = function(branch, block) {
+Generator.prototype.addLoopTrap = function(branch, block) {
   if (this.INFINITE_LOOP_TRAP) {
-    branch = this.prefixLines(this.injectId(this.INFINITE_LOOP_TRAP, block),
-        this.INDENT) + branch;
+    branch = this.prefixLines(
+                 this.injectId(this.INFINITE_LOOP_TRAP, block), this.INDENT) +
+        branch;
   }
   if (this.STATEMENT_SUFFIX && !block.suppressPrefixSuffix) {
-    branch = this.prefixLines(this.injectId(this.STATEMENT_SUFFIX, block),
-        this.INDENT) + branch;
+    branch = this.prefixLines(
+                 this.injectId(this.STATEMENT_SUFFIX, block), this.INDENT) +
+        branch;
   }
   if (this.STATEMENT_PREFIX && !block.suppressPrefixSuffix) {
-    branch = branch + this.prefixLines(this.injectId(this.STATEMENT_PREFIX,
-        block), this.INDENT);
+    branch = branch +
+        this.prefixLines(
+            this.injectId(this.STATEMENT_PREFIX, block), this.INDENT);
   }
   return branch;
 };
@@ -346,11 +355,11 @@ Blockly.Generator.prototype.addLoopTrap = function(branch, block) {
  * Inject a block ID into a message to replace '%1'.
  * Used for STATEMENT_PREFIX, STATEMENT_SUFFIX, and INFINITE_LOOP_TRAP.
  * @param {string} msg Code snippet with '%1'.
- * @param {!Blockly.Block} block Block which has an ID.
+ * @param {!Block} block Block which has an ID.
  * @return {string} Code snippet with ID.
  */
-Blockly.Generator.prototype.injectId = function(msg, block) {
-  var id = block.id.replace(/\$/g, '$$$$');  // Issue 251.
+Generator.prototype.injectId = function(msg, block) {
+  const id = block.id.replace(/\$/g, '$$$$');  // Issue 251.
   return msg.replace(/%1/g, '\'' + id + '\'');
 };
 
@@ -359,33 +368,33 @@ Blockly.Generator.prototype.injectId = function(msg, block) {
  * @type {string}
  * @protected
  */
-Blockly.Generator.prototype.RESERVED_WORDS_ = '';
+Generator.prototype.RESERVED_WORDS_ = '';
 
 /**
  * Add one or more words to the list of reserved words for this language.
  * @param {string} words Comma-separated list of words to add to the list.
  *     No spaces.  Duplicates are ok.
  */
-Blockly.Generator.prototype.addReservedWords = function(words) {
+Generator.prototype.addReservedWords = function(words) {
   this.RESERVED_WORDS_ += words + ',';
 };
 
 /**
  * This is used as a placeholder in functions defined using
- * Blockly.Generator.provideFunction_.  It must not be legal code that could
+ * Generator.provideFunction_.  It must not be legal code that could
  * legitimately appear in a function definition (or comment), and it must
  * not confuse the regular expression parser.
  * @type {string}
  * @protected
  */
-Blockly.Generator.prototype.FUNCTION_NAME_PLACEHOLDER_ = '{leCUI8hutHZI4480Dc}';
+Generator.prototype.FUNCTION_NAME_PLACEHOLDER_ = '{leCUI8hutHZI4480Dc}';
 
 /**
  * A dictionary of definitions to be printed before the code.
  * @type {!Object|undefined}
  * @protected
  */
-Blockly.Generator.prototype.definitions_;
+Generator.prototype.definitions_;
 
 /**
  * A dictionary mapping desired function names in definitions_ to actual
@@ -393,36 +402,34 @@ Blockly.Generator.prototype.definitions_;
  * @type {!Object|undefined}
  * @protected
  */
-Blockly.Generator.prototype.functionNames_;
+Generator.prototype.functionNames_;
 
 /**
  * A database of variable and procedure names.
- * @type {!Blockly.Names|undefined}
+ * @type {!Names|undefined}
  * @protected
  */
-Blockly.Generator.prototype.nameDB_;
+Generator.prototype.nameDB_;
 
-Object.defineProperty(Blockly.Generator.prototype, 'variableDB_', {
+Object.defineProperty(Generator.prototype, 'variableDB_', {
   /**
    * Getter.
    * @deprecated 'variableDB_' was renamed to 'nameDB_' (May 2021).
-   * @this {Blockly.Generator}
-   * @return {!Blockly.Names|undefined} Name database.
+   * @this {Generator}
+   * @return {!Names|undefined} Name database.
    */
   get: function() {
-    Blockly.utils.deprecation.warn(
-        'variableDB_', 'May 2021', 'May 2026', 'nameDB_');
+    deprecation.warn('variableDB_', 'May 2021', 'May 2026', 'nameDB_');
     return this.nameDB_;
   },
   /**
    * Setter.
    * @deprecated 'variableDB_' was renamed to 'nameDB_' (May 2021).
-   * @this {Blockly.Generator}
-   * @param {!Blockly.Names|undefined} nameDb New name database.
+   * @this {Generator}
+   * @param {!Names|undefined} nameDb New name database.
    */
   set: function(nameDb) {
-    Blockly.utils.deprecation.warn(
-        'variableDB_', 'May 2021', 'May 2026', 'nameDB_');
+    deprecation.warn('variableDB_', 'May 2021', 'May 2026', 'nameDB_');
     this.nameDB_ = nameDb;
   }
 });
@@ -439,7 +446,7 @@ Object.defineProperty(Blockly.Generator.prototype, 'variableDB_', {
  * "listRandom", not "random").  There is no danger of colliding with reserved
  * words, or user-defined variable or procedure names.
  *
- * The code gets output when Blockly.Generator.finish() is called.
+ * The code gets output when Generator.finish() is called.
  *
  * @param {string} desiredName The desired name of the function
  *     (e.g. mathIsPrime).
@@ -448,18 +455,18 @@ Object.defineProperty(Blockly.Generator.prototype, 'variableDB_', {
  *     from desiredName if the former has already been taken by the user.
  * @protected
  */
-Blockly.Generator.prototype.provideFunction_ = function(desiredName, code) {
+Generator.prototype.provideFunction_ = function(desiredName, code) {
   if (!this.definitions_[desiredName]) {
-    var functionName = this.nameDB_.getDistinctName(
-        desiredName, Blockly.internalConstants.PROCEDURE_CATEGORY_NAME);
+    const functionName = this.nameDB_.getDistinctName(
+        desiredName, internalConstants.PROCEDURE_CATEGORY_NAME);
     this.functionNames_[desiredName] = functionName;
-    var codeText = code.join('\n').replace(
+    let codeText = code.join('\n').replace(
         this.FUNCTION_NAME_PLACEHOLDER_REGEXP_, functionName);
     // Change all '  ' indents into the desired indent.
     // To avoid an infinite loop of replacements, change all indents to '\0'
     // character first, then replace them all with the indent.
     // We are assuming that no provided functions contain a literal null char.
-    var oldCodeText;
+    let oldCodeText;
     while (oldCodeText != codeText) {
       oldCodeText = codeText;
       codeText = codeText.replace(/^(( {2})*) {2}/gm, '$1\0');
@@ -474,9 +481,9 @@ Blockly.Generator.prototype.provideFunction_ = function(desiredName, code) {
  * Hook for code to run before code generation starts.
  * Subclasses may override this, e.g. to initialise the database of variable
  * names.
- * @param {!Blockly.Workspace} _workspace Workspace to generate code from.
+ * @param {!Workspace} _workspace Workspace to generate code from.
  */
-Blockly.Generator.prototype.init = function(_workspace) {
+Generator.prototype.init = function(_workspace) {
   // Optionally override
   // Create a dictionary of definitions to be printed before the code.
   this.definitions_ = Object.create(null);
@@ -492,14 +499,14 @@ Blockly.Generator.prototype.init = function(_workspace) {
  * Subclasses may override this, e.g. to generate code for statements following
  * the block, or to handle comments for the specified block and any connected
  * value blocks.
- * @param {!Blockly.Block} _block The current block.
+ * @param {!Block} _block The current block.
  * @param {string} code The code created for this block.
  * @param {boolean=} _opt_thisOnly True to generate code for only this
  *     statement.
  * @return {string} Code with comments and subsequent blocks added.
  * @protected
  */
-Blockly.Generator.prototype.scrub_ = function(_block, code, _opt_thisOnly) {
+Generator.prototype.scrub_ = function(_block, code, _opt_thisOnly) {
   // Optionally override
   return code;
 };
@@ -511,7 +518,7 @@ Blockly.Generator.prototype.scrub_ = function(_block, code, _opt_thisOnly) {
  * @param {string} code Generated code.
  * @return {string} Completed code.
  */
-Blockly.Generator.prototype.finish = function(code) {
+Generator.prototype.finish = function(code) {
   // Optionally override
   // Clean up temporary data.
   delete this.definitions_;
@@ -527,7 +534,9 @@ Blockly.Generator.prototype.finish = function(code) {
  * @param {string} line Line of generated code.
  * @return {string} Legal line of code.
  */
-Blockly.Generator.prototype.scrubNakedValue = function(line) {
+Generator.prototype.scrubNakedValue = function(line) {
   // Optionally override
   return line;
 };
+
+exports = Generator;
diff --git a/core/grid.js b/core/grid.js
index 56171ef50..1a1d5f2a3 100644
--- a/core/grid.js
+++ b/core/grid.js
@@ -11,11 +11,12 @@
  */
 'use strict';
 
-goog.provide('Blockly.Grid');
+goog.module('Blockly.Grid');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.utils.dom');
-goog.require('Blockly.utils.Svg');
-goog.require('Blockly.utils.userAgent');
+const Svg = goog.require('Blockly.utils.Svg');
+const dom = goog.require('Blockly.utils.dom');
+const userAgent = goog.require('Blockly.utils.userAgent');
 
 
 /**
@@ -27,7 +28,7 @@ goog.require('Blockly.utils.userAgent');
  *     https://developers.google.com/blockly/guides/configure/web/grid
  * @constructor
  */
-Blockly.Grid = function(pattern, options) {
+const Grid = function(pattern, options) {
   /**
    * The grid's SVG pattern, created during injection.
    * @type {!SVGElement}
@@ -61,8 +62,8 @@ Blockly.Grid = function(pattern, options) {
    * @type {SVGElement}
    * @private
    */
-  this.line2_ = this.line1_ &&
-    (/** @type {SVGElement} */ (this.line1_.nextSibling));
+  this.line2_ =
+      this.line1_ && (/** @type {SVGElement} */ (this.line1_.nextSibling));
 
   /**
    * Whether blocks should snap to the grid.
@@ -78,14 +79,14 @@ Blockly.Grid = function(pattern, options) {
  * @type {number}
  * @private
  */
-Blockly.Grid.prototype.scale_ = 1;
+Grid.prototype.scale_ = 1;
 
 /**
  * Dispose of this grid and unlink from the DOM.
  * @package
  * @suppress {checkTypes}
  */
-Blockly.Grid.prototype.dispose = function() {
+Grid.prototype.dispose = function() {
   this.gridPattern_ = null;
 };
 
@@ -94,7 +95,7 @@ Blockly.Grid.prototype.dispose = function() {
  * @return {boolean} True if blocks should snap, false otherwise.
  * @package
  */
-Blockly.Grid.prototype.shouldSnap = function() {
+Grid.prototype.shouldSnap = function() {
   return this.snapToGrid_;
 };
 
@@ -103,7 +104,7 @@ Blockly.Grid.prototype.shouldSnap = function() {
  * @return {number} The spacing of the grid points.
  * @package
  */
-Blockly.Grid.prototype.getSpacing = function() {
+Grid.prototype.getSpacing = function() {
   return this.spacing_;
 };
 
@@ -113,7 +114,7 @@ Blockly.Grid.prototype.getSpacing = function() {
  * @return {string} The pattern ID.
  * @package
  */
-Blockly.Grid.prototype.getPatternId = function() {
+Grid.prototype.getPatternId = function() {
   return this.gridPattern_.id;
 };
 
