diff --git a/core/connection_checker.js b/core/connection_checker.js
index 5dcaef376..8b2abfaab 100644
--- a/core/connection_checker.js
+++ b/core/connection_checker.js
@@ -16,10 +16,10 @@ goog.module.declareLegacyNamespace();
 
 const Connection = goog.require('Blockly.Connection');
 const IConnectionChecker = goog.require('Blockly.IConnectionChecker');
-const {OPPOSITE_TYPE} = goog.require('Blockly.internalConstants');
 const RenderedConnection = goog.requireType('Blockly.RenderedConnection');
 const connectionTypes = goog.require('Blockly.connectionTypes');
 const registry = goog.require('Blockly.registry');
+const {OPPOSITE_TYPE} = goog.require('Blockly.internalConstants');
 
 
 /**
diff --git a/core/internal_constants.js b/core/internal_constants.js
index b5a8cd568..b97c723b4 100644
--- a/core/internal_constants.js
+++ b/core/internal_constants.js
@@ -8,6 +8,7 @@
  * @fileoverview Module that provides constants for use inside Blockly. Do not
  * use these constants outside of the core library.
  * @author fenichel@google.com (Rachel Fenichel)
+ * @package
  */
 'use strict';
 
diff --git a/tests/deps.js b/tests/deps.js
index 2d1386395..74d330e51 100644
--- a/tests/deps.js
+++ b/tests/deps.js
@@ -29,7 +29,7 @@ goog.addDependency('../../core/contextmenu_items.js', ['Blockly.ContextMenuItems
 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/drag_target.js', ['Blockly.DragTarget'], ['Blockly.IDragTarget']);
+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']);
 goog.addDependency('../../core/events/events.js', ['Blockly.Events'], ['Blockly.registry', 'Blockly.utils']);
@@ -48,9 +48,9 @@ goog.addDependency('../../core/events/variable_events.js', ['Blockly.Events.VarB
 goog.addDependency('../../core/events/workspace_events.js', ['Blockly.Events.FinishedLoading'], ['Blockly.Events', 'Blockly.Events.Abstract', 'Blockly.registry', 'Blockly.utils.object'], {'lang': 'es5'});
 goog.addDependency('../../core/events/ws_comment_events.js', ['Blockly.Events.CommentBase', 'Blockly.Events.CommentChange', 'Blockly.Events.CommentCreate', 'Blockly.Events.CommentDelete', 'Blockly.Events.CommentMove'], ['Blockly.Events', 'Blockly.Events.Abstract', 'Blockly.Xml', 'Blockly.registry', 'Blockly.utils.Coordinate', 'Blockly.utils.object', 'Blockly.utils.xml']);
 goog.addDependency('../../core/extensions.js', ['Blockly.Extensions'], ['Blockly.utils'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/field.js', ['Blockly.Field'], ['Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Gesture', 'Blockly.IASTNodeLocationSvg', 'Blockly.IASTNodeLocationWithBlock', 'Blockly.IKeyboardAccessible', 'Blockly.IRegistrable', 'Blockly.MarkerManager', 'Blockly.Tooltip', 'Blockly.WidgetDiv', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.style', 'Blockly.utils.userAgent'], {'lang': 'es5'});
+goog.addDependency('../../core/field.js', ['Blockly.Field'], ['Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Gesture', 'Blockly.IASTNodeLocationSvg', 'Blockly.IASTNodeLocationWithBlock', 'Blockly.IKeyboardAccessible', 'Blockly.IRegistrable', 'Blockly.MarkerManager', 'Blockly.Tooltip', 'Blockly.WidgetDiv', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.style', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/field_angle.js', ['Blockly.FieldAngle'], ['Blockly.Css', 'Blockly.DropDownDiv', 'Blockly.FieldTextInput', 'Blockly.WidgetDiv', 'Blockly.browserEvents', 'Blockly.fieldRegistry', 'Blockly.utils.KeyCodes', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.object', 'Blockly.utils.userAgent']);
-goog.addDependency('../../core/field_checkbox.js', ['Blockly.FieldCheckbox'], ['Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.fieldRegistry', 'Blockly.utils.dom', 'Blockly.utils.object']);
+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']);
 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']);
