Sort requires (#4658)

* Cleanup gulp method to sort requires

core/block.js

@@ -26,8 +26,8 @@ goog.require('Blockly.fieldRegistry');
 goog.require('Blockly.Input');
 goog.require('Blockly.Tooltip');
 goog.require('Blockly.utils');
-goog.require('Blockly.utils.deprecation');
 goog.require('Blockly.utils.Coordinate');
+goog.require('Blockly.utils.deprecation');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.Size');
 goog.require('Blockly.utils.string');

core/block_animations.js

@@ -17,6 +17,7 @@ goog.require('Blockly.utils.Svg');
 
 goog.requireType('Blockly.BlockSvg');
 
+
 /**
  * PID of disconnect UI animation.  There can only be one at a time.
  * @type {number}

core/block_dragger.js

@@ -15,8 +15,8 @@ goog.provide('Blockly.BlockDragger');
 goog.require('Blockly.blockAnimations');
 goog.require('Blockly.constants');
 goog.require('Blockly.Events');
-goog.require('Blockly.Events.BlockMove');
 goog.require('Blockly.Events.BlockDrag');
+goog.require('Blockly.Events.BlockMove');
 goog.require('Blockly.InsertionMarkerManager');
 goog.require('Blockly.utils.Coordinate');
 goog.require('Blockly.utils.dom');

core/block_svg.js

@@ -29,8 +29,8 @@ goog.require('Blockly.TabNavigateCursor');
 goog.require('Blockly.Tooltip');
 goog.require('Blockly.Touch');
 goog.require('Blockly.utils');
-goog.require('Blockly.utils.deprecation');
 goog.require('Blockly.utils.Coordinate');
+goog.require('Blockly.utils.deprecation');
 goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.Rect');

core/blockly.js

@@ -16,14 +16,14 @@
  */
 goog.provide('Blockly');
 
-goog.require('Blockly.constants');
 goog.require('Blockly.browserEvents');
+goog.require('Blockly.constants');
 goog.require('Blockly.Events');
 goog.require('Blockly.Events.BlockCreate');
 goog.require('Blockly.Events.FinishedLoading');
-goog.require('Blockly.Events.VarCreate');
 goog.require('Blockly.Events.Ui');
 goog.require('Blockly.Events.UiBase');
+goog.require('Blockly.Events.VarCreate');
 goog.require('Blockly.inject');
 goog.require('Blockly.Procedures');
 goog.require('Blockly.ShortcutRegistry');

core/contextmenu_items.js

@@ -21,6 +21,7 @@ goog.require('Blockly.Events');
 
 goog.requireType('Blockly.BlockSvg');
 
+
 /** Option to undo previous action. */
 Blockly.ContextMenuItems.registerUndo = function() {
   /** @type {!Blockly.ContextMenuRegistry.RegistryItem} */

core/events/events_selected.js

@@ -17,6 +17,7 @@ goog.require('Blockly.Events.UiBase');
 goog.require('Blockly.registry');
 goog.require('Blockly.utils.object');
 
+
 /**
  * Class for a selected event.
  * @param {?string=} opt_oldElementId The id of the previously selected

core/events/events_theme_change.js

@@ -17,6 +17,7 @@ goog.require('Blockly.Events.UiBase');
 goog.require('Blockly.registry');
 goog.require('Blockly.utils.object');
 
+
 /**
  * Class for a theme change event.
  * @param {string=} opt_themeName The theme name. Undefined for a blank event.

core/events/events_toolbox_item_select.js

@@ -17,6 +17,7 @@ goog.require('Blockly.Events.UiBase');
 goog.require('Blockly.registry');
 goog.require('Blockly.utils.object');
 
+
 /**
  * Class for a toolbox item select event.
  * @param {?string=} opt_oldItem The previously selected toolbox item. Undefined

core/events/events_trashcan_open.js

@@ -17,6 +17,7 @@ goog.require('Blockly.Events.UiBase');
 goog.require('Blockly.registry');
 goog.require('Blockly.utils.object');
 
