настройка webpack

node_modules/webpack/lib/optimize/AggressiveMergingPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+class AggressiveMergingPlugin {
+	constructor(options) {
+		if (
+			(options !== undefined && typeof options !== "object") ||
+			Array.isArray(options)
+		) {
+			throw new Error(
+				"Argument should be an options object. To use defaults, pass in nothing.\nFor more info on options, see https://webpack.js.org/plugins/"
+			);
+		}
+		this.options = options || {};
+	}
+
+	apply(compiler) {
+		const options = this.options;
+		const minSizeReduce = options.minSizeReduce || 1.5;
+
+		compiler.hooks.thisCompilation.tap(
+			"AggressiveMergingPlugin",
+			compilation => {
+				compilation.hooks.optimizeChunksAdvanced.tap(
+					"AggressiveMergingPlugin",
+					chunks => {
+						let combinations = [];
+						chunks.forEach((a, idx) => {
+							if (a.canBeInitial()) return;
+							for (let i = 0; i < idx; i++) {
+								const b = chunks[i];
+								if (b.canBeInitial()) continue;
+								combinations.push({
+									a,
+									b,
+									improvement: undefined
+								});
+							}
+						});
+
+						for (const pair of combinations) {
+							const a = pair.b.size({
+								chunkOverhead: 0
+							});
+							const b = pair.a.size({
+								chunkOverhead: 0
+							});
+							const ab = pair.b.integratedSize(pair.a, {
+								chunkOverhead: 0
+							});
+							let newSize;
+							if (ab === false) {
+								pair.improvement = false;
+								return;
+							} else {
+								newSize = ab;
+							}
+
+							pair.improvement = (a + b) / newSize;
+						}
+						combinations = combinations.filter(pair => {
+							return pair.improvement !== false;
+						});
+						combinations.sort((a, b) => {
+							return b.improvement - a.improvement;
+						});
+
+						const pair = combinations[0];
+
+						if (!pair) return;
+						if (pair.improvement < minSizeReduce) return;
+
+						if (pair.b.integrate(pair.a, "aggressive-merge")) {
+							chunks.splice(chunks.indexOf(pair.a), 1);
+							return true;
+						}
+					}
+				);
+			}
+		);
+	}
+}
+
+module.exports = AggressiveMergingPlugin;