116 lines
3.1 KiB
JavaScript
116 lines
3.1 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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class AggressiveMergingPlugin {
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constructor(options) {
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if(options !== undefined && typeof options !== "object" || Array.isArray(options)) {
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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/");
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}
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this.options = options || {};
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}
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apply(compiler) {
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const options = this.options;
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const minSizeReduce = options.minSizeReduce || 1.5;
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function getParentsWeight(chunk) {
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return chunk.parents.map((p) => {
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return p.isInitial() ? options.entryChunkMultiplicator || 10 : 1;
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}).reduce((a, b) => {
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return a + b;
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}, 0);
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}
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compiler.plugin("this-compilation", (compilation) => {
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compilation.plugin("optimize-chunks-advanced", (chunks) => {
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let combinations = [];
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chunks.forEach((a, idx) => {
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if(a.isInitial()) return;
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for(let i = 0; i < idx; i++) {
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const b = chunks[i];
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if(b.isInitial()) continue;
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combinations.push({
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a,
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b,
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improvement: undefined
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});
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}
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});
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combinations.forEach((pair) => {
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const a = pair.b.size({
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chunkOverhead: 0
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});
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const b = pair.a.size({
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chunkOverhead: 0
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});
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const ab = pair.b.integratedSize(pair.a, {
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chunkOverhead: 0
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});
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let newSize;
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if(ab === false) {
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pair.improvement = false;
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return;
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} else if(options.moveToParents) {
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const aOnly = ab - b;
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const bOnly = ab - a;
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const common = a + b - ab;
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newSize = common + getParentsWeight(pair.b) * aOnly + getParentsWeight(pair.a) * bOnly;
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} else {
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newSize = ab;
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}
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pair.improvement = (a + b) / newSize;
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});
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combinations = combinations.filter((pair) => {
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return pair.improvement !== false;
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});
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combinations.sort((a, b) => {
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return b.improvement - a.improvement;
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});
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const pair = combinations[0];
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if(!pair) return;
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if(pair.improvement < minSizeReduce) return;
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if(options.moveToParents) {
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const commonModules = pair.b.modules.filter((m) => {
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return pair.a.modules.indexOf(m) >= 0;
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});
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const aOnlyModules = pair.b.modules.filter((m) => {
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return commonModules.indexOf(m) < 0;
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});
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const bOnlyModules = pair.a.modules.filter((m) => {
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return commonModules.indexOf(m) < 0;
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});
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aOnlyModules.forEach((m) => {
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pair.b.removeModule(m);
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m.removeChunk(pair.b);
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pair.b.parents.forEach((c) => {
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c.addModule(m);
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m.addChunk(c);
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});
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});
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bOnlyModules.forEach((m) => {
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pair.a.removeModule(m);
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m.removeChunk(pair.a);
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pair.a.parents.forEach((c) => {
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c.addModule(m);
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m.addChunk(c);
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});
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});
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}
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if(pair.b.integrate(pair.a, "aggressive-merge")) {
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chunks.splice(chunks.indexOf(pair.a), 1);
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return true;
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}
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});
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});
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}
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}
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module.exports = AggressiveMergingPlugin;
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