MinChunkSizePlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const validateOptions = require("schema-utils");
const schema = require("../../schemas/plugins/optimize/MinChunkSizePlugin.json");
/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
class MinChunkSizePlugin {
/**
* @param {MinChunkSizePluginOptions} options options object
*/
constructor(options) {
validateOptions(schema, options, "Min Chunk Size Plugin");
this.options = options;
}
apply(compiler) {
const options = this.options;
const minChunkSize = options.minChunkSize;
compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
compilation.hooks.optimizeChunksAdvanced.tap(
"MinChunkSizePlugin",
chunks