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/tests/deps.js b/tests/deps.js
index 932910c7e..de575339f 100644
--- a/tests/deps.js
+++ b/tests/deps.js
@@ -68,7 +68,7 @@ goog.addDependency('../../core/flyout_vertical.js', ['Blockly.VerticalFlyout'],
 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'], {'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']);
+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_types.js', ['Blockly.inputTypes'], ['Blockly.connectionTypes']);