1 files changed, 113 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/optimize/MinChunkSizePlugin.js b/node_modules/webpack/lib/optimize/MinChunkSizePlugin.js
new file mode 100644
index 00000000..b51164c2
--- /dev/null
+++ b/node_modules/webpack/lib/optimize/MinChunkSizePlugin.js
@@ -0,0 +1,113 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_ADVANCED } = require("../OptimizationStages");
+const createSchemaValidation = require("../util/create-schema-validation");
+
+/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Compiler")} Compiler */
+
+const validate = createSchemaValidation(
+	require("../../schemas/plugins/optimize/MinChunkSizePlugin.check.js"),
+	() => require("../../schemas/plugins/optimize/MinChunkSizePlugin.json"),
+	{
+		name: "Min Chunk Size Plugin",
+		baseDataPath: "options"
+	}
+);
+
+class MinChunkSizePlugin {
+	/**
+	 * @param {MinChunkSizePluginOptions} options options object
+	 */
+	constructor(options) {
+		validate(options);
+		this.options = options;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const options = this.options;
+		const minChunkSize = options.minChunkSize;
+		compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: "MinChunkSizePlugin",
+					stage: STAGE_ADVANCED
+				},
+				chunks => {
+					const chunkGraph = compilation.chunkGraph;
+					const equalOptions = {
+						chunkOverhead: 1,
+						entryChunkMultiplicator: 1
+					};
+
+					const chunkSizesMap = new Map();
+					/** @type {[Chunk, Chunk][]} */
+					const combinations = [];
+					/** @type {Chunk[]} */
+					const smallChunks = [];
+					const visitedChunks = [];
+					for (const a of chunks) {
+						// check if one of the chunks sizes is smaller than the minChunkSize
+						// and filter pairs that can NOT be integrated!
+						if (chunkGraph.getChunkSize(a, equalOptions) < minChunkSize) {
+							smallChunks.push(a);
+							for (const b of visitedChunks) {
+								if (chunkGraph.canChunksBeIntegrated(b, a))
+									combinations.push([b, a]);
+							}
+						} else {
+							for (const b of smallChunks) {
+								if (chunkGraph.canChunksBeIntegrated(b, a))
+									combinations.push([b, a]);
+							}
+						}
+						chunkSizesMap.set(a, chunkGraph.getChunkSize(a, options));
+						visitedChunks.push(a);
+					}
+
+					const sortedSizeFilteredExtendedPairCombinations = combinations
+						.map(pair => {
+							// extend combination pairs with size and integrated size
+							const a = chunkSizesMap.get(pair[0]);
+							const b = chunkSizesMap.get(pair[1]);
+							const ab = chunkGraph.getIntegratedChunksSize(
+								pair[0],
+								pair[1],
+								options
+							);
+							/** @type {[number, number, Chunk, Chunk]} */
+							const extendedPair = [a + b - ab, ab, pair[0], pair[1]];
+							return extendedPair;
+						})
+						.sort((a, b) => {
+							// sadly javascript does an in place sort here
+							// sort by size
+							const diff = b[0] - a[0];
+							if (diff !== 0) return diff;
+							return a[1] - b[1];
+						});
+
+					if (sortedSizeFilteredExtendedPairCombinations.length === 0) return;
+
+					const pair = sortedSizeFilteredExtendedPairCombinations[0];
+
+					chunkGraph.integrateChunks(pair[2], pair[3]);
+					compilation.chunks.delete(pair[3]);
+					return true;
+				}
+			);
+		});
+	}
+}
+module.exports = MinChunkSizePlugin;