 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']);
@@ -80,6 +80,7 @@ goog.addDependency('../../core/interfaces/i_autohideable.js', ['Blockly.IAutoHid
 goog.addDependency('../../core/interfaces/i_block_dragger.js', ['Blockly.IBlockDragger'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_bounded_element.js', ['Blockly.IBoundedElement'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_bubble.js', ['Blockly.IBubble'], ['Blockly.IContextMenu', 'Blockly.IDraggable'], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/interfaces/i_collapsible_toolbox_item.js', ['Blockly.ICollapsibleToolboxItem'], ['Blockly.ISelectableToolboxItem'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_component.js', ['Blockly.IComponent'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_connection_checker.js', ['Blockly.IConnectionChecker'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_contextmenu.js', ['Blockly.IContextMenu'], [], {'lang': 'es6', 'module': 'goog'});
@@ -93,18 +94,19 @@ goog.addDependency('../../core/interfaces/i_keyboard_accessible.js', ['Blockly.I
 goog.addDependency('../../core/interfaces/i_metrics_manager.js', ['Blockly.IMetricsManager'], []);
 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'], []);
-goog.addDependency('../../core/interfaces/i_registrable_field.js', ['Blockly.IRegistrableField'], []);
+goog.addDependency('../../core/interfaces/i_registrable.js', ['Blockly.IRegistrable'], [], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/interfaces/i_registrable_field.js', ['Blockly.IRegistrableField'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_selectable.js', ['Blockly.ISelectable'], [], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/interfaces/i_selectable_toolbox_item.js', ['Blockly.ISelectableToolboxItem'], ['Blockly.IToolboxItem'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_styleable.js', ['Blockly.IStyleable'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/interfaces/i_toolbox.js', ['Blockly.IToolbox'], ['Blockly.IRegistrable'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/interfaces/i_toolbox_item.js', ['Blockly.ICollapsibleToolboxItem', 'Blockly.ISelectableToolboxItem', 'Blockly.IToolboxItem'], []);
+goog.addDependency('../../core/interfaces/i_toolbox_item.js', ['Blockly.IToolboxItem'], [], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/internal_constants.js', ['Blockly.internalConstants'], ['Blockly.connectionTypes'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/keyboard_nav/ast_node.js', ['Blockly.ASTNode'], ['Blockly.connectionTypes', 'Blockly.utils.Coordinate'], {'lang': 'es5'});
 goog.addDependency('../../core/keyboard_nav/basic_cursor.js', ['Blockly.BasicCursor'], ['Blockly.ASTNode', 'Blockly.Cursor', 'Blockly.registry', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/keyboard_nav/cursor.js', ['Blockly.Cursor'], ['Blockly.ASTNode', 'Blockly.Marker', 'Blockly.registry', 'Blockly.utils.object'], {'lang': 'es6', 'module': 'goog'});
 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']);
+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/menuitem.js', ['Blockly.MenuItem'], ['Blockly.utils.IdGenerator', 'Blockly.utils.aria', 'Blockly.utils.dom']);
@@ -122,7 +124,7 @@ goog.addDependency('../../core/renderers/common/constants.js', ['Blockly.blockRe
 goog.addDependency('../../core/renderers/common/debugger.js', ['Blockly.blockRendering.Debug'], ['Blockly.blockRendering.Measurable', 'Blockly.blockRendering.RenderInfo', 'Blockly.blockRendering.Row', 'Blockly.blockRendering.Types', 'Blockly.connectionTypes', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es5'});
 goog.addDependency('../../core/renderers/common/drawer.js', ['Blockly.blockRendering.Drawer'], ['Blockly.blockRendering.Row', 'Blockly.blockRendering.Types', 'Blockly.utils.svgPaths'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/renderers/common/i_path_object.js', ['Blockly.blockRendering.IPathObject'], []);