+
 /**
  * Class for a trashcan open event.
  * @param {boolean=} opt_isOpen Whether the trashcan flyout is opening (false if

core/events/events_viewport.js

@@ -17,6 +17,7 @@ goog.require('Blockly.Events.UiBase');
 goog.require('Blockly.registry');
 goog.require('Blockly.utils.object');
 
+
 /**
  * Class for a viewport change event.
  * @param {number=} opt_top Top-edge of the visible portion of the workspace,

core/field_colour.js

@@ -29,6 +29,7 @@ goog.require('Blockly.utils.Size');
 
 goog.requireType('Blockly.ShortcutRegistry');
 
+
 /**
  * Class for a colour input field.
  * @param {string=} opt_value The initial value of the field. Should be in

core/generator.js

@@ -13,8 +13,8 @@
 
 goog.provide('Blockly.Generator');
 
-goog.require('Blockly.constants');
 goog.require('Blockly.Block');
+goog.require('Blockly.constants');
 
 goog.requireType('Blockly.Names');
 goog.requireType('Blockly.Workspace');

core/interfaces/i_flyout.js

@@ -15,8 +15,8 @@ goog.provide('Blockly.IFlyout');
 
 goog.requireType('Blockly.BlockSvg');
 goog.requireType('Blockly.IRegistrable');
-goog.requireType('Blockly.utils.dom');
 goog.requireType('Blockly.utils.Coordinate');
+goog.requireType('Blockly.utils.dom');
 goog.requireType('Blockly.utils.Svg');
 goog.requireType('Blockly.utils.toolbox');
 goog.requireType('Blockly.WorkspaceSvg');

core/interfaces/i_metrics_manager.js

@@ -17,9 +17,9 @@ goog.requireType('Blockly.IFlyout');
 goog.requireType('Blockly.IToolbox');
 goog.requireType('Blockly.MetricsManager');
 goog.requireType('Blockly.utils.Metrics');
+goog.requireType('Blockly.utils.Size');
 goog.requireType('Blockly.utils.toolbox');
 
-goog.requireType('Blockly.utils.Size');
 
 /**
  * Interface for a metrics manager.

core/options.js

@@ -12,9 +12,9 @@
 
 goog.provide('Blockly.Options');
 
+goog.require('Blockly.registry');
 goog.require('Blockly.Theme');
 goog.require('Blockly.Themes.Classic');
-goog.require('Blockly.registry');
 goog.require('Blockly.utils.IdGenerator');
 goog.require('Blockly.utils.Metrics');
 goog.require('Blockly.utils.toolbox');

core/registry.js

@@ -14,16 +14,15 @@
 goog.provide('Blockly.registry');
 
 goog.requireType('Blockly.blockRendering.Renderer');
+goog.requireType('Blockly.Cursor');
 goog.requireType('Blockly.Events.Abstract');
 goog.requireType('Blockly.Field');
 goog.requireType('Blockly.IConnectionChecker');
 goog.requireType('Blockly.IFlyout');
 goog.requireType('Blockly.IToolbox');
-goog.requireType('Blockly.Theme');
-
-goog.requireType('Blockly.Cursor');
 goog.requireType('Blockly.MetricsManager');
 goog.requireType('Blockly.Options');
+goog.requireType('Blockly.Theme');
 goog.requireType('Blockly.ToolboxItem');
 
 

core/renderers/common/constants.js

@@ -24,6 +24,7 @@ goog.requireType('Blockly.blockRendering.Debug');
 goog.requireType('Blockly.RenderedConnection');
 goog.requireType('Blockly.Theme');
 