@@ -122,17 +123,17 @@ Blockly.Grid.prototype.getPatternId = function() {
  * @param {number} scale The new workspace scale.
  * @package
  */
-Blockly.Grid.prototype.update = function(scale) {
+Grid.prototype.update = function(scale) {
   this.scale_ = scale;
   // MSIE freaks if it sees a 0x0 pattern, so set empty patterns to 100x100.
-  var safeSpacing = (this.spacing_ * scale) || 100;
+  const safeSpacing = (this.spacing_ * scale) || 100;
 
   this.gridPattern_.setAttribute('width', safeSpacing);
   this.gridPattern_.setAttribute('height', safeSpacing);
 
-  var half = Math.floor(this.spacing_ / 2) + 0.5;
-  var start = half - this.length_ / 2;
-  var end = half + this.length_ / 2;
+  let half = Math.floor(this.spacing_ / 2) + 0.5;
+  let start = half - this.length_ / 2;
+  let end = half + this.length_ / 2;
 
   half *= scale;
   start *= scale;
@@ -153,8 +154,7 @@ Blockly.Grid.prototype.update = function(scale) {
  * @param {number} y2 The new y end position of the line (in px).
  * @private
  */
-Blockly.Grid.prototype.setLineAttributes_ = function(line, width,
-    x1, x2, y1, y2) {
+Grid.prototype.setLineAttributes_ = function(line, width, x1, x2, y1, y2) {
   if (line) {
     line.setAttribute('stroke-width', width);
     line.setAttribute('x1', x1);
@@ -171,11 +171,11 @@ Blockly.Grid.prototype.setLineAttributes_ = function(line, width,
  * @param {number} y The new y position of the grid (in px).
  * @package
  */
-Blockly.Grid.prototype.moveTo = function(x, y) {
+Grid.prototype.moveTo = function(x, y) {
   this.gridPattern_.setAttribute('x', x);
   this.gridPattern_.setAttribute('y', y);
 
-  if (Blockly.utils.userAgent.IE || Blockly.utils.userAgent.EDGE) {
+  if (userAgent.IE || userAgent.EDGE) {
     // IE/Edge doesn't notice that the x/y offsets have changed.
     // Force an update.
     this.update(this.scale_);
@@ -190,33 +190,30 @@ Blockly.Grid.prototype.moveTo = function(x, y) {
  * @return {!SVGElement} The SVG element for the grid pattern.
  * @package
  */
-Blockly.Grid.createDom = function(rnd, gridOptions, defs) {
+Grid.createDom = function(rnd, gridOptions, defs) {
   /*
     <pattern id="blocklyGridPattern837493" patternUnits="userSpaceOnUse">
       <rect stroke="#888" />
       <rect stroke="#888" />
     </pattern>
   */
-  var gridPattern = Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.PATTERN,
-      {
-        'id': 'blocklyGridPattern' + rnd,
-        'patternUnits': 'userSpaceOnUse'
-      }, defs);
+  const gridPattern = dom.createSvgElement(
+      Svg.PATTERN,
+      {'id': 'blocklyGridPattern' + rnd, 'patternUnits': 'userSpaceOnUse'},
+      defs);
   if (gridOptions['length'] > 0 && gridOptions['spacing'] > 0) {
-    Blockly.utils.dom.createSvgElement(
-        Blockly.utils.Svg.LINE,
-        {'stroke': gridOptions['colour']}, gridPattern);
+    dom.createSvgElement(
+        Svg.LINE, {'stroke': gridOptions['colour']}, gridPattern);
     if (gridOptions['length'] > 1) {
-      Blockly.utils.dom.createSvgElement(
-          Blockly.utils.Svg.LINE,
-          {'stroke': gridOptions['colour']}, gridPattern);
+      dom.createSvgElement(
+          Svg.LINE, {'stroke': gridOptions['colour']}, gridPattern);
     }
     // x1, y1, x1, x2 properties will be set later in update.
   } else {
     // Edge 16 doesn't handle empty patterns
-    Blockly.utils.dom.createSvgElement(
-        Blockly.utils.Svg.LINE, {}, gridPattern);
+    dom.createSvgElement(Svg.LINE, {}, gridPattern);
   }
   return gridPattern;
 };
+
+exports = Grid;
diff --git a/core/icon.js b/core/icon.js
index c5f3477cd..69ff3ef37 100644
--- a/core/icon.js
+++ b/core/icon.js
@@ -10,29 +10,31 @@
  */
 'use strict';
 
-goog.provide('Blockly.Icon');
+goog.module('Blockly.Icon');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.browserEvents');
-goog.require('Blockly.utils');
-goog.require('Blockly.utils.Coordinate');
-goog.require('Blockly.utils.dom');
-goog.require('Blockly.utils.Size');
-goog.require('Blockly.utils.Svg');
-
-goog.requireType('Blockly.BlockSvg');
-goog.requireType('Blockly.Bubble');
+/* eslint-disable-next-line no-unused-vars */
+const BlockSvg = goog.requireType('Blockly.BlockSvg');
+/* eslint-disable-next-line no-unused-vars */
+const Bubble = goog.requireType('Blockly.Bubble');
+const Coordinate = goog.require('Blockly.utils.Coordinate');
+const Size = goog.require('Blockly.utils.Size');
+const Svg = goog.require('Blockly.utils.Svg');
+const browserEvents = goog.require('Blockly.browserEvents');
+const dom = goog.require('Blockly.utils.dom');
+const {getRelativeXY, isRightButton} = goog.require('Blockly.utils');
 
 
 /**
  * Class for an icon.
- * @param {Blockly.BlockSvg} block The block associated with this icon.
+ * @param {BlockSvg} block The block associated with this icon.
  * @constructor
  * @abstract
  */
-Blockly.Icon = function(block) {
+const Icon = function(block) {
   /**
    * The block this icon is attached to.
-   * @type {Blockly.BlockSvg}
+   * @type {BlockSvg}
    * @protected
    */
   this.block_ = block;
@@ -47,31 +49,32 @@ Blockly.Icon = function(block) {
 /**
  * Does this icon get hidden when the block is collapsed.
  */
-Blockly.Icon.prototype.collapseHidden = true;
+Icon.prototype.collapseHidden = true;
 
 /**
  * Height and width of icons.
+ * @const
  */
-Blockly.Icon.prototype.SIZE = 17;
+Icon.prototype.SIZE = 17;
 
 /**
  * Bubble UI (if visible).
- * @type {?Blockly.Bubble}
+ * @type {?Bubble}
  * @protected
  */
-Blockly.Icon.prototype.bubble_ = null;
+Icon.prototype.bubble_ = null;
 
 /**
  * Absolute coordinate of icon's center.
- * @type {?Blockly.utils.Coordinate}
+ * @type {?Coordinate}
  * @protected
  */
-Blockly.Icon.prototype.iconXY_ = null;
+Icon.prototype.iconXY_ = null;
 
 /**
  * Create the icon on the block.
  */
-Blockly.Icon.prototype.createIcon = function() {
+Icon.prototype.createIcon = function() {
   if (this.iconGroup_) {
     // Icon already exists.
     return;
@@ -81,17 +84,16 @@ Blockly.Icon.prototype.createIcon = function() {
     ...
   </g>
   */
-  this.iconGroup_ = Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.G,
-      {'class': 'blocklyIconGroup'}, null);
+  this.iconGroup_ =
+      dom.createSvgElement(Svg.G, {'class': 'blocklyIconGroup'}, null);
   if (this.block_.isInFlyout) {
-    Blockly.utils.dom.addClass(
+    dom.addClass(
         /** @type {!Element} */ (this.iconGroup_), 'blocklyIconGroupReadonly');
   }
   this.drawIcon_(this.iconGroup_);
 
   this.block_.getSvgRoot().appendChild(this.iconGroup_);
-  Blockly.browserEvents.conditionalBind(
+  browserEvents.conditionalBind(
       this.iconGroup_, 'mouseup', this, this.iconClick_);
   this.updateEditable();
 };
@@ -99,9 +101,9 @@ Blockly.Icon.prototype.createIcon = function() {
 /**
  * Dispose of this icon.
  */
-Blockly.Icon.prototype.dispose = function() {
+Icon.prototype.dispose = function() {
   // Dispose of and unlink the icon.
-  Blockly.utils.dom.removeNode(this.iconGroup_);
+  dom.removeNode(this.iconGroup_);
   this.iconGroup_ = null;
   // Dispose of and unlink the bubble.
   this.setVisible(false);
@@ -111,7 +113,7 @@ Blockly.Icon.prototype.dispose = function() {
 /**
  * Add or remove the UI indicating if this icon may be clicked or not.
  */
-Blockly.Icon.prototype.updateEditable = function() {
+Icon.prototype.updateEditable = function() {
   // No-op on the base class.
 };
 
@@ -119,7 +121,7 @@ Blockly.Icon.prototype.updateEditable = function() {
  * Is the associated bubble visible?
  * @return {boolean} True if the bubble is visible.
  */
-Blockly.Icon.prototype.isVisible = function() {
+Icon.prototype.isVisible = function() {
   return !!this.bubble_;
 };
 
@@ -128,12 +130,12 @@ Blockly.Icon.prototype.isVisible = function() {
  * @param {!Event} e Mouse click event.
  * @protected
  */
-Blockly.Icon.prototype.iconClick_ = function(e) {
+Icon.prototype.iconClick_ = function(e) {
   if (this.block_.workspace.isDragging()) {
     // Drag operation is concluding.  Don't open the editor.
     return;
   }
-  if (!this.block_.isInFlyout && !Blockly.utils.isRightButton(e)) {
+  if (!this.block_.isInFlyout && !isRightButton(e)) {
     this.setVisible(!this.isVisible());
   }
 };
@@ -141,7 +143,7 @@ Blockly.Icon.prototype.iconClick_ = function(e) {
 /**
  * Change the colour of the associated bubble to match its block.
  */
-Blockly.Icon.prototype.applyColour = function() {
+Icon.prototype.applyColour = function() {
   if (this.isVisible()) {
     this.bubble_.setColour(this.block_.style.colourPrimary);
   }
@@ -149,9 +151,9 @@ Blockly.Icon.prototype.applyColour = function() {
 
 /**
  * Notification that the icon has moved.  Update the arrow accordingly.
- * @param {!Blockly.utils.Coordinate} xy Absolute location in workspace coordinates.
+ * @param {!Coordinate} xy Absolute location in workspace coordinates.
  */
-Blockly.Icon.prototype.setIconLocation = function(xy) {
+Icon.prototype.setIconLocation = function(xy) {
   this.iconXY_ = xy;
   if (this.isVisible()) {
     this.bubble_.setAnchorLocation(xy);
@@ -162,25 +164,25 @@ Blockly.Icon.prototype.setIconLocation = function(xy) {
  * Notification that the icon has moved, but we don't really know where.
  * Recompute the icon's location from scratch.
  */
-Blockly.Icon.prototype.computeIconLocation = function() {
+Icon.prototype.computeIconLocation = function() {
   // Find coordinates for the centre of the icon and update the arrow.
-  var blockXY = this.block_.getRelativeToSurfaceXY();
-  var iconXY = Blockly.utils.getRelativeXY(
+  const blockXY = this.block_.getRelativeToSurfaceXY();
+  const iconXY = getRelativeXY(
       /** @type {!SVGElement} */ (this.iconGroup_));
-  var newXY = new Blockly.utils.Coordinate(
+  const newXY = new Coordinate(
       blockXY.x + iconXY.x + this.SIZE / 2,
       blockXY.y + iconXY.y + this.SIZE / 2);
-  if (!Blockly.utils.Coordinate.equals(this.getIconLocation(), newXY)) {
+  if (!Coordinate.equals(this.getIconLocation(), newXY)) {
     this.setIconLocation(newXY);
   }
 };
 
 /**
  * Returns the center of the block's icon relative to the surface.
- * @return {?Blockly.utils.Coordinate} Object with x and y properties in
+ * @return {?Coordinate} Object with x and y properties in
  *     workspace coordinates.
  */
-Blockly.Icon.prototype.getIconLocation = function() {
+Icon.prototype.getIconLocation = function() {
   return this.iconXY_;
 };
 