-goog.addDependency('../../core/renderers/common/info.js', ['Blockly.blockRendering.RenderInfo'], ['Blockly.blockRendering.BottomRow', 'Blockly.blockRendering.ExternalValueInput', 'Blockly.blockRendering.Field', 'Blockly.blockRendering.Hat', 'Blockly.blockRendering.InRowSpacer', 'Blockly.blockRendering.InlineInput', 'Blockly.blockRendering.InputRow', 'Blockly.blockRendering.JaggedEdge', 'Blockly.blockRendering.Measurable', 'Blockly.blockRendering.NextConnection', 'Blockly.blockRendering.OutputConnection', 'Blockly.blockRendering.PreviousConnection', 'Blockly.blockRendering.RoundCorner', 'Blockly.blockRendering.Row', 'Blockly.blockRendering.SpacerRow', 'Blockly.blockRendering.SquareCorner', 'Blockly.blockRendering.StatementInput', 'Blockly.blockRendering.TopRow', 'Blockly.blockRendering.Types', 'Blockly.inputTypes']);
+goog.addDependency('../../core/renderers/common/info.js', ['Blockly.blockRendering.RenderInfo'], ['Blockly.blockRendering.BottomRow', 'Blockly.blockRendering.ExternalValueInput', 'Blockly.blockRendering.Field', 'Blockly.blockRendering.Hat', 'Blockly.blockRendering.Icon', 'Blockly.blockRendering.InRowSpacer', 'Blockly.blockRendering.InlineInput', 'Blockly.blockRendering.InputRow', 'Blockly.blockRendering.JaggedEdge', 'Blockly.blockRendering.Measurable', 'Blockly.blockRendering.NextConnection', 'Blockly.blockRendering.OutputConnection', 'Blockly.blockRendering.PreviousConnection', 'Blockly.blockRendering.RoundCorner', 'Blockly.blockRendering.Row', 'Blockly.blockRendering.SpacerRow', 'Blockly.blockRendering.SquareCorner', 'Blockly.blockRendering.StatementInput', 'Blockly.blockRendering.TopRow', 'Blockly.blockRendering.Types', 'Blockly.constants', 'Blockly.inputTypes'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/renderers/common/marker_svg.js', ['Blockly.blockRendering.MarkerSvg'], ['Blockly.ASTNode', 'Blockly.Events', 'Blockly.Events.MarkerMove', 'Blockly.connectionTypes', 'Blockly.utils.Svg', 'Blockly.utils.dom']);
 goog.addDependency('../../core/renderers/common/path_object.js', ['Blockly.blockRendering.PathObject'], ['Blockly.Theme', 'Blockly.blockRendering.ConstantProvider', 'Blockly.blockRendering.IPathObject', 'Blockly.utils.Svg', 'Blockly.utils.dom']);
 goog.addDependency('../../core/renderers/common/renderer.js', ['Blockly.blockRendering.Renderer'], ['Blockly.IRegistrable', 'Blockly.InsertionMarkerManager', 'Blockly.blockRendering.ConstantProvider', 'Blockly.blockRendering.Debug', 'Blockly.blockRendering.Drawer', 'Blockly.blockRendering.IPathObject', 'Blockly.blockRendering.MarkerSvg', 'Blockly.blockRendering.PathObject', 'Blockly.blockRendering.RenderInfo', 'Blockly.connectionTypes']);
@@ -190,7 +192,7 @@ goog.addDependency('../../core/utils/string.js', ['Blockly.utils.string'], []);
 goog.addDependency('../../core/utils/style.js', ['Blockly.utils.style'], ['Blockly.utils.Coordinate', 'Blockly.utils.Size'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/utils/svg.js', ['Blockly.utils.Svg'], []);
 goog.addDependency('../../core/utils/svg_paths.js', ['Blockly.utils.svgPaths'], [], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/utils/toolbox.js', ['Blockly.utils.toolbox'], ['Blockly.Xml', 'Blockly.constants']);
+goog.addDependency('../../core/utils/toolbox.js', ['Blockly.utils.toolbox'], ['Blockly.Xml', 'Blockly.utils.userAgent'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/utils/useragent.js', ['Blockly.utils.userAgent'], ['Blockly.utils.global']);
 goog.addDependency('../../core/utils/xml.js', ['Blockly.utils.xml'], []);
 goog.addDependency('../../core/variable_map.js', ['Blockly.VariableMap'], ['Blockly.Events', 'Blockly.Events.VarDelete', 'Blockly.Events.VarRename', 'Blockly.Msg', 'Blockly.utils', 'Blockly.utils.object']);