/*
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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 { STAGE_ADVANCED } = require("../OptimizationStages");
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const createSchemaValidation = require("../util/create-schema-validation");
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/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compiler")} Compiler */
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const validate = createSchemaValidation(
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require("../../schemas/plugins/optimize/MinChunkSizePlugin.check.js"),
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() => require("../../schemas/plugins/optimize/MinChunkSizePlugin.json"),
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{
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name: "Min Chunk Size Plugin",
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baseDataPath: "options"
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}
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);
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class MinChunkSizePlugin {
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/**
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* @param {MinChunkSizePluginOptions} options options object
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*/
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constructor(options) {
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validate(options);
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this.options = options;
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}
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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const options = this.options;
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const minChunkSize = options.minChunkSize;
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compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
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compilation.hooks.optimizeChunks.tap(
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{
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name: "MinChunkSizePlugin",
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stage: STAGE_ADVANCED
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},
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chunks => {
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const chunkGraph = compilation.chunkGraph;
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const equalOptions = {
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chunkOverhead: 1,
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entryChunkMultiplicator: 1
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};
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const chunkSizesMap = new Map();
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/** @type {[Chunk, Chunk][]} */
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const combinations = [];
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/** @type {Chunk[]} */
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const smallChunks = [];
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const visitedChunks = [];
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for (const a of chunks) {
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// check if one of the chunks sizes is smaller than the minChunkSize
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// and filter pairs that can NOT be integrated!
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if (chunkGraph.getChunkSize(a, equalOptions) < minChunkSize) {
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smallChunks.push(a);
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for (const b of visitedChunks) {
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if (chunkGraph.canChunksBeIntegrated(b, a))
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combinations.push([b, a]);
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}
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} else {
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for (const b of smallChunks) {
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if (chunkGraph.canChunksBeIntegrated(b, a))
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combinations.push([b, a]);
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}
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}
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chunkSizesMap.set(a, chunkGraph.getChunkSize(a, options));
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visitedChunks.push(a);
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}
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const sortedSizeFilteredExtendedPairCombinations = combinations
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.map(pair => {
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// extend combination pairs with size and integrated size
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const a = chunkSizesMap.get(pair[0]);
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const b = chunkSizesMap.get(pair[1]);
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const ab = chunkGraph.getIntegratedChunksSize(
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pair[0],
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pair[1],
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options
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);
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/** @type {[number, number, Chunk, Chunk]} */
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const extendedPair = [a + b - ab, ab, pair[0], pair[1]];
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return extendedPair;
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})
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.sort((a, b) => {
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// sadly javascript does an in place sort here
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// sort by size
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const diff = b[0] - a[0];
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if (diff !== 0) return diff;
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return a[1] - b[1];
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});
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if (sortedSizeFilteredExtendedPairCombinations.length === 0) return;
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const pair = sortedSizeFilteredExtendedPairCombinations[0];
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chunkGraph.integrateChunks(pair[2], pair[3]);
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compilation.chunks.delete(pair[3]);
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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 = MinChunkSizePlugin;
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