+
 /**
  * An object that provides constants for rendering blocks.
  * @constructor

core/renderers/common/drawer.js

@@ -23,9 +23,9 @@ goog.require('Blockly.blockRendering.Types');
 goog.require('Blockly.utils.svgPaths');
 
 goog.requireType('Blockly.blockRendering.ConstantProvider');
+goog.requireType('Blockly.blockRendering.Field');
 goog.requireType('Blockly.blockRendering.Icon');
 goog.requireType('Blockly.blockRendering.InlineInput');
-goog.requireType('Blockly.blockRendering.Field');
 goog.requireType('Blockly.BlockSvg');
 
 

core/renderers/common/i_path_object.js

@@ -14,9 +14,9 @@
 
 goog.provide('Blockly.blockRendering.IPathObject');
 
+goog.requireType('Blockly.Block');
 goog.requireType('Blockly.blockRendering.ConstantProvider');
 goog.requireType('Blockly.Theme');
-goog.requireType('Blockly.Block');
 
 
 /**

core/renderers/common/info.js

@@ -16,8 +16,8 @@ goog.require('Blockly.blockRendering.BottomRow');
 goog.require('Blockly.blockRendering.ExternalValueInput');
 goog.require('Blockly.blockRendering.Hat');
 goog.require('Blockly.blockRendering.InlineInput');
-goog.require('Blockly.blockRendering.InRowSpacer');
 goog.require('Blockly.blockRendering.InputRow');
+goog.require('Blockly.blockRendering.InRowSpacer');
 goog.require('Blockly.blockRendering.Measurable');
 goog.require('Blockly.blockRendering.NextConnection');
 goog.require('Blockly.blockRendering.OutputConnection');
@@ -25,8 +25,8 @@ goog.require('Blockly.blockRendering.PreviousConnection');
 goog.require('Blockly.blockRendering.RoundCorner');
 goog.require('Blockly.blockRendering.Row');
 goog.require('Blockly.blockRendering.SpacerRow');
-goog.require('Blockly.blockRendering.StatementInput');
 goog.require('Blockly.blockRendering.SquareCorner');
+goog.require('Blockly.blockRendering.StatementInput');
 goog.require('Blockly.blockRendering.TopRow');
 goog.require('Blockly.blockRendering.Types');
 goog.require('Blockly.constants');

core/renderers/common/renderer.js

@@ -15,8 +15,8 @@ goog.provide('Blockly.blockRendering.Renderer');
 goog.require('Blockly.blockRendering.ConstantProvider');
 goog.require('Blockly.blockRendering.Debug');
 goog.require('Blockly.blockRendering.Drawer');
-goog.require('Blockly.blockRendering.MarkerSvg');
 goog.require('Blockly.blockRendering.IPathObject');
+goog.require('Blockly.blockRendering.MarkerSvg');
 goog.require('Blockly.blockRendering.PathObject');
 goog.require('Blockly.blockRendering.RenderInfo');
 goog.require('Blockly.constants');

core/renderers/geras/drawer.js

@@ -19,8 +19,8 @@ goog.require('Blockly.geras.RenderInfo');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.svgPaths');
 
-goog.requireType('Blockly.geras.PathObject');
 goog.requireType('Blockly.BlockSvg');
+goog.requireType('Blockly.geras.PathObject');
 
 
 /**

core/renderers/geras/info.js

@@ -15,29 +15,29 @@ goog.provide('Blockly.geras');
 goog.provide('Blockly.geras.RenderInfo');
 