@@ -188,12 +190,11 @@ Blockly.Icon.prototype.getIconLocation = function() {
  * Get the size of the icon as used for rendering.
  * This differs from the actual size of the icon, because it bulges slightly
  * out of its row rather than increasing the height of its row.
- * @return {!Blockly.utils.Size} Height and width.
+ * @return {!Size} Height and width.
  */
 // TODO (#2562): Remove getCorrectedSize.
-Blockly.Icon.prototype.getCorrectedSize = function() {
-  return new Blockly.utils.Size(
-      Blockly.Icon.prototype.SIZE, Blockly.Icon.prototype.SIZE - 2);
+Icon.prototype.getCorrectedSize = function() {
+  return new Size(Icon.prototype.SIZE, Icon.prototype.SIZE - 2);
 };
 
 /**
@@ -201,10 +202,12 @@ Blockly.Icon.prototype.getCorrectedSize = function() {
  * @param {!Element} group The icon group.
  * @protected
  */
-Blockly.Icon.prototype.drawIcon_;
+Icon.prototype.drawIcon_;
 
 /**
  * Show or hide the icon.
  * @param {boolean} visible True if the icon should be visible.
  */
-Blockly.Icon.prototype.setVisible;
+Icon.prototype.setVisible;
+
+exports = Icon;
diff --git a/core/input.js b/core/input.js
index 443bfc83f..afa7a3358 100644
--- a/core/input.js
+++ b/core/input.js
@@ -10,31 +10,36 @@
  */
 'use strict';
 
-goog.provide('Blockly.Input');
+goog.module('Blockly.Input');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.Connection');
-goog.require('Blockly.fieldRegistry');
+/* eslint-disable-next-line no-unused-vars */
+const Block = goog.requireType('Blockly.Block');
+/* eslint-disable-next-line no-unused-vars */
+const BlockSvg = goog.requireType('Blockly.BlockSvg');
+/* eslint-disable-next-line no-unused-vars */
+const Connection = goog.require('Blockly.Connection');
+/* eslint-disable-next-line no-unused-vars */
+const Field = goog.requireType('Blockly.Field');
+/* eslint-disable-next-line no-unused-vars */
+const RenderedConnection = goog.requireType('Blockly.RenderedConnection');
+const constants = goog.require('Blockly.constants');
+const fieldRegistry = goog.require('Blockly.fieldRegistry');
+const inputTypes = goog.require('Blockly.inputTypes');
 /** @suppress {extraRequire} */
 goog.require('Blockly.FieldLabel');
-goog.require('Blockly.inputTypes');
-
-goog.requireType('Blockly.Block');
-goog.requireType('Blockly.BlockSvg');
-goog.requireType('Blockly.Field');
-goog.requireType('Blockly.RenderedConnection');
-
 
 /**
  * Class for an input with an optional field.
  * @param {number} type The type of the input.
  * @param {string} name Language-neutral identifier which may used to find this
  *     input again.
- * @param {!Blockly.Block} block The block containing this input.
- * @param {Blockly.Connection} connection Optional connection for this input.
+ * @param {!Block} block The block containing this input.
+ * @param {Connection} connection Optional connection for this input.
  * @constructor
  */
-Blockly.Input = function(type, name, block, connection) {
-  if (type != Blockly.inputTypes.DUMMY && !name) {
+const Input = function(type, name, block, connection) {
+  if (type != inputTypes.DUMMY && !name) {
     throw Error('Value inputs and statement inputs must have non-empty name.');
   }
   /** @type {number} */
@@ -42,13 +47,13 @@ Blockly.Input = function(type, name, block, connection) {
   /** @type {string} */
   this.name = name;
   /**
-   * @type {!Blockly.Block}
+   * @type {!Block}
    * @private
    */
   this.sourceBlock_ = block;
-  /** @type {Blockly.Connection} */
+  /** @type {Connection} */
   this.connection = connection;
-  /** @type {!Array<!Blockly.Field>} */
+  /** @type {!Array<!Field>} */
   this.fieldRow = [];
 };
 
@@ -56,32 +61,32 @@ Blockly.Input = function(type, name, block, connection) {
  * Alignment of input's fields (left, right or centre).
  * @type {number}
  */
-Blockly.Input.prototype.align = Blockly.constants.ALIGN.LEFT;
+Input.prototype.align = constants.ALIGN.LEFT;
 
 /**
  * Is the input visible?
  * @type {boolean}
  * @private
  */
-Blockly.Input.prototype.visible_ = true;
+Input.prototype.visible_ = true;
 
 /**
  * Get the source block for this input.
- * @return {?Blockly.Block} The source block, or null if there is none.
+ * @return {?Block} The source block, or null if there is none.
  */
-Blockly.Input.prototype.getSourceBlock = function() {
+Input.prototype.getSourceBlock = function() {
   return this.sourceBlock_;
 };
 
 /**
  * Add a field (or label from string), and all prefix and suffix fields, to the
  * end of the input's field row.
- * @param {string|!Blockly.Field} field Something to add as a field.
+ * @param {string|!Field} field Something to add as a field.
  * @param {string=} opt_name Language-neutral identifier which may used to find
  *     this field again.  Should be unique to the host block.
- * @return {!Blockly.Input} The input being append to (to allow chaining).
+ * @return {!Input} The input being append to (to allow chaining).
  */
-Blockly.Input.prototype.appendField = function(field, opt_name) {
+Input.prototype.appendField = function(field, opt_name) {
   this.insertFieldAt(this.fieldRow.length, field, opt_name);
   return this;
 };
@@ -90,12 +95,12 @@ Blockly.Input.prototype.appendField = function(field, opt_name) {
  * Inserts a field (or label from string), and all prefix and suffix fields, at
  * the location of the input's field row.
  * @param {number} index The index at which to insert field.
- * @param {string|!Blockly.Field} field Something to add as a field.
+ * @param {string|!Field} field Something to add as a field.
  * @param {string=} opt_name Language-neutral identifier which may used to find
  *     this field again.  Should be unique to the host block.
  * @return {number} The index following the last inserted field.
  */
-Blockly.Input.prototype.insertFieldAt = function(index, field, opt_name) {
+Input.prototype.insertFieldAt = function(index, field, opt_name) {
   if (index < 0 || index > this.fieldRow.length) {
     throw Error('index ' + index + ' out of bounds.');
   }
@@ -107,7 +112,7 @@ Blockly.Input.prototype.insertFieldAt = function(index, field, opt_name) {
 
   // Generate a FieldLabel when given a plain text field.
   if (typeof field == 'string') {
-    field = /** @type {!Blockly.Field} **/ (Blockly.fieldRegistry.fromJson({
+    field = /** @type {!Field} **/ (fieldRegistry.fromJson({
       'type': 'field_label',
       'text': field,
     }));
@@ -134,7 +139,7 @@ Blockly.Input.prototype.insertFieldAt = function(index, field, opt_name) {
   }
 
   if (this.sourceBlock_.rendered) {
-    this.sourceBlock_ = /** @type {!Blockly.BlockSvg} */ (this.sourceBlock_);
+    this.sourceBlock_ = /** @type {!BlockSvg} */ (this.sourceBlock_);
     this.sourceBlock_.render();
     // Adding a field will cause the block to change shape.
     this.sourceBlock_.bumpNeighbours();
@@ -150,13 +155,13 @@ Blockly.Input.prototype.insertFieldAt = function(index, field, opt_name) {
  *     and opt_quiet is true.
  * @throws {Error} if the field is not present and opt_quiet is false.
  */
-Blockly.Input.prototype.removeField = function(name, opt_quiet) {
-  for (var i = 0, field; (field = this.fieldRow[i]); i++) {
+Input.prototype.removeField = function(name, opt_quiet) {
+  for (let i = 0, field; (field = this.fieldRow[i]); i++) {
     if (field.name === name) {
       field.dispose();
       this.fieldRow.splice(i, 1);
       if (this.sourceBlock_.rendered) {
-        this.sourceBlock_ = /** @type {!Blockly.BlockSvg} */ (this.sourceBlock_);
+        this.sourceBlock_ = /** @type {!BlockSvg} */ (this.sourceBlock_);
         this.sourceBlock_.render();
         // Removing a field will cause the block to change shape.
         this.sourceBlock_.bumpNeighbours();
@@ -174,7 +179,7 @@ Blockly.Input.prototype.removeField = function(name, opt_quiet) {
  * Gets whether this input is visible or not.
  * @return {boolean} True if visible.
  */
-Blockly.Input.prototype.isVisible = function() {
+Input.prototype.isVisible = function() {
   return this.visible_;
 };
 
@@ -182,32 +187,32 @@ Blockly.Input.prototype.isVisible = function() {
  * Sets whether this input is visible or not.
  * Should only be used to collapse/uncollapse a block.
  * @param {boolean} visible True if visible.
- * @return {!Array<!Blockly.BlockSvg>} List of blocks to render.
+ * @return {!Array<!BlockSvg>} List of blocks to render.
  * @package
  */
-Blockly.Input.prototype.setVisible = function(visible) {
+Input.prototype.setVisible = function(visible) {
   // Note: Currently there are only unit tests for block.setCollapsed()
   // because this function is package. If this function goes back to being a
   // public API tests (lots of tests) should be added.
-  var renderList = [];
+  let renderList = [];
   if (this.visible_ == visible) {
     return renderList;
   }
   this.visible_ = visible;
 
-  for (var y = 0, field; (field = this.fieldRow[y]); y++) {
+  for (let y = 0, field; (field = this.fieldRow[y]); y++) {
     field.setVisible(visible);
   }
   if (this.connection) {
     this.connection =
-      /** @type {!Blockly.RenderedConnection} */ (this.connection);
+        /** @type {!RenderedConnection} */ (this.connection);
     // Has a connection.
     if (visible) {
       renderList = this.connection.startTrackingAll();
     } else {
       this.connection.stopTrackingAll();
     }
-    var child = this.connection.targetBlock();
+    const child = this.connection.targetBlock();
     if (child) {
       child.getSvgRoot().style.display = visible ? 'block' : 'none';
     }
@@ -219,8 +224,8 @@ Blockly.Input.prototype.setVisible = function(visible) {
  * Mark all fields on this input as dirty.
  * @package
  */
-Blockly.Input.prototype.markDirty = function() {
-  for (var y = 0, field; (field = this.fieldRow[y]); y++) {
+Input.prototype.markDirty = function() {
+  for (let y = 0, field; (field = this.fieldRow[y]); y++) {
     field.markDirty();
   }
 };
@@ -229,9 +234,9 @@ Blockly.Input.prototype.markDirty = function() {
  * Change a connection's compatibility.
  * @param {string|Array<string>|null} check Compatible value type or
  *     list of value types.  Null if all types are compatible.
- * @return {!Blockly.Input} The input being modified (to allow chaining).
+ * @return {!Input} The input being modified (to allow chaining).
  */
-Blockly.Input.prototype.setCheck = function(check) {
+Input.prototype.setCheck = function(check) {
   if (!this.connection) {
     throw Error('This input does not have a connection.');
   }
@@ -241,14 +246,14 @@ Blockly.Input.prototype.setCheck = function(check) {
 
