mirror of https://github.com/webpack/webpack.git
104 lines
2.9 KiB
JavaScript
104 lines
2.9 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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const validateOptions = require("schema-utils");
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const schema = require("../../schemas/plugins/optimize/OccurrenceOrderModuleIdsPlugin.json");
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class OccurrenceOrderModuleIdsPlugin {
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constructor(options = {}) {
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validateOptions(schema, options, "Occurrence Order Module Ids Plugin");
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this.options = options;
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}
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apply(compiler) {
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const prioritiseInitial = this.options.prioritiseInitial;
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compiler.hooks.compilation.tap(
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"OccurrenceOrderModuleIdsPlugin",
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compilation => {
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compilation.hooks.optimizeModuleOrder.tap(
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"OccurrenceOrderModuleIdsPlugin",
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modules => {
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const occursInInitialChunksMap = new Map();
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const occursInAllChunksMap = new Map();
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const initialChunkChunkMap = new Map();
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const entryCountMap = new Map();
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for (const m of modules) {
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let initial = 0;
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let entry = 0;
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for (const c of m.chunksIterable) {
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if (c.canBeInitial()) initial++;
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if (c.entryModule === m) entry++;
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}
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initialChunkChunkMap.set(m, initial);
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entryCountMap.set(m, entry);
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}
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const countOccursInEntry = (sum, r) => {
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if (!r.module) {
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return sum;
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}
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return sum + initialChunkChunkMap.get(r.module);
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};
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const countOccurs = (sum, r) => {
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if (!r.module) {
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return sum;
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}
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let factor = 1;
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if (typeof r.dependency.getNumberOfIdOccurrences === "function") {
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factor = r.dependency.getNumberOfIdOccurrences();
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}
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if (factor === 0) {
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return sum;
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}
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return sum + factor * r.module.getNumberOfChunks();
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};
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if (prioritiseInitial) {
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for (const m of modules) {
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const result =
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m.reasons.reduce(countOccursInEntry, 0) +
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initialChunkChunkMap.get(m) +
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entryCountMap.get(m);
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occursInInitialChunksMap.set(m, result);
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}
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}
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const originalOrder = new Map();
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let i = 0;
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for (const m of modules) {
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const result =
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m.reasons.reduce(countOccurs, 0) +
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m.getNumberOfChunks() +
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entryCountMap.get(m);
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occursInAllChunksMap.set(m, result);
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originalOrder.set(m, i++);
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}
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modules.sort((a, b) => {
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if (prioritiseInitial) {
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const aEntryOccurs = occursInInitialChunksMap.get(a);
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const bEntryOccurs = occursInInitialChunksMap.get(b);
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if (aEntryOccurs > bEntryOccurs) return -1;
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if (aEntryOccurs < bEntryOccurs) return 1;
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}
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const aOccurs = occursInAllChunksMap.get(a);
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const bOccurs = occursInAllChunksMap.get(b);
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if (aOccurs > bOccurs) return -1;
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if (aOccurs < bOccurs) return 1;
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const orgA = originalOrder.get(a);
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const orgB = originalOrder.get(b);
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return orgA - orgB;
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});
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}
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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 = OccurrenceOrderModuleIdsPlugin;
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