 goog.require('Blockly.blockRendering.BottomRow');
+goog.require('Blockly.blockRendering.BottomRow');
+goog.require('Blockly.blockRendering.ExternalValueInput');
+goog.require('Blockly.blockRendering.InputRow');
 goog.require('Blockly.blockRendering.InputRow');
 goog.require('Blockly.blockRendering.InRowSpacer');
 goog.require('Blockly.blockRendering.Measurable');
-goog.require('Blockly.blockRendering.NextConnection');
-goog.require('Blockly.blockRendering.OutputConnection');
-goog.require('Blockly.blockRendering.PreviousConnection');
-goog.require('Blockly.blockRendering.RenderInfo');
-goog.require('Blockly.blockRendering.BottomRow');
-goog.require('Blockly.blockRendering.InputRow');
 goog.require('Blockly.blockRendering.Measurable');
 goog.require('Blockly.blockRendering.NextConnection');
+goog.require('Blockly.blockRendering.NextConnection');
+goog.require('Blockly.blockRendering.OutputConnection');
 goog.require('Blockly.blockRendering.OutputConnection');
 goog.require('Blockly.blockRendering.PreviousConnection');
+goog.require('Blockly.blockRendering.PreviousConnection');
+goog.require('Blockly.blockRendering.RenderInfo');
 goog.require('Blockly.blockRendering.Types');
-goog.require('Blockly.blockRendering.ExternalValueInput');
 goog.require('Blockly.constants');
 goog.require('Blockly.geras.InlineInput');
 goog.require('Blockly.geras.StatementInput');
 goog.require('Blockly.utils.object');
 
-goog.requireType('Blockly.geras.Renderer');
-goog.requireType('Blockly.BlockSvg');
 goog.requireType('Blockly.blockRendering.Field');
+goog.requireType('Blockly.BlockSvg');
+goog.requireType('Blockly.geras.Renderer');
 
 
 /**

core/renderers/geras/measurables/inputs.js

@@ -14,9 +14,9 @@
 goog.provide('Blockly.geras.InlineInput');
 goog.provide('Blockly.geras.StatementInput');
 
-goog.require('Blockly.utils.object');
 goog.require('Blockly.blockRendering.InlineInput');
 goog.require('Blockly.blockRendering.StatementInput');
+goog.require('Blockly.utils.object');
 
 goog.requireType('Blockly.blockRendering.ConstantProvider');
 goog.requireType('Blockly.Input');

core/renderers/geras/renderer.js

@@ -21,13 +21,12 @@ goog.require('Blockly.geras.PathObject');
 goog.require('Blockly.geras.RenderInfo');
 goog.require('Blockly.utils.object');
 
-goog.requireType('Blockly.blockRendering.RenderInfo');
 goog.requireType('Blockly.blockRendering.ConstantProvider');
+goog.requireType('Blockly.blockRendering.RenderInfo');
 goog.requireType('Blockly.BlockSvg');
 goog.requireType('Blockly.Theme');
 
 
-
 /**
  * The geras renderer.
  * @param {string} name The renderer name.

core/renderers/minimalist/drawer.js

@@ -12,8 +12,8 @@
 goog.provide('Blockly.minimalist.Drawer');
 
 goog.require('Blockly.blockRendering.Drawer');
-goog.require('Blockly.utils.object');
 goog.require('Blockly.minimalist.RenderInfo');
+goog.require('Blockly.utils.object');
 
 
 /**

core/renderers/minimalist/renderer.js

@@ -13,10 +13,10 @@ goog.provide('Blockly.minimalist.Renderer');
 
 goog.require('Blockly.blockRendering');
 goog.require('Blockly.blockRendering.Renderer');
-goog.require('Blockly.utils.object');
 goog.require('Blockly.minimalist.ConstantProvider');
 goog.require('Blockly.minimalist.Drawer');
 goog.require('Blockly.minimalist.RenderInfo');
+goog.require('Blockly.utils.object');
 
 
 /**

core/renderers/thrasos/info.js

@@ -17,8 +17,8 @@ goog.provide('Blockly.thrasos.RenderInfo');
 goog.require('Blockly.blockRendering.BottomRow');
 goog.require('Blockly.blockRendering.ExternalValueInput');
 goog.require('Blockly.blockRendering.InlineInput');
-goog.require('Blockly.blockRendering.InRowSpacer');
 goog.require('Blockly.blockRendering.InputRow');
+goog.require('Blockly.blockRendering.InRowSpacer');
 goog.require('Blockly.blockRendering.Measurable');
 goog.require('Blockly.blockRendering.NextConnection');
 goog.require('Blockly.blockRendering.OutputConnection');

core/renderers/zelos/drawer.js

@@ -19,8 +19,8 @@ goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.svgPaths');
 goog.require('Blockly.zelos.RenderInfo');
 