 /**
  * Change the alignment of the connection's field(s).
- * @param {number} align One of the values of Blockly.constants.ALIGN.
+ * @param {number} align One of the values of constants.ALIGN.
  *   In RTL mode directions are reversed, and ALIGN.RIGHT aligns to the left.
- * @return {!Blockly.Input} The input being modified (to allow chaining).
+ * @return {!Input} The input being modified (to allow chaining).
  */
-Blockly.Input.prototype.setAlign = function(align) {
+Input.prototype.setAlign = function(align) {
   this.align = align;
   if (this.sourceBlock_.rendered) {
-    this.sourceBlock_ = /** @type {!Blockly.BlockSvg} */ (this.sourceBlock_);
+    this.sourceBlock_ = /** @type {!BlockSvg} */ (this.sourceBlock_);
     this.sourceBlock_.render();
   }
   return this;
@@ -257,9 +262,9 @@ Blockly.Input.prototype.setAlign = function(align) {
 /**
  * Changes the connection's shadow block.
  * @param {?Element} shadow DOM representation of a block or null.
- * @return {!Blockly.Input} The input being modified (to allow chaining).
+ * @return {!Input} The input being modified (to allow chaining).
  */
-Blockly.Input.prototype.setShadowDom = function(shadow) {
+Input.prototype.setShadowDom = function(shadow) {
   if (!this.connection) {
     throw Error('This input does not have a connection.');
   }
@@ -271,7 +276,7 @@ Blockly.Input.prototype.setShadowDom = function(shadow) {
  * Returns the XML representation of the connection's shadow block.
  * @return {?Element} Shadow DOM representation of a block or null.
  */
-Blockly.Input.prototype.getShadowDom = function() {
+Input.prototype.getShadowDom = function() {
   if (!this.connection) {
     throw Error('This input does not have a connection.');
   }
@@ -281,11 +286,11 @@ Blockly.Input.prototype.getShadowDom = function() {
 /**
  * Initialize the fields on this input.
  */
-Blockly.Input.prototype.init = function() {
+Input.prototype.init = function() {
   if (!this.sourceBlock_.workspace.rendered) {
     return;  // Headless blocks don't need fields initialized.
   }
-  for (var i = 0; i < this.fieldRow.length; i++) {
+  for (let i = 0; i < this.fieldRow.length; i++) {
     this.fieldRow[i].init();
   }
 };
@@ -294,8 +299,8 @@ Blockly.Input.prototype.init = function() {
  * Sever all links to this input.
  * @suppress {checkTypes}
  */
-Blockly.Input.prototype.dispose = function() {
-  for (var i = 0, field; (field = this.fieldRow[i]); i++) {
+Input.prototype.dispose = function() {
+  for (let i = 0, field; (field = this.fieldRow[i]); i++) {
     field.dispose();
   }
   if (this.connection) {
@@ -303,3 +308,5 @@ Blockly.Input.prototype.dispose = function() {
   }
   this.sourceBlock_ = null;
 };
+
+exports = Input;
diff --git a/core/interfaces/i_collapsible_toolbox_item.js b/core/interfaces/i_collapsible_toolbox_item.js
index 732c7aab7..45bd3ae3e 100644
--- a/core/interfaces/i_collapsible_toolbox_item.js
+++ b/core/interfaces/i_collapsible_toolbox_item.js
@@ -14,7 +14,9 @@
 goog.module('Blockly.ICollapsibleToolboxItem');
 goog.module.declareLegacyNamespace();
 
+/* eslint-disable-next-line no-unused-vars */
 const ISelectableToolboxItem = goog.require('Blockly.ISelectableToolboxItem');
+/* eslint-disable-next-line no-unused-vars */
 const IToolboxItem = goog.requireType('Blockly.IToolboxItem');
 
 
diff --git a/core/interfaces/i_metrics_manager.js b/core/interfaces/i_metrics_manager.js
index 916f14d5d..db1f575c1 100644
--- a/core/interfaces/i_metrics_manager.js
+++ b/core/interfaces/i_metrics_manager.js
@@ -11,92 +11,96 @@
 
 'use strict';
 
-goog.provide('Blockly.IMetricsManager');
+goog.module('Blockly.IMetricsManager');
+goog.module.declareLegacyNamespace();
 
-goog.requireType('Blockly.MetricsManager');
-goog.requireType('Blockly.utils.Metrics');
-goog.requireType('Blockly.utils.Size');
+/* eslint-disable-next-line no-unused-vars */
+const Metrics = goog.requireType('Blockly.utils.Metrics');
+/* eslint-disable-next-line no-unused-vars */
+const Size = goog.requireType('Blockly.utils.Size');
+/* eslint-disable-next-line no-unused-vars */
+const {AbsoluteMetrics, ContainerRegion, ToolboxMetrics} = goog.requireType('Blockly.MetricsManager');
 
 
 /**
  * Interface for a metrics manager.
  * @interface
  */
-Blockly.IMetricsManager = function() {};
+const IMetricsManager = function() {};
 
 /**
  * Returns whether the scroll area has fixed edges.
  * @return {boolean} Whether the scroll area has fixed edges.
  * @package
  */
-Blockly.IMetricsManager.prototype.hasFixedEdges;
+IMetricsManager.prototype.hasFixedEdges;
 
 /**
  * Returns the metrics for the scroll area of the workspace.
  * @param {boolean=} opt_getWorkspaceCoordinates True to get the scroll metrics
  *     in workspace coordinates, false to get them in pixel coordinates.
- * @param {!Blockly.MetricsManager.ContainerRegion=} opt_viewMetrics The view
+ * @param {!ContainerRegion=} opt_viewMetrics The view
  *     metrics if they have been previously computed. Passing in null may cause
  *     the view metrics to be computed again, if it is needed.
- * @param {!Blockly.MetricsManager.ContainerRegion=} opt_contentMetrics The
+ * @param {!ContainerRegion=} opt_contentMetrics The
  *     content metrics if they have been previously computed. Passing in null
  *     may cause the content metrics to be computed again, if it is needed.
- * @return {!Blockly.MetricsManager.ContainerRegion} The metrics for the scroll
+ * @return {!ContainerRegion} The metrics for the scroll
  *    container
  */
-Blockly.IMetricsManager.prototype.getScrollMetrics;
+IMetricsManager.prototype.getScrollMetrics;
 
 /**
  * Gets the width and the height of the flyout on the workspace in pixel
  * coordinates. Returns 0 for the width and height if the workspace has a
  * category toolbox instead of a simple toolbox.
  * @param {boolean=} opt_own Whether to only return the workspace's own flyout.
- * @return {!Blockly.MetricsManager.ToolboxMetrics} The width and height of the
+ * @return {!ToolboxMetrics} The width and height of the
  *     flyout.
  * @public
  */
-Blockly.IMetricsManager.prototype.getFlyoutMetrics;
+IMetricsManager.prototype.getFlyoutMetrics;
 
 /**
  * Gets the width, height and position of the toolbox on the workspace in pixel
  * coordinates. Returns 0 for the width and height if the workspace has a simple
  * toolbox instead of a category toolbox. To get the width and height of a
  * simple toolbox @see {@link getFlyoutMetrics}.
- * @return {!Blockly.MetricsManager.ToolboxMetrics} The object with the width,
+ * @return {!ToolboxMetrics} The object with the width,
  *     height and position of the toolbox.
  * @public
  */
-Blockly.IMetricsManager.prototype.getToolboxMetrics;
+IMetricsManager.prototype.getToolboxMetrics;
 
 /**
  * Gets the width and height of the workspace's parent SVG element in pixel
  * coordinates. This area includes the toolbox and the visible workspace area.
- * @return {!Blockly.utils.Size} The width and height of the workspace's parent
+ * @return {!Size} The width and height of the workspace's parent
  *     SVG element.
  * @public
  */
-Blockly.IMetricsManager.prototype.getSvgMetrics;
+IMetricsManager.prototype.getSvgMetrics;
 
 /**
  * Gets the absolute left and absolute top in pixel coordinates.
  * This is where the visible workspace starts in relation to the SVG container.
- * @return {!Blockly.MetricsManager.AbsoluteMetrics} The absolute metrics for
+ * @return {!AbsoluteMetrics} The absolute metrics for
  *     the workspace.
  * @public
  */
-Blockly.IMetricsManager.prototype.getAbsoluteMetrics;
+IMetricsManager.prototype.getAbsoluteMetrics;
 
 /**
  * Gets the metrics for the visible workspace in either pixel or workspace
  * coordinates. The visible workspace does not include the toolbox or flyout.
  * @param {boolean=} opt_getWorkspaceCoordinates True to get the view metrics in
  *     workspace coordinates, false to get them in pixel coordinates.
- * @return {!Blockly.MetricsManager.ContainerRegion} The width, height, top and
+ * @return {!ContainerRegion} The width, height, top and
  *     left of the viewport in either workspace coordinates or pixel
  *     coordinates.
  * @public
  */
-Blockly.IMetricsManager.prototype.getViewMetrics;
+IMetricsManager.prototype.getViewMetrics;
 
 /**
  * Gets content metrics in either pixel or workspace coordinates.
@@ -104,11 +108,11 @@ Blockly.IMetricsManager.prototype.getViewMetrics;
  * workspace (workspace comments and blocks).
  * @param {boolean=} opt_getWorkspaceCoordinates True to get the content metrics
  *     in workspace coordinates, false to get them in pixel coordinates.
- * @return {!Blockly.MetricsManager.ContainerRegion} The
+ * @return {!ContainerRegion} The
  *     metrics for the content container.
  * @public
  */
-Blockly.IMetricsManager.prototype.getContentMetrics;
+IMetricsManager.prototype.getContentMetrics;
 
 /**
  * Returns an object with all the metrics required to size scrollbars for a
@@ -138,8 +142,10 @@ Blockly.IMetricsManager.prototype.getContentMetrics;
  * .flyoutHeight: Height of the flyout if it is always open.  Otherwise zero.
  * .toolboxPosition: Top, bottom, left or right. Use TOOLBOX_AT constants to
  *     compare.
- * @return {!Blockly.utils.Metrics} Contains size and position metrics of a top
+ * @return {!Metrics} Contains size and position metrics of a top
  *     level workspace.
  * @public
  */
-Blockly.IMetricsManager.prototype.getMetrics;
+IMetricsManager.prototype.getMetrics;
+
+exports = IMetricsManager;
diff --git a/core/interfaces/i_registrable_field.js b/core/interfaces/i_registrable_field.js
index 2c8c005bd..c9d04325d 100644
--- a/core/interfaces/i_registrable_field.js
+++ b/core/interfaces/i_registrable_field.js
@@ -14,6 +14,7 @@
 goog.module('Blockly.IRegistrableField');
 goog.module.declareLegacyNamespace();
 
+/* eslint-disable-next-line no-unused-vars */
 const Field = goog.requireType('Blockly.Field');
 
 
diff --git a/core/interfaces/i_selectable_toolbox_item.js b/core/interfaces/i_selectable_toolbox_item.js
index 2addc7b9e..cefe35740 100644
--- a/core/interfaces/i_selectable_toolbox_item.js
+++ b/core/interfaces/i_selectable_toolbox_item.js
@@ -14,7 +14,9 @@
 goog.module('Blockly.ISelectableToolboxItem');
 goog.module.declareLegacyNamespace();
 
+/* eslint-disable-next-line no-unused-vars */
 const IToolboxItem = goog.require('Blockly.IToolboxItem');
+/* eslint-disable-next-line no-unused-vars */
 const {FlyoutItemInfoArray} = goog.requireType('Blockly.utils.toolbox');
 
 
diff --git a/core/keyboard_nav/tab_navigate_cursor.js b/core/keyboard_nav/tab_navigate_cursor.js
index 3b82267a1..77fc5a2a2 100644
--- a/core/keyboard_nav/tab_navigate_cursor.js
+++ b/core/keyboard_nav/tab_navigate_cursor.js
@@ -16,6 +16,7 @@ goog.module.declareLegacyNamespace();
 
 const ASTNode = goog.require('Blockly.ASTNode');
 const BasicCursor = goog.require('Blockly.BasicCursor');
+/* eslint-disable-next-line no-unused-vars */
 const Field = goog.requireType('Blockly.Field');
 const {inherits} = goog.require('Blockly.utils.object');
 
diff --git a/core/menu.js b/core/menu.js
index 97f47248a..91cfb4d36 100644
--- a/core/menu.js
+++ b/core/menu.js
@@ -10,29 +10,31 @@
  */
 'use strict';
 
-goog.provide('Blockly.Menu');
+goog.module('Blockly.Menu');
+goog.module.declareLegacyNamespace();
 
-goog.require('Blockly.browserEvents');
-goog.require('Blockly.utils.aria');
-goog.require('Blockly.utils.Coordinate');
-goog.require('Blockly.utils.dom');
-goog.require('Blockly.utils.KeyCodes');
-goog.require('Blockly.utils.style');
-
-goog.requireType('Blockly.MenuItem');
-goog.requireType('Blockly.utils.Size');
+const Coordinate = goog.require('Blockly.utils.Coordinate');
+/* eslint-disable-next-line no-unused-vars */
+const MenuItem = goog.requireType('Blockly.MenuItem');
+const KeyCodes = goog.require('Blockly.utils.KeyCodes');
+/* eslint-disable-next-line no-unused-vars */
+const Size = goog.requireType('Blockly.utils.Size');
+const aria = goog.require('Blockly.utils.aria');
+const browserEvents = goog.require('Blockly.browserEvents');
+const dom = goog.require('Blockly.utils.dom');
+const style = goog.require('Blockly.utils.style');
 
