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MinChunkSizePlugin.js
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Mon, Feb 10, 23:58

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

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