-goog.requireType('Blockly.BlockSvg');
 goog.requireType('Blockly.blockRendering.Row');
+goog.requireType('Blockly.BlockSvg');
 goog.requireType('Blockly.zelos.PathObject');
 
 

core/renderers/zelos/info.js

@@ -26,8 +26,8 @@ goog.require('Blockly.blockRendering.PreviousConnection');
 goog.require('Blockly.blockRendering.RenderInfo');
 goog.require('Blockly.blockRendering.RoundCorner');
 goog.require('Blockly.blockRendering.Row');
-goog.require('Blockly.blockRendering.SquareCorner');
 goog.require('Blockly.blockRendering.SpacerRow');
+goog.require('Blockly.blockRendering.SquareCorner');
 goog.require('Blockly.blockRendering.TopRow');
 goog.require('Blockly.blockRendering.Types');
 goog.require('Blockly.constants');

core/renderers/zelos/measurables/rows.js

@@ -15,8 +15,8 @@ goog.provide('Blockly.zelos.BottomRow');
 goog.provide('Blockly.zelos.TopRow');
 
 goog.require('Blockly.blockRendering.BottomRow');
-goog.require('Blockly.blockRendering.TopRow');
 goog.require('Blockly.blockRendering.SpacerRow');
+goog.require('Blockly.blockRendering.TopRow');
 goog.require('Blockly.utils.object');
 
 goog.requireType('Blockly.blockRendering.ConstantProvider');

core/renderers/zelos/path_object.js

@@ -14,10 +14,10 @@
 goog.provide('Blockly.zelos.PathObject');
 
 goog.require('Blockly.blockRendering.PathObject');
-goog.require('Blockly.zelos.ConstantProvider');
 goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.Svg');
+goog.require('Blockly.zelos.ConstantProvider');
 
 goog.requireType('Blockly.Theme');
 

core/renderers/zelos/renderer.js

@@ -19,9 +19,9 @@ goog.require('Blockly.InsertionMarkerManager');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.zelos.ConstantProvider');
 goog.require('Blockly.zelos.Drawer');
+goog.require('Blockly.zelos.MarkerSvg');
 goog.require('Blockly.zelos.PathObject');
 goog.require('Blockly.zelos.RenderInfo');
-goog.require('Blockly.zelos.MarkerSvg');
 
 goog.requireType('Blockly.blockRendering.MarkerSvg');
 goog.requireType('Blockly.blockRendering.RenderInfo');

core/toolbox/category.js

@@ -13,12 +13,12 @@
 goog.provide('Blockly.ToolboxCategory');
 
 goog.require('Blockly.registry');
+goog.require('Blockly.ToolboxItem');
 goog.require('Blockly.utils');
 goog.require('Blockly.utils.aria');
 goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.toolbox');
-goog.require('Blockly.ToolboxItem');
 
 goog.requireType('Blockly.ICollapsibleToolboxItem');
 goog.requireType('Blockly.IToolbox');

core/toolbox/collapsible_category.js

@@ -14,12 +14,12 @@ goog.provide('Blockly.CollapsibleToolboxCategory');
 
 goog.require('Blockly.registry');
 goog.require('Blockly.ToolboxCategory');
+goog.require('Blockly.ToolboxItem');
 goog.require('Blockly.ToolboxSeparator');
 goog.require('Blockly.utils.aria');
 goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.utils.toolbox');
-goog.require('Blockly.ToolboxItem');
 
 goog.requireType('Blockly.ICollapsibleToolboxItem');
 goog.requireType('Blockly.IToolbox');

core/toolbox/toolbox.js

@@ -26,10 +26,10 @@ goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.Rect');
 goog.require('Blockly.utils.toolbox');
 
-goog.requireType('Blockly.IKeyboardAccessible');
 goog.requireType('Blockly.ICollapsibleToolboxItem');
 goog.requireType('Blockly.IDeleteArea');
 goog.requireType('Blockly.IFlyout');
+goog.requireType('Blockly.IKeyboardAccessible');
 goog.requireType('Blockly.ISelectableToolboxItem');
 goog.requireType('Blockly.IStyleable');
 goog.requireType('Blockly.IToolbox');

core/toolbox/toolbox_item.js

@@ -18,6 +18,7 @@ goog.requireType('Blockly.IToolboxItem');
 goog.requireType('Blockly.utils.toolbox');
 goog.requireType('Blockly.WorkspaceSvg');
 
+
 /**
  * Class for an item in the toolbox.
  * @param {!Blockly.utils.toolbox.ToolboxItemInfo} toolboxItemDef The JSON defining the

core/tooltip.js

@@ -24,6 +24,7 @@ goog.provide('Blockly.Tooltip');
 goog.require('Blockly.browserEvents');
 goog.require('Blockly.utils.string');
 
+
 /**
  * A type which can define a tooltip.
  * Either a string, an object containing a tooltip property, or a function which

core/utils.js

@@ -18,8 +18,8 @@
  */
 goog.provide('Blockly.utils');
 
-goog.require('Blockly.Msg');
 goog.require('Blockly.constants');
+goog.require('Blockly.Msg');
 goog.require('Blockly.utils.colour');
 goog.require('Blockly.utils.Coordinate');
 goog.require('Blockly.utils.global');

core/variables_dynamic.js

@@ -13,11 +13,11 @@
 
 goog.provide('Blockly.VariablesDynamic');
 
-goog.require('Blockly.Variables');
 goog.require('Blockly.Blocks');
 goog.require('Blockly.Msg');
 goog.require('Blockly.utils.xml');
 goog.require('Blockly.VariableModel');
+goog.require('Blockly.Variables');
 
 goog.requireType('Blockly.Workspace');
 

core/workspace_comment_svg.js

@@ -30,6 +30,7 @@ goog.requireType('Blockly.IBoundedElement');
 goog.requireType('Blockly.IBubble');
 goog.requireType('Blockly.ICopyable');
 
+
 /**
  * Class for a workspace comment's SVG representation.
  * @param {!Blockly.Workspace} workspace The block's workspace.

core/workspace_svg.js

@@ -12,12 +12,12 @@
 
 goog.provide('Blockly.WorkspaceSvg');
 
-goog.require('Blockly.BlockSvg');
 goog.require('Blockly.blockRendering');
+goog.require('Blockly.BlockSvg');
+goog.require('Blockly.browserEvents');
 goog.require('Blockly.ConnectionDB');
 goog.require('Blockly.constants');
 goog.require('Blockly.ContextMenuRegistry');
-goog.require('Blockly.browserEvents');
 goog.require('Blockly.Events');
 goog.require('Blockly.Events.BlockCreate');
 goog.require('Blockly.Events.ThemeChange');

core/xml.js

@@ -28,8 +28,8 @@ goog.requireType('Blockly.Block');
 goog.requireType('Blockly.Comment');
 goog.requireType('Blockly.Connection');
 goog.requireType('Blockly.Field');
-goog.requireType('Blockly.Workspace');
 goog.requireType('Blockly.VariableModel');
+goog.requireType('Blockly.Workspace');
 
 
 /**

core/zoom_controls.js

@@ -24,6 +24,7 @@ goog.require('Blockly.utils.Svg');
 
 goog.requireType('Blockly.WorkspaceSvg');
 
+
 /**
  * Class for a zoom controls.
  * @param {!Blockly.WorkspaceSvg} workspace The workspace to sit in.

gulpfile.js

@@ -18,6 +18,7 @@ var gitTasks = require('./scripts/gulpfiles/git_tasks');
 var licenseTasks = require('./scripts/gulpfiles/license_tasks');
 var appengineTasks = require('./scripts/gulpfiles/appengine_tasks');
 var releaseTasks = require('./scripts/gulpfiles/release_tasks');
+var cleanupTasks = require('./scripts/gulpfiles/cleanup_tasks');
 
 module.exports = {
   deployDemos: appengineTasks.deployDemos,
@@ -40,4 +41,5 @@ module.exports = {
   recompile: releaseTasks.recompile,
   publish: releaseTasks.publish,
   publishBeta: releaseTasks.publishBeta,
+  sortRequires: cleanupTasks.sortRequires,
 };

package.json

@@ -31,6 +31,7 @@
     "bump": "npm --no-git-tag-version version 4.$(date +'%Y%m%d').0",
     "deployDemos": "gulp deployDemos",
     "format": "git-clang-format",
+    "format:sortrequires": "gulp sortRequires",
     "license": "gulp checkLicenses",
     "lint": "eslint .",
     "package": "gulp package",

scripts/gulpfiles/cleanup_tasks.js

@@ -0,0 +1,85 @@
+/**
+ * @license
+ * Copyright 2018 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Gulp tasks to complete various clean up tasks.
+ */
+
+const gulp = require('gulp');
+const path = require('path');
+const through2 = require('through2');
+
+/**
+ * Sorts goog.requires in core, blocks and generators.
+ */
+function sortRequires() {
+  const srcs = ['core/**/**/*.js', 'blocks/*.js', 'generators/**/*.js'];
+  const excludes = ['core/requires.js'];
+  return gulp.src(srcs, {base: './'})
+      .pipe(through2.obj((file, _enc, next) => {
+        if (file.isNull() || file.isDirectory()) {
+          next(null, file);
+          return;
+        }
+
+        if (file.extname !== '.js' && path.extname(file.history[0]) !== '.js') {
+          next(null, file);
+          return;
+        }
+
+        const relPath = path.relative(path.join(file.cwd, file.base), file.path);
+        if (excludes.indexOf(relPath) > -1) {
+          next(null, file);
+          return;
+        }
+
+        const contents = file.contents.toString();
+
+        // Capture requires.
+        const re = /goog\.(require|requireType)\('(.*)'\);/gm;
+        const requiresList = [];
+        const requireTypesList = [];
+        let firstIndex;
+        let lastIndex;
+        while ((match = re.exec(contents)) != null) {
+          if (match[1] == 'require') requiresList.push(match[2]);
+          if (match[1] == 'requireType') requireTypesList.push(match[2]);
+          if (firstIndex == undefined) {
+            firstIndex = match.index;
+          } else {
+            lastIndex = re.lastIndex;
+          }
+        }
+
+        // Sort requires.
+        requiresList.sort(
+            (a, b) => a.toLowerCase().localeCompare(b.toLowerCase()));
+        requireTypesList.sort(
+            (a, b) => a.toLowerCase().localeCompare(b.toLowerCase()));
+
+        // Replace in file.
+        const requiresSection = requiresList.length ?
+            requiresList.map(r => `goog.require('${r}');`).join('\n') + '\n\n' :
+            '';
+        const requireTypesSection = requireTypesList.length ?
+            requireTypesList.map(r => `goog.requireType('${r}');`).join('\n') +
+                '\n\n' :
+            '';
+        const requires = `${requiresSection}${requireTypesSection}\n`;
+
+        if (firstIndex != undefined & lastIndex != undefined) {
+          file.contents = Buffer.from(
+              contents.substring(0, firstIndex) + requires +
+              contents.substring(lastIndex).trimStart());
+        }
+        next(null, file);
+      }))
+      .pipe(gulp.dest('./'));
+};
+
+module.exports = {
+  sortRequires: sortRequires
+};