 
 /**
  * A basic menu class.
  * @constructor
  */
-Blockly.Menu = function() {
+const Menu = function() {
   /**
    * Array of menu items.
    * (Nulls are never in the array, but typing the array as nullable prevents
    * the compiler from objecting to .indexOf(null))
-   * @type {!Array<Blockly.MenuItem>}
+   * @type {!Array<MenuItem>}
    * @private
    */
   this.menuItems_ = [];
@@ -41,7 +43,7 @@ Blockly.Menu = function() {
    * Coordinates of the mousedown event that caused this menu to open. Used to
    * prevent the consequent mouseup event due to a simple click from activating
    * a menu item immediately.
-   * @type {?Blockly.utils.Coordinate}
+   * @type {?Coordinate}
    * @package
    */
   this.openingCoords = null;
@@ -49,42 +51,42 @@ Blockly.Menu = function() {
   /**
    * This is the element that we will listen to the real focus events on.
    * A value of null means no menu item is highlighted.
-   * @type {?Blockly.MenuItem}
+   * @type {?MenuItem}
    * @private
    */
   this.highlightedItem_ = null;
 
   /**
    * Mouse over event data.
-   * @type {?Blockly.browserEvents.Data}
+   * @type {?browserEvents.Data}
    * @private
    */
   this.mouseOverHandler_ = null;
 
   /**
    * Click event data.
-   * @type {?Blockly.browserEvents.Data}
+   * @type {?browserEvents.Data}
    * @private
    */
   this.clickHandler_ = null;
 
   /**
    * Mouse enter event data.
-   * @type {?Blockly.browserEvents.Data}
+   * @type {?browserEvents.Data}
    * @private
    */
   this.mouseEnterHandler_ = null;
 
   /**
    * Mouse leave event data.
-   * @type {?Blockly.browserEvents.Data}
+   * @type {?browserEvents.Data}
    * @private
    */
   this.mouseLeaveHandler_ = null;
 
   /**
    * Key down event data.
-   * @type {?Blockly.browserEvents.Data}
+   * @type {?browserEvents.Data}
    * @private
    */
   this.onKeyDownHandler_ = null;
@@ -98,7 +100,7 @@ Blockly.Menu = function() {
 
   /**
    * ARIA name for this menu.
-   * @type {?Blockly.utils.aria.Role}
+   * @type {?aria.Role}
    * @private
    */
   this.roleName_ = null;
@@ -107,9 +109,9 @@ Blockly.Menu = function() {
 
 /**
  * Add a new menu item to the bottom of this menu.
- * @param {!Blockly.MenuItem} menuItem Menu item to append.
+ * @param {!MenuItem} menuItem Menu item to append.
  */
-Blockly.Menu.prototype.addChild = function(menuItem) {
+Menu.prototype.addChild = function(menuItem) {
   this.menuItems_.push(menuItem);
 };
 
@@ -117,32 +119,33 @@ Blockly.Menu.prototype.addChild = function(menuItem) {
  * Creates the menu DOM.
  * @param {!Element} container Element upon which to append this menu.
  */
-Blockly.Menu.prototype.render = function(container) {
-  var element = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+Menu.prototype.render = function(container) {
+  const element =
+      /** @type {!HTMLDivElement} */ (document.createElement('div'));
   // goog-menu is deprecated, use blocklyMenu.  May 2020.
   element.className = 'blocklyMenu goog-menu blocklyNonSelectable';
   element.tabIndex = 0;
   if (this.roleName_) {
-    Blockly.utils.aria.setRole(element, this.roleName_);
+    aria.setRole(element, this.roleName_);
   }
   this.element_ = element;
 
   // Add menu items.
-  for (var i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
+  for (let i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
     element.appendChild(menuItem.createDom());
   }
 
   // Add event handlers.
-  this.mouseOverHandler_ = Blockly.browserEvents.conditionalBind(
-      element, 'mouseover', this, this.handleMouseOver_, true);
-  this.clickHandler_ = Blockly.browserEvents.conditionalBind(
-      element, 'click', this, this.handleClick_, true);
-  this.mouseEnterHandler_ = Blockly.browserEvents.conditionalBind(
+  this.mouseOverHandler_ =
+      browserEvents.conditionalBind(element, 'mouseover', this, this.handleMouseOver_, true);
+  this.clickHandler_ =
+      browserEvents.conditionalBind(element, 'click', this, this.handleClick_, true);
+  this.mouseEnterHandler_ = browserEvents.conditionalBind(
       element, 'mouseenter', this, this.handleMouseEnter_, true);
-  this.mouseLeaveHandler_ = Blockly.browserEvents.conditionalBind(
+  this.mouseLeaveHandler_ = browserEvents.conditionalBind(
       element, 'mouseleave', this, this.handleMouseLeave_, true);
-  this.onKeyDownHandler_ = Blockly.browserEvents.conditionalBind(
-      element, 'keydown', this, this.handleKeyEvent_);
+  this.onKeyDownHandler_ =
+      browserEvents.conditionalBind(element, 'keydown', this, this.handleKeyEvent_);
 
   container.appendChild(element);
 };
@@ -152,7 +155,7 @@ Blockly.Menu.prototype.render = function(container) {
  * @return {?Element} The DOM element.
  * @package
  */
-Blockly.Menu.prototype.getElement = function() {
+Menu.prototype.getElement = function() {
   return this.element_;
 };
 
@@ -160,11 +163,11 @@ Blockly.Menu.prototype.getElement = function() {
  * Focus the menu element.
  * @package
  */
-Blockly.Menu.prototype.focus = function() {
-  var el = this.getElement();
+Menu.prototype.focus = function() {
+  const el = this.getElement();
   if (el) {
-    el.focus({preventScroll:true});
-    Blockly.utils.dom.addClass(el, 'blocklyFocused');
+    el.focus({preventScroll: true});
+    dom.addClass(el, 'blocklyFocused');
   }
 };
 
@@ -172,51 +175,51 @@ Blockly.Menu.prototype.focus = function() {
  * Blur the menu element.
  * @private
  */
-Blockly.Menu.prototype.blur_ = function() {
-  var el = this.getElement();
+Menu.prototype.blur_ = function() {
+  const el = this.getElement();
   if (el) {
     el.blur();
-    Blockly.utils.dom.removeClass(el, 'blocklyFocused');
+    dom.removeClass(el, 'blocklyFocused');
   }
 };
 
 /**
  * Set the menu accessibility role.
- * @param {!Blockly.utils.aria.Role} roleName role name.
+ * @param {!aria.Role} roleName role name.
  * @package
  */
-Blockly.Menu.prototype.setRole = function(roleName) {
+Menu.prototype.setRole = function(roleName) {
   this.roleName_ = roleName;
 };
 
 /**
  * Dispose of this menu.
  */
-Blockly.Menu.prototype.dispose = function() {
+Menu.prototype.dispose = function() {
   // Remove event handlers.
   if (this.mouseOverHandler_) {
-    Blockly.browserEvents.unbind(this.mouseOverHandler_);
+    browserEvents.unbind(this.mouseOverHandler_);
     this.mouseOverHandler_ = null;
   }
   if (this.clickHandler_) {
-    Blockly.browserEvents.unbind(this.clickHandler_);
+    browserEvents.unbind(this.clickHandler_);
     this.clickHandler_ = null;
   }
   if (this.mouseEnterHandler_) {
-    Blockly.browserEvents.unbind(this.mouseEnterHandler_);
+    browserEvents.unbind(this.mouseEnterHandler_);
     this.mouseEnterHandler_ = null;
   }
   if (this.mouseLeaveHandler_) {
-    Blockly.browserEvents.unbind(this.mouseLeaveHandler_);
+    browserEvents.unbind(this.mouseLeaveHandler_);
     this.mouseLeaveHandler_ = null;
   }
   if (this.onKeyDownHandler_) {
-    Blockly.browserEvents.unbind(this.onKeyDownHandler_);
+    browserEvents.unbind(this.onKeyDownHandler_);
     this.onKeyDownHandler_ = null;
   }
 
   // Remove menu items.
-  for (var i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
+  for (let i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
     menuItem.dispose();
   }
   this.element_ = null;
@@ -228,19 +231,19 @@ Blockly.Menu.prototype.dispose = function() {
  * Returns the child menu item that owns the given DOM element,
  * or null if no such menu item is found.
  * @param {Element} elem DOM element whose owner is to be returned.
- * @return {?Blockly.MenuItem} Menu item for which the DOM element belongs to.
+ * @return {?MenuItem} Menu item for which the DOM element belongs to.
  * @private
  */
-Blockly.Menu.prototype.getMenuItem_ = function(elem) {
-  var menuElem = this.getElement();
+Menu.prototype.getMenuItem_ = function(elem) {
+  const menuElem = this.getElement();
   // Node might be the menu border (resulting in no associated menu item), or
   // a menu item's div, or some element within the menu item.
   // Walk up parents until one meets either the menu's root element, or
   // a menu item's div.
   while (elem && elem != menuElem) {
-    if (Blockly.utils.dom.hasClass(elem, 'blocklyMenuItem')) {
+    if (dom.hasClass(elem, 'blocklyMenuItem')) {
       // Having found a menu item's div, locate that menu item in this menu.
-      for (var i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
+      for (let i = 0, menuItem; (menuItem = this.menuItems_[i]); i++) {
         if (menuItem.getElement() == elem) {
           return menuItem;
         }
@@ -255,11 +258,11 @@ Blockly.Menu.prototype.getMenuItem_ = function(elem) {
 
 /**
  * Highlights the given menu item, or clears highlighting if null.
- * @param {?Blockly.MenuItem} item Item to highlight, or null.
+ * @param {?MenuItem} item Item to highlight, or null.
  * @package
  */
-Blockly.Menu.prototype.setHighlighted = function(item) {
-  var currentHighlighted = this.highlightedItem_;
+Menu.prototype.setHighlighted = function(item) {
+  const currentHighlighted = this.highlightedItem_;
   if (currentHighlighted) {
     currentHighlighted.setHighlighted(false);
     this.highlightedItem_ = null;
@@ -269,12 +272,11 @@ Blockly.Menu.prototype.setHighlighted = function(item) {
     this.highlightedItem_ = item;
     // Bring the highlighted item into view. This has no effect if the menu is
     // not scrollable.
-    var el = /** @type {!Element} */ (this.getElement());
-    Blockly.utils.style.scrollIntoContainerView(
+    const el = /** @type {!Element} */ (this.getElement());
+    style.scrollIntoContainerView(
         /** @type {!Element} */ (item.getElement()), el);
 
-    Blockly.utils.aria.setState(el, Blockly.utils.aria.State.ACTIVEDESCENDANT,
-        item.getId());
+    aria.setState(el, aria.State.ACTIVEDESCENDANT, item.getId());
   }
 };
 
@@ -283,8 +285,8 @@ Blockly.Menu.prototype.setHighlighted = function(item) {
  * highlighted).
  * @package
  */
-Blockly.Menu.prototype.highlightNext = function() {
-  var index = this.menuItems_.indexOf(this.highlightedItem_);
+Menu.prototype.highlightNext = function() {
+  const index = this.menuItems_.indexOf(this.highlightedItem_);
   this.highlightHelper_(index, 1);
 };
 
@@ -293,8 +295,8 @@ Blockly.Menu.prototype.highlightNext = function() {
  * currently highlighted).
  * @package
  */
-Blockly.Menu.prototype.highlightPrevious = function() {
-  var index = this.menuItems_.indexOf(this.highlightedItem_);
+Menu.prototype.highlightPrevious = function() {
+  const index = this.menuItems_.indexOf(this.highlightedItem_);
   this.highlightHelper_(index < 0 ? this.menuItems_.length : index, -1);
 };
 
@@ -302,7 +304,7 @@ Blockly.Menu.prototype.highlightPrevious = function() {
  * Highlights the first highlightable item.
  * @private
  */
-Blockly.Menu.prototype.highlightFirst_ = function() {
+Menu.prototype.highlightFirst_ = function() {
   this.highlightHelper_(-1, 1);
 };
 
