feat: export `MergeDuplicateChunks` plugin

declarations/plugins/BannerPlugin.d.ts

@@ -51,7 +51,7 @@ export interface BannerPluginOptions {
 	 */
 	raw?: boolean;
 	/**
-	 * Specifies the banner.
+	 * Specifies the stage when add a banner.
 	 */
 	stage?: number;
 	/**

lib/index.js

@@ -443,6 +443,9 @@ module.exports = mergeExports(fn, {
 		get LimitChunkCountPlugin() {
 			return require("./optimize/LimitChunkCountPlugin");
 		},
+		get MergeDuplicateChunksPlugin() {
+			return require("./optimize/MergeDuplicateChunksPlugin.js");
+		},
 		get MinChunkSizePlugin() {
 			return require("./optimize/MinChunkSizePlugin");
 		},

lib/optimize/MergeDuplicateChunksPlugin.js

@@ -6,11 +6,27 @@
 "use strict";
 
 const { STAGE_BASIC } = require("../OptimizationStages");
+const createSchemaValidation = require("../util/create-schema-validation");
 const { runtimeEqual } = require("../util/runtime");
 
 /** @typedef {import("../Compiler")} Compiler */
 
+const validate = createSchemaValidation(
+	require("../../schemas/plugins/optimize/MergeDuplicateChunksPlugin.check.js"),
+	() =>
+		require("../../schemas/plugins/optimize/MergeDuplicateChunksPlugin.json"),
+	{
+		name: "Merge Duplicate Chunks Plugin",
+		baseDataPath: "options"
+	}
+);
+
 class MergeDuplicateChunksPlugin {
+	constructor(options = { stage: STAGE_BASIC }) {
+		validate(options);
+		this.options = options;
+	}
+
 	/**
 	 * @param {Compiler} compiler the compiler
 	 * @returns {void}
@@ -22,7 +38,7 @@ class MergeDuplicateChunksPlugin {
 				compilation.hooks.optimizeChunks.tap(
 					{
 						name: "MergeDuplicateChunksPlugin",
-						stage: STAGE_BASIC
+						stage: this.options.stage
 					},
 					chunks => {
 						const { chunkGraph, moduleGraph } = compilation;

schemas/plugins/BannerPlugin.json

@@ -90,7 +90,7 @@
           "type": "boolean"
         },
         "stage": {
-          "description": "Specifies the banner.",
+          "description": "Specifies the stage when add a banner.",
           "type": "number"
         },
         "test": {

schemas/plugins/optimize/MergeDuplicateChunksPlugin.json

@@ -0,0 +1,11 @@
+{
+  "title": "MergeDuplicateChunksPluginOptions",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "stage": {
+      "description": "Specifies the stage for merging duplicate chunks.",
+      "type": "number"
+    }
+  }
+}

test/__snapshots__/StatsTestCases.basictest.js.snap

@@ -4813,22 +4813,22 @@ assets by path *.wasm X KiB
   asset XXXXXXXXXXXXXXXXXXXX.module.wasm X bytes [emitted] [immutable]
   asset XXXXXXXXXXXXXXXXXXXX.module.wasm X bytes [emitted] [immutable]
   asset XXXXXXXXXXXXXXXXXXXX.module.wasm X bytes [emitted] [immutable]
-chunk (runtime: main) 573.bundle.js X bytes (javascript) X bytes (webassembly) [rendered] reused as split chunk (cache group: default)
+chunk (runtime: main) 573.bundle.js X bytes (javascript) X bytes (webassembly) [rendered]
   ./Q_rsqrt.wasm X bytes (javascript) X bytes (webassembly) [built] [code generated]
-chunk (runtime: main) 672.bundle.js X bytes (javascript) X bytes (webassembly) [rendered] reused as split chunk (cache group: default)
+chunk (runtime: main) 672.bundle.js X bytes (javascript) X bytes (webassembly) [rendered]
   ./duff.wasm X bytes (javascript) X bytes (webassembly) [built] [code generated]
 chunk (runtime: main) 787.bundle.js (id hint: vendors) X bytes [rendered] split chunk (cache group: defaultVendors)
   ./node_modules/env.js X bytes [built] [code generated]
 chunk (runtime: main) bundle.js (main) X bytes (javascript) X KiB (runtime) [entry] [rendered]
   runtime modules X KiB 11 modules
   ./index.js X bytes [built] [code generated]
-chunk (runtime: main) 836.bundle.js X KiB (javascript) X bytes (webassembly) [rendered] reused as split chunk (cache group: default)
+chunk (runtime: main) 836.bundle.js X KiB (javascript) X bytes (webassembly) [rendered]
   ./testFunction.wasm X bytes (javascript) X bytes (webassembly) [dependent] [built] [code generated]
   ./tests.js X KiB [built] [code generated]
-chunk (runtime: main) 946.bundle.js X bytes (javascript) X bytes (webassembly) [rendered] reused as split chunk (cache group: default)
+chunk (runtime: main) 946.bundle.js X bytes (javascript) X bytes (webassembly) [rendered]
   ./fact.wasm X bytes (javascript) X bytes (webassembly) [built] [code generated]
   ./fast-math.wasm X bytes (javascript) X bytes (webassembly) [built] [code generated]
-chunk (runtime: main) 989.bundle.js X bytes (javascript) X bytes (webassembly) [rendered] reused as split chunk (cache group: default)
+chunk (runtime: main) 989.bundle.js X bytes (javascript) X bytes (webassembly) [rendered]
   ./popcnt.wasm X bytes (javascript) X bytes (webassembly) [built] [code generated]
 runtime modules X KiB 11 modules
 cacheable modules X KiB (javascript) X KiB (webassembly)

test/statsCases/split-chunks-dedup/webpack.config.js

@@ -1,4 +1,5 @@
-const { ModuleFederationPlugin } = require("../../../").container;
+const webpack = require("../../../");
+const { ModuleFederationPlugin } = webpack.container;
 const {
 	WEBPACK_MODULE_TYPE_PROVIDE
 } = require("../../../lib/ModuleTypeConstants");
@@ -70,6 +71,9 @@ module.exports = {
 					requiredVersion: "=1.0.0"
 				}
 			}
+		}),
+		new webpack.optimize.MergeDuplicateChunksPlugin({
+			stage: 10
 		})
 	],
 	stats: {

types.d.ts

@@ -513,7 +513,7 @@ declare interface BannerPluginOptions {
 	raw?: boolean;
 
 	/**
-	 * Specifies the banner.
+	 * Specifies the stage when add a banner.
 	 */
 	stage?: number;
 
@@ -8643,6 +8643,11 @@ declare class MemoryCachePlugin {
 	 */
 	apply(compiler: Compiler): void;
 }
+declare class MergeDuplicateChunksPlugin {
+	constructor(options?: { stage: -10 });
+	options: { stage: -10 };
+	apply(compiler: Compiler): void;
+}
 declare class MinChunkSizePlugin {
 	constructor(options: MinChunkSizePluginOptions);
 	options: MinChunkSizePluginOptions;
@@ -16122,6 +16127,7 @@ declare namespace exports {
 			AggressiveMergingPlugin,
 			AggressiveSplittingPlugin,
 			LimitChunkCountPlugin,
+			MergeDuplicateChunksPlugin,
 			MinChunkSizePlugin,
 			ModuleConcatenationPlugin,
 			RealContentHashPlugin,