/*
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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/MinChunkSizePlugin.json");
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/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
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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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validateOptions(schema, options, "Min Chunk Size Plugin");
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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 minChunkSize = options.minChunkSize;
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compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
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compilation.hooks.optimizeChunksAdvanced.tap(
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"MinChunkSizePlugin",
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chunks => {
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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 sortedSizeFilteredExtendedPairCombinations = chunks
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.reduce((combinations, a, idx) => {
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// create combination pairs
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for (let i = 0; i < idx; i++) {
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const b = chunks[i];
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combinations.push([b, a]);
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}
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return combinations;
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}, [])
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.filter(pair => {
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// check if one of the chunks sizes is smaller than the minChunkSize
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const p0SmallerThanMinChunkSize =
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pair[0].size(equalOptions) < minChunkSize;
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const p1SmallerThanMinChunkSize =
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pair[1].size(equalOptions) < minChunkSize;
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return p0SmallerThanMinChunkSize || p1SmallerThanMinChunkSize;
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})
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.map(pair => {
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// extend combination pairs with size and integrated size
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const a = pair[0].size(options);
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const b = pair[1].size(options);
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const ab = pair[0].integratedSize(pair[1], options);
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return [a + b - ab, ab, pair[0], pair[1]];
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})
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.filter(pair => {
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// filter pairs that do not have an integratedSize
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// meaning they can NOT be integrated!
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return pair[1] !== false;
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})
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.sort((a, b) => {
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// sadly javascript does an inplace 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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pair[2].integrate(pair[3], "min-size");
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chunks.splice(chunks.indexOf(pair[3]), 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 = MinChunkSizePlugin;
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