@@ -310,7 +312,7 @@ Blockly.Menu.prototype.highlightFirst_ = function() {
  * Highlights the last highlightable item.
  * @private
  */
-Blockly.Menu.prototype.highlightLast_ = function() {
+Menu.prototype.highlightLast_ = function() {
   this.highlightHelper_(this.menuItems_.length, -1);
 };
 
@@ -321,9 +323,9 @@ Blockly.Menu.prototype.highlightLast_ = function() {
  * @param {number} delta Step direction: 1 to go down, -1 to go up.
  * @private
  */
-Blockly.Menu.prototype.highlightHelper_ = function(startIndex, delta) {
-  var index = startIndex + delta;
-  var menuItem;
+Menu.prototype.highlightHelper_ = function(startIndex, delta) {
+  let index = startIndex + delta;
+  let menuItem;
   while ((menuItem = this.menuItems_[index])) {
     if (menuItem.isEnabled()) {
       this.setHighlighted(menuItem);
@@ -340,8 +342,8 @@ Blockly.Menu.prototype.highlightHelper_ = function(startIndex, delta) {
  * @param {!Event} e Mouse event to handle.
  * @private
  */
-Blockly.Menu.prototype.handleMouseOver_ = function(e) {
-  var menuItem = this.getMenuItem_(/** @type {Element} */ (e.target));
+Menu.prototype.handleMouseOver_ = function(e) {
+  const menuItem = this.getMenuItem_(/** @type {Element} */ (e.target));
 
   if (menuItem) {
     if (menuItem.isEnabled()) {
@@ -359,13 +361,13 @@ Blockly.Menu.prototype.handleMouseOver_ = function(e) {
  * @param {!Event} e Click event to handle.
  * @private
  */
-Blockly.Menu.prototype.handleClick_ = function(e) {
-  var oldCoords = this.openingCoords;
+Menu.prototype.handleClick_ = function(e) {
+  const oldCoords = this.openingCoords;
   // Clear out the saved opening coords immediately so they're not used twice.
   this.openingCoords = null;
   if (oldCoords && typeof e.clientX == 'number') {
-    var newCoords = new Blockly.utils.Coordinate(e.clientX, e.clientY);
-    if (Blockly.utils.Coordinate.distance(oldCoords, newCoords) < 1) {
+    const newCoords = new Coordinate(e.clientX, e.clientY);
+    if (Coordinate.distance(oldCoords, newCoords) < 1) {
       // This menu was opened by a mousedown and we're handling the consequent
       // click event. The coords haven't changed, meaning this was the same
       // opening event. Don't do the usual behavior because the menu just popped
@@ -374,7 +376,7 @@ Blockly.Menu.prototype.handleClick_ = function(e) {
     }
   }
 
-  var menuItem = this.getMenuItem_(/** @type {Element} */ (e.target));
+  const menuItem = this.getMenuItem_(/** @type {Element} */ (e.target));
   if (menuItem) {
     menuItem.performAction();
   }
@@ -385,7 +387,7 @@ Blockly.Menu.prototype.handleClick_ = function(e) {
  * @param {!Event} _e Mouse event to handle.
  * @private
  */
-Blockly.Menu.prototype.handleMouseEnter_ = function(_e) {
+Menu.prototype.handleMouseEnter_ = function(_e) {
   this.focus();
 };
 
@@ -394,7 +396,7 @@ Blockly.Menu.prototype.handleMouseEnter_ = function(_e) {
  * @param {!Event} _e Mouse event to handle.
  * @private
  */
-Blockly.Menu.prototype.handleMouseLeave_ = function(_e) {
+Menu.prototype.handleMouseLeave_ = function(_e) {
   if (this.getElement()) {
     this.blur_();
     this.setHighlighted(null);
@@ -409,7 +411,7 @@ Blockly.Menu.prototype.handleMouseLeave_ = function(_e) {
  * @param {!Event} e Key event to handle.
  * @private
  */
-Blockly.Menu.prototype.handleKeyEvent_ = function(e) {
+Menu.prototype.handleKeyEvent_ = function(e) {
   if (!this.menuItems_.length) {
     // Empty menu.
     return;
@@ -419,30 +421,30 @@ Blockly.Menu.prototype.handleKeyEvent_ = function(e) {
     return;
   }
 
-  var highlighted = this.highlightedItem_;
+  const highlighted = this.highlightedItem_;
   switch (e.keyCode) {
-    case Blockly.utils.KeyCodes.ENTER:
-    case Blockly.utils.KeyCodes.SPACE:
+    case KeyCodes.ENTER:
+    case KeyCodes.SPACE:
       if (highlighted) {
         highlighted.performAction();
       }
       break;
 
-    case Blockly.utils.KeyCodes.UP:
+    case KeyCodes.UP:
       this.highlightPrevious();
       break;
 
-    case Blockly.utils.KeyCodes.DOWN:
+    case KeyCodes.DOWN:
       this.highlightNext();
       break;
 
-    case Blockly.utils.KeyCodes.PAGE_UP:
-    case Blockly.utils.KeyCodes.HOME:
+    case KeyCodes.PAGE_UP:
+    case KeyCodes.HOME:
       this.highlightFirst_();
       break;
 
-    case Blockly.utils.KeyCodes.PAGE_DOWN:
-    case Blockly.utils.KeyCodes.END:
+    case KeyCodes.PAGE_DOWN:
+    case KeyCodes.END:
       this.highlightLast_();
       break;
 
@@ -457,13 +459,16 @@ Blockly.Menu.prototype.handleKeyEvent_ = function(e) {
 
 /**
  * Get the size of a rendered menu.
- * @return {!Blockly.utils.Size} Object with width and height properties.
+ * @return {!Size} Object with width and height properties.
  * @package
  */
-Blockly.Menu.prototype.getSize = function() {
-  var menuDom = this.getElement();
-  var menuSize = Blockly.utils.style.getSize(/** @type {!Element} */ (menuDom));
+Menu.prototype.getSize = function() {
+  const menuDom = this.getElement();
+  const menuSize = style.getSize(/** @type {!Element} */
+                           (menuDom));
   // Recalculate height for the total content, not only box height.
   menuSize.height = menuDom.scrollHeight;
   return menuSize;
 };
+
+exports = Menu;
diff --git a/core/renderers/common/info.js b/core/renderers/common/info.js
index 73e02dfff..0f8548192 100644
--- a/core/renderers/common/info.js
+++ b/core/renderers/common/info.js
@@ -13,25 +13,33 @@
 goog.module('Blockly.blockRendering.RenderInfo');
 goog.module.declareLegacyNamespace();
 
+/* eslint-disable-next-line no-unused-vars */
 const BlockSvg = goog.requireType('Blockly.BlockSvg');
 const BottomRow = goog.require('Blockly.blockRendering.BottomRow');
+/* eslint-disable-next-line no-unused-vars */
 const ConstantProvider = goog.requireType('Blockly.blockRendering.ConstantProvider');
 const ExternalValueInput = goog.require('Blockly.blockRendering.ExternalValueInput');
 const Field = goog.require('Blockly.blockRendering.Field');
 const Hat = goog.require('Blockly.blockRendering.Hat');
 const Icon = goog.require('Blockly.blockRendering.Icon');
 const InlineInput = goog.require('Blockly.blockRendering.InlineInput');
+/* eslint-disable-next-line no-unused-vars */
 const Input = goog.requireType('Blockly.Input');
 const InputRow = goog.require('Blockly.blockRendering.InputRow');
 const InRowSpacer = goog.require('Blockly.blockRendering.InRowSpacer');
 const JaggedEdge = goog.require('Blockly.blockRendering.JaggedEdge');
+/* eslint-disable-next-line no-unused-vars */
 const Measurable = goog.require('Blockly.blockRendering.Measurable');
 const NextConnection = goog.require('Blockly.blockRendering.NextConnection');
 const OutputConnection = goog.require('Blockly.blockRendering.OutputConnection');
 const PreviousConnection = goog.require('Blockly.blockRendering.PreviousConnection');
+/* eslint-disable-next-line no-unused-vars */
 const RenderedConnection = goog.requireType('Blockly.RenderedConnection');
+/* eslint-disable-next-line no-unused-vars */
 const Renderer = goog.requireType('Blockly.blockRendering.Renderer');
+/* eslint-disable-next-line no-unused-vars */
 const RoundCorner = goog.require('Blockly.blockRendering.RoundCorner');
+/* eslint-disable-next-line no-unused-vars */
 const Row = goog.require('Blockly.blockRendering.Row');
 const SpacerRow = goog.require('Blockly.blockRendering.SpacerRow');
 const SquareCorner = goog.require('Blockly.blockRendering.SquareCorner');
diff --git a/scripts/goog_module/convert-file.sh b/scripts/goog_module/convert-file.sh
index 1861ad7f3..f3138e9cf 100755
--- a/scripts/goog_module/convert-file.sh
+++ b/scripts/goog_module/convert-file.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #######################################
-# Logging functions
+# Logging functions.
 #######################################
 COLOR_NONE="\033[0m"
 GREEN="\033[0;32m"
@@ -20,17 +20,27 @@ warn() {
 err() {
   echo -e  "${RED}[ERROR]:${COLOR_NONE} $*" >&2
 }
+reenter_instructions() {
+  echo -e  "${ORANGE}$*${COLOR_NONE}" >&2
+}
+
 #######################################
 # Checks whether the provided filepath exists.
 # Arguments:
 #   The filepath to check for existence.
+#   Optional: Whether to log an error.
 #######################################
 verify-filepath() {
-  if [[ ! -f "$1" ]]; then
-    err "File $1 does not exist"
+  local filepath="$1"
+  local no_log="$2"
+  if [[ ! -f "${filepath}" ]]; then
+    if [[ -z "${no_log}" || "${no_log}" == 'true' ]]; then
+      err "File ${filepath} does not exist"
+    fi
     return 1
   fi
 }
+
 #######################################
 # Creates a commit with a message based on the specified step and file.
 # Arguments:
@@ -40,11 +50,11 @@ verify-filepath() {
 commit-step() {
   local step="$1"
   local filepath="$2"
-  if [ -z "${step}" ]; then
+  if [[ -z "${step}" ]]; then
     err "Missing argument (1-4)"
     return 1
   fi
-  if [ -z "${filepath}" ]; then
+  if [[ -z "${filepath}" ]]; then
     err "Missing argument filepath"
     return 1
   fi
@@ -78,6 +88,7 @@ commit-step() {
   git commit -m "${message}"
   success "created commit with message: \"${message}\""
 }
+
 #######################################
 # Runs step 2 of the automated conversion.
 # Arguments:
@@ -85,25 +96,10 @@ commit-step() {
 #######################################
 step2 () {
   local filepath="$1"
-  if [ -z "${filepath}" ]; then
-    err "Missing argument filepath"
-    return 1
-  fi
-
-  inf "Verifying single goog.provide declarations..."
-  local provide_count=$(grep -o 'goog.provide' ${filepath} | wc -l)
-  if [[ "${provide_count}" -gt "1" ]]; then
-    err "Cannot convert file with multiple provides. Please split the file first."
-    return 1
-  elif [[ "${provide_count}" -eq "0" ]]; then
-    err "Cannot convert file without a provide."
-    return 1
-  fi
 
   inf "Updating goog.provide declaration..."
   perl -pi -e 's/^goog\.provide(\([^\)]+\)\;)/goog\.module\1\ngoog.module.declareLegacyNamespace\(\)\;/g' "${filepath}"
 
-
   inf "Extracting module name..."
   local module_name=$(perl -nle'print $& while m{(?<=^goog\.module\('\'')([^'\'')]+)}g' "${filepath}")
   if [[ -z "${module_name}" ]]; then
@@ -117,11 +113,9 @@ step2 () {
     inf "Found class \"${class_name}\" in file."
     inf "Updating class declaration..."
     perl -pi -e 's/^('"${module_name}"') =/const '"${class_name}"' =/g' "${filepath}"
-    inf 'Updating class properties...'
-    perl -pi -e 's/^'"${module_name}"'((\.\w+)+) =/'"${class_name}"'\1 =/g' "${filepath}"
 
     inf "Updating local references to class..."
-    perl -pi -e 's/'"${module_name}"'([^'\''])/'"${class_name}"'\1/g' "${filepath}"
+    perl -pi -e 's/'"${module_name}"'(?!['\''\w])/'"${class_name}"'/g' "${filepath}"
 
     inf "Appending class export to end of file..."
     echo "" >> "${filepath}"
@@ -140,20 +134,15 @@ step2 () {
   perl -pi -e 's/'"${module_name}"'\.([^ ]+)/\1/g' "${filepath}"
 
   npm run build:deps
-  success "Completed automation for step 3. Please manually review and add exports for non-private top-level functions."
+  success "Completed automation for step 2. Please manually review and add exports for non-private top-level functions."
 }
+
 #######################################
 # Runs step 3 of the automated conversion.
 # Arguments:
 #   The filepath of the file being converted.
 #######################################
 step3() {
-  local filepath="$1"
-  if [ -z "${filepath}" ]; then
-    err "Missing argument filepath"
-    return 1
-  fi
-
   inf "Extracting module name..."
   local module_name=$(perl -nle'print $& while m{(?<=^goog\.module\('\'')([^'\'')]+)}g' "${filepath}")
   if [[ -z "${module_name}" ]]; then
@@ -162,10 +151,10 @@ step3() {
   fi
   inf "Extracted module name \"${module_name}\""
 
-  local requires=$(perl -nle'print $& while m{^goog.require(|Type)\('\''(.*)'\''\)}g' "${filepath}" | perl -pe 's/goog.require(|Type)\('\''(.*)'\''\)/\2/g')
+  local requires=$(perl -nle'print $& while m{(?:(?<=^goog.require\('\'')|(?<=^goog.requireType\('\''))[^'\'']+}g' "${filepath}")
 
   # Process each require
-  echo "${requires}" | while read -r require ; do
+  echo "${requires}" | while read -r require; do
     inf "Processing require \"${require}\""
     local usages=$(perl -nle'print $& while m{'"${require}"'(?!'\'')}g' "${filepath}" | wc -l)
 
@@ -174,67 +163,62 @@ step3() {
       continue
     fi
 
+    local require_name=$(echo "${require}" | perl -pe 's/(\w+\.)+(\w+)/\2/g')
+    inf "Updating require declaration for ${require}..."
+    perl -pi -e 's/^(goog\.(require|requireType)\('\'"${require}"\''\);)/const '"${require_name}"' = \1/' "${filepath}"
+
+    # Parse property access of module
     local direct_access_count=$(perl -nle'print $& while m{'"${require}"'[^\.'\'']}g' "${filepath}" | wc -l)
     local properties_accessed=$(perl -nle'print $& while m{(?<='"${require}"'\.)(?!prototype)\w+}g' "${filepath}" | tr ' ' '\n' | sort -u)
     # Detect requires overlap
     # (ex: Blockly.utils require and Blockly.utils.dom also in requires)
     local requires_overlap=$(echo "${requires}" | perl -nle'print $& while m{(?<='"${require}"'\.)\w+}g')
-    if [[ ! -z "${requires_overlap}" ]]; then
-      while read -r requires_overlap_prop ; do
+    if [[ -n "${requires_overlap}" ]]; then
+      while read -r requires_overlap_prop; do
         properties_accessed=$(echo "${properties_accessed}" | perl -pe 's/'"${requires_overlap_prop}"'//g')
       done <<<"${requires_overlap}"
     fi
     # Detect module name overlap
     # (ex: Blockly require and Blockly.ContextMenuItems module being converted)
     local module_overlap=$(echo "${module_name}" | perl -nle'print $& while m{(?<='"${require}"'\.)\w+}g')
-    if [[ ! -z "${module_overlap}" ]]; then
+    if [[ -n "${module_overlap}" ]]; then
       properties_accessed=$(echo "${properties_accessed}" | perl -pe 's/'"${module_overlap}"'//g')
     fi
     properties_accessed=$(echo "${properties_accessed}" | perl -pe 's/\s+/ /g' | xargs)
 
-    if [[ "${direct_access_count}" -eq "0" && ! -z "${properties_accessed}" ]]; then
-      local deconstructed_comma=$(echo "${properties_accessed}" | perl -pe 's/\s+/, /g' | perl -pe 's/, $//')
-      inf "Deconstructing ${require} into \"{${deconstructed_comma}}\""
+    if [[ -n "${properties_accessed}" ]]; then
+      local comma_properties=$(echo "${properties_accessed}" | perl -pe 's/\s+/, /g' | perl -pe 's/, $//')
+      inf "Detected references of ${require}: ${comma_properties}"
 
-      inf "Updating require declaration for ${require}..."
-      perl -pi -e 's/^(goog\.(require|requireType)\('\'"${require}"\''\);)/const \{'"${deconstructed_comma}"'\} = \1/' "${filepath}"
-
-      for require_prop in $(echo "${properties_accessed}"); do
-        inf "Updating references of ${require}.${require_prop} to ${require_prop}..."
-        perl -pi -e 's/'"${require}"'\.'"${require_prop}"'([^'\''\w])/'"${require_prop}"'\1/g' "${filepath}"
+      for require_prop in echo "${properties_accessed}"; do
+        inf "Updating references of ${require}.${require_prop} to ${require_name}.${require_prop}..."
+        perl -pi -e 's/'"${require}"'\.'"${require_prop}"'([^'\''\w])/'"${require_name}"'\.'"${require_prop}"'\1/g' "${filepath}"
       done
-      continue
     fi
 
-    local require_name=$(echo "${require}" | perl -pe 's/(\w+\.)+(\w+)/\2/g')
-    inf "Updating require declaration for ${require}..."
-    perl -pi -e 's/^(goog\.(require|requireType)\('\'"${require}"\''\);)/const '"${require_name}"' = \1/' "${filepath}"
-
-    inf "Updating references of ${require} to ${require_name}..."
-    perl -pi -e 's/'"${require}"'([^'\''\w])/'"${require_name}"'\1/g' "${filepath}"
+    inf "Updating direct references of ${require} to ${require_name}..."
+    perl -pi -e 's/'"${require}"'([^'\''\w]\.)/'"${require_name}"'\1/g' "${filepath}"
   done
 
   local missing_requires=$(perl -nle'print $& while m{(?<!'\'')Blockly(\.\w+)+}g' "${filepath}")
-  if [[ ! -z "${missing_require_lines}" ]]; then
-    err "Missing requires for: ${missing_requires} Please manually fix."
+  missing_requires=$(echo "${missing_requires}" | tr ' ' '\n' | sort -u)
+  if [[ -n "${missing_requires}" ]]; then
+    err "Missing requires for:\n${missing_requires}\nPlease manually fix."
   fi
 
   success "Completed automation for step 3. Please manually review and reorder requires."
 }
+
 #######################################
 # Runs step 4 of the automated conversion.
 # Arguments:
 #   The filepath of the file being converted.
 #######################################
 step4() {
-  local filepath="$1"
-  if [ -z ${filepath} ]; then
-    err "filepath is unset"
-    return 1
-  fi
   inf "Running clang-format"
   npx clang-format -i "${filepath}"
 }
+
 #######################################
 # Runs the specified step.
 # Arguments:
@@ -244,11 +228,11 @@ step4() {
 run-step() {
   local step="$1"
   local filepath="$2"
-  if [ -z "${step}" ]; then
+  if [[ -z "${step}" ]]; then
     err "Missing argument (1-4)"
     return 1
   fi
-  if [ -z "${filepath}" ]; then
+  if [[ -z "${filepath}" ]]; then
     err "Missing argument filepath"
     return 1
   fi
@@ -257,45 +241,60 @@ run-step() {
 
   case "${step}" in
     2)
-      step2 ${filepath}
+      step2 "${filepath}"
       ;;
     3)
-      step3 ${filepath}
+      step3 "${filepath}"
       ;;
     4)
-      step4 ${filepath}
+      step4 "${filepath}"
       ;;
     *)
-      err 'INVALID ARGUMENT'
+      err "INVALID ARGUMENT ${step}"
       return 1
       ;;
   esac
 }
+
 #######################################
 # Prints usage information.
 #######################################
-function help {
+help() {
   echo "Conversion steps:"
   echo " 1. Use IDE to convert var to let/const"
   echo " 2. Rewrite the goog.provide statement as goog.module and explicitly enumerate exports"
   echo " 3. Rewrite goog.requires statements and add missing requires (often skipped for simple files)"
   echo " 4. Run clang-format on the whole file"
   echo ""
-  echo "Usage: $0 [-h|-c <number>|-s <number>] <filepath>"
-  echo "  -h                      Display help"
-  echo "  -c <step> <filepath>    Create a commit for the specified step [2-4]"
-  echo "  -s <step> <filepath>    Run the specified step [1-4]"
+  echo "Usage: $0 [-h] [-c <step> <filepath>|-s <step> <filepath>]"
+  echo "  -h                    Display help and exit"
+  echo "  -c <step> <filepath>  Create a commit for the specified step [2-4]"
+  echo "  -s <step> <filepath>  Run the specified step [1-4]"
 }
 
-if [ "$1" = "" ]; then
-  help
-else
-  command="$1"
-  shift
-  case $command in
-    -h)         help $@;;
-    -c)         commit-step $@;;
-    -s)         run-step $@;;
-    *)          help;;
-  esac
-fi
+#######################################
+# Main entry point.
+#######################################
+main() {
+  if [ "$1" = "" ]; then
+    help
+  else
+    local filepath=""
+    # Support filepath as first argument.
+    verify-filepath "$1" "false"
+    if [[ $? -eq 0 ]]; then
+      filepath="$1"
+      shift
+    fi
+
+    local command="$1"
+    shift
+    case $command in
+      -c) commit-step "$@" "${filepath}" ;;
+      -s) run-step "$@" "${filepath}" ;;
+      *) err "INVALID ARGUMENT ${command}";;
+    esac
+  fi
+}
+
+main "$@"
diff --git a/tests/deps.js b/tests/deps.js
index c68a0441f..a8a8146bc 100644
--- a/tests/deps.js
+++ b/tests/deps.js
@@ -10,7 +10,7 @@ goog.addDependency('../../blocks/variables_dynamic.js', ['Blockly.Constants.Vari
 goog.addDependency('../../core/block.js', ['Blockly.Block'], ['Blockly.ASTNode', 'Blockly.Blocks', 'Blockly.Connection', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Events.BlockCreate', 'Blockly.Events.BlockDelete', 'Blockly.Events.BlockMove', 'Blockly.Extensions', 'Blockly.IASTNodeLocation', 'Blockly.IDeletable', 'Blockly.Input', 'Blockly.Tooltip', 'Blockly.Workspace', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.fieldRegistry', 'Blockly.inputTypes', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Size', 'Blockly.utils.object'], {'lang': 'es5'});
 goog.addDependency('../../core/block_animations.js', ['Blockly.blockAnimations'], ['Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/block_drag_surface.js', ['Blockly.BlockDragSurfaceSvg'], ['Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/block_dragger.js', ['Blockly.BlockDragger'], ['Blockly.Events', 'Blockly.Events.BlockDrag', 'Blockly.Events.BlockMove', 'Blockly.IBlockDragger', 'Blockly.InsertionMarkerManager', 'Blockly.blockAnimations', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils.Coordinate', 'Blockly.utils.dom']);
+goog.addDependency('../../core/block_dragger.js', ['Blockly.BlockDragger'], ['Blockly.Events', 'Blockly.Events.BlockDrag', 'Blockly.Events.BlockMove', 'Blockly.IBlockDragger', 'Blockly.InsertionMarkerManager', 'Blockly.blockAnimations', 'Blockly.registry', 'Blockly.utils.Coordinate', 'Blockly.utils.dom'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/block_svg.js', ['Blockly.BlockSvg'], ['Blockly.ASTNode', 'Blockly.Block', 'Blockly.ContextMenu', 'Blockly.ContextMenuRegistry', 'Blockly.Events', 'Blockly.Events.BlockMove', 'Blockly.Events.Selected', 'Blockly.IASTNodeLocationSvg', 'Blockly.IBoundedElement', 'Blockly.ICopyable', 'Blockly.IDraggable', 'Blockly.Msg', 'Blockly.RenderedConnection', 'Blockly.TabNavigateCursor', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Xml', 'Blockly.blockAnimations', 'Blockly.blockRendering.IPathObject', 'Blockly.browserEvents', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.internalConstants', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.deprecation', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent']);
 goog.addDependency('../../core/blockly.js', ['Blockly'], ['Blockly.ComponentManager', 'Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.FinishedLoading', 'Blockly.Events.Ui', 'Blockly.Events.UiBase', 'Blockly.Events.VarCreate', 'Blockly.Procedures', 'Blockly.ShortcutRegistry', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Variables', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.browserEvents', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.inject', 'Blockly.inputTypes', 'Blockly.internalConstants', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.colour', 'Blockly.utils.deprecation', 'Blockly.utils.toolbox']);
 goog.addDependency('../../core/blocks.js', ['Blockly.Blocks'], [], {'lang': 'es6', 'module': 'goog'});
@@ -28,7 +28,7 @@ goog.addDependency('../../core/contextmenu.js', ['Blockly.ContextMenu'], ['Block
 goog.addDependency('../../core/contextmenu_items.js', ['Blockly.ContextMenuItems'], ['Blockly.ContextMenuRegistry', 'Blockly.Events', 'Blockly.constants', 'Blockly.inputTypes'], {'lang': 'es5'});
 goog.addDependency('../../core/contextmenu_registry.js', ['Blockly.ContextMenuRegistry'], [], {'lang': 'es5'});
 goog.addDependency('../../core/css.js', ['Blockly.Css'], [], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/delete_area.js', ['Blockly.DeleteArea'], ['Blockly.BlockSvg', 'Blockly.DragTarget', 'Blockly.IDeleteArea']);
+goog.addDependency('../../core/delete_area.js', ['Blockly.DeleteArea'], ['Blockly.BlockSvg', 'Blockly.DragTarget', 'Blockly.IDeleteArea', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/drag_target.js', ['Blockly.DragTarget'], ['Blockly.IDragTarget'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/dropdowndiv.js', ['Blockly.DropDownDiv'], ['Blockly.utils.Rect', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.style']);
 goog.addDependency('../../core/events/block_events.js', ['Blockly.Events.BlockBase', 'Blockly.Events.BlockChange', 'Blockly.Events.BlockCreate', 'Blockly.Events.BlockDelete', 'Blockly.Events.BlockMove', 'Blockly.Events.Change', 'Blockly.Events.Create', 'Blockly.Events.Delete', 'Blockly.Events.Move'], ['Blockly.Events', 'Blockly.Events.Abstract', 'Blockly.Xml', 'Blockly.connectionTypes', 'Blockly.registry', 'Blockly.utils.Coordinate', 'Blockly.utils.object', 'Blockly.utils.xml']);
@@ -53,24 +53,24 @@ goog.addDependency('../../core/field_angle.js', ['Blockly.FieldAngle'], ['Blockl
 goog.addDependency('../../core/field_checkbox.js', ['Blockly.FieldCheckbox'], ['Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.fieldRegistry', 'Blockly.utils.dom', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_colour.js', ['Blockly.FieldColour'], ['Blockly.Css', 'Blockly.DropDownDiv', 'Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.browserEvents', 'Blockly.fieldRegistry', 'Blockly.utils.IdGenerator', 'Blockly.utils.KeyCodes', 'Blockly.utils.Size', 'Blockly.utils.aria', 'Blockly.utils.colour', 'Blockly.utils.dom', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_dropdown.js', ['Blockly.FieldDropdown'], ['Blockly.DropDownDiv', 'Blockly.Field', 'Blockly.Menu', 'Blockly.MenuItem', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.string', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/field_image.js', ['Blockly.FieldImage'], ['Blockly.Field', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object']);
+goog.addDependency('../../core/field_image.js', ['Blockly.FieldImage'], ['Blockly.Field', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_label.js', ['Blockly.FieldLabel'], ['Blockly.Field', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.dom', 'Blockly.utils.object']);
-goog.addDependency('../../core/field_label_serializable.js', ['Blockly.FieldLabelSerializable'], ['Blockly.FieldLabel', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.object']);
-goog.addDependency('../../core/field_multilineinput.js', ['Blockly.FieldMultilineInput'], ['Blockly.Css', 'Blockly.Field', 'Blockly.FieldTextInput', 'Blockly.WidgetDiv', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.KeyCodes', 'Blockly.utils.Svg', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent'], {'lang': 'es5'});
+goog.addDependency('../../core/field_label_serializable.js', ['Blockly.FieldLabelSerializable'], ['Blockly.FieldLabel', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/field_multilineinput.js', ['Blockly.FieldMultilineInput'], ['Blockly.Css', 'Blockly.Field', 'Blockly.FieldTextInput', 'Blockly.WidgetDiv', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.KeyCodes', 'Blockly.utils.Svg', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_number.js', ['Blockly.FieldNumber'], ['Blockly.FieldTextInput', 'Blockly.fieldRegistry', 'Blockly.utils.aria', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/field_registry.js', ['Blockly.fieldRegistry'], ['Blockly.registry']);
+goog.addDependency('../../core/field_registry.js', ['Blockly.fieldRegistry'], ['Blockly.registry'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_textinput.js', ['Blockly.FieldTextInput'], ['Blockly', 'Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.Msg', 'Blockly.WidgetDiv', 'Blockly.browserEvents', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.KeyCodes', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/field_variable.js', ['Blockly.FieldVariable'], ['Blockly.Events.BlockChange', 'Blockly.FieldDropdown', 'Blockly.Msg', 'Blockly.VariableModel', 'Blockly.Variables', 'Blockly.Xml', 'Blockly.fieldRegistry', 'Blockly.internalConstants', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.object']);
+goog.addDependency('../../core/field_variable.js', ['Blockly.FieldVariable'], ['Blockly.Events.BlockChange', 'Blockly.FieldDropdown', 'Blockly.Msg', 'Blockly.VariableModel', 'Blockly.Variables', 'Blockly.Xml', 'Blockly.fieldRegistry', 'Blockly.internalConstants', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/flyout_base.js', ['Blockly.Flyout'], ['Blockly.Block', 'Blockly.ComponentManager', 'Blockly.DeleteArea', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.VarCreate', 'Blockly.FlyoutMetricsManager', 'Blockly.Gesture', 'Blockly.IFlyout', 'Blockly.ScrollbarPair', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.blockRendering', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.toolbox', 'Blockly.utils.xml']);
 goog.addDependency('../../core/flyout_button.js', ['Blockly.FlyoutButton'], ['Blockly.Css', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.style'], {'lang': 'es5'});
-goog.addDependency('../../core/flyout_horizontal.js', ['Blockly.HorizontalFlyout'], ['Blockly.Block', 'Blockly.DropDownDiv', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object', 'Blockly.utils.toolbox']);
+goog.addDependency('../../core/flyout_horizontal.js', ['Blockly.HorizontalFlyout'], ['Blockly.DropDownDiv', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object', 'Blockly.utils.toolbox'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/flyout_vertical.js', ['Blockly.VerticalFlyout'], ['Blockly.Block', 'Blockly.DropDownDiv', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object', 'Blockly.utils.toolbox']);
-goog.addDependency('../../core/generator.js', ['Blockly.Generator'], ['Blockly.Block', 'Blockly.internalConstants', 'Blockly.utils.deprecation']);
+goog.addDependency('../../core/generator.js', ['Blockly.Generator'], ['Blockly', 'Blockly.internalConstants', 'Blockly.utils.deprecation'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/gesture.js', ['Blockly.Gesture'], ['Blockly.BlockDragger', 'Blockly.BubbleDragger', 'Blockly.Events', 'Blockly.Events.Click', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Workspace', 'Blockly.WorkspaceDragger', 'Blockly.blockAnimations', 'Blockly.browserEvents', 'Blockly.internalConstants', 'Blockly.utils', 'Blockly.utils.Coordinate']);
-goog.addDependency('../../core/grid.js', ['Blockly.Grid'], ['Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.userAgent']);
-goog.addDependency('../../core/icon.js', ['Blockly.Icon'], ['Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom']);
+goog.addDependency('../../core/grid.js', ['Blockly.Grid'], ['Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/icon.js', ['Blockly.Icon'], ['Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/inject.js', ['Blockly.inject'], ['Blockly.BlockDragSurfaceSvg', 'Blockly.Css', 'Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Grid', 'Blockly.Msg', 'Blockly.Options', 'Blockly.ScrollbarPair', 'Blockly.Tooltip', 'Blockly.WidgetDiv', 'Blockly.Workspace', 'Blockly.WorkspaceDragSurfaceSvg', 'Blockly.WorkspaceSvg', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Svg', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.userAgent']);
-goog.addDependency('../../core/input.js', ['Blockly.Input'], ['Blockly.Connection', 'Blockly.FieldLabel', 'Blockly.fieldRegistry', 'Blockly.inputTypes'], {'lang': 'es5'});
+goog.addDependency('../../core/input.js', ['Blockly.Input'], ['Blockly.Connection', 'Blockly.FieldLabel', 'Blockly.constants', 'Blockly.fieldRegistry', 'Blockly.inputTypes'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/input_types.js', ['Blockly.inputTypes'], ['Blockly.connectionTypes']);
 goog.addDependency('../../core/insertion_marker_manager.js', ['Blockly.InsertionMarkerManager'], ['Blockly.ComponentManager', 'Blockly.Events', 'Blockly.blockAnimations', 'Blockly.connectionTypes', 'Blockly.internalConstants'], {'lang': 'es5'});
 goog.addDependency('../../core/interfaces/i_ast_node_location.js', ['Blockly.IASTNodeLocation'], [], {'lang': 'es6', 'module': 'goog'});
@@ -91,7 +91,7 @@ goog.addDependency('../../core/interfaces/i_drag_target.js', ['Blockly.IDragTarg
 goog.addDependency('../../core/interfaces/i_draggable.js', ['Blockly.IDraggable'], ['Blockly.IDeletable'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_flyout.js', ['Blockly.IFlyout'], ['Blockly.IRegistrable'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_keyboard_accessible.js', ['Blockly.IKeyboardAccessible'], [], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/interfaces/i_metrics_manager.js', ['Blockly.IMetricsManager'], []);
+goog.addDependency('../../core/interfaces/i_metrics_manager.js', ['Blockly.IMetricsManager'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_movable.js', ['Blockly.IMovable'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_positionable.js', ['Blockly.IPositionable'], ['Blockly.IComponent'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_registrable.js', ['Blockly.IRegistrable'], [], {'lang': 'es6', 'module': 'goog'});
@@ -108,7 +108,7 @@ goog.addDependency('../../core/keyboard_nav/cursor.js', ['Blockly.Cursor'], ['Bl
 goog.addDependency('../../core/keyboard_nav/marker.js', ['Blockly.Marker'], ['Blockly.ASTNode']);
 goog.addDependency('../../core/keyboard_nav/tab_navigate_cursor.js', ['Blockly.TabNavigateCursor'], ['Blockly.ASTNode', 'Blockly.BasicCursor', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/marker_manager.js', ['Blockly.MarkerManager'], ['Blockly.Cursor', 'Blockly.Marker']);
-goog.addDependency('../../core/menu.js', ['Blockly.Menu'], ['Blockly.browserEvents', 'Blockly.utils.Coordinate', 'Blockly.utils.KeyCodes', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.style']);
+goog.addDependency('../../core/menu.js', ['Blockly.Menu'], ['Blockly.browserEvents', 'Blockly.utils.Coordinate', 'Blockly.utils.KeyCodes', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.style'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/menuitem.js', ['Blockly.MenuItem'], ['Blockly.utils.IdGenerator', 'Blockly.utils.aria', 'Blockly.utils.dom']);
 goog.addDependency('../../core/metrics_manager.js', ['Blockly.FlyoutMetricsManager', 'Blockly.MetricsManager'], ['Blockly.IMetricsManager', 'Blockly.registry', 'Blockly.utils.Size', 'Blockly.utils.toolbox'], {'lang': 'es5'});
 goog.addDependency('../../core/msg.js', ['Blockly.Msg'], ['Blockly.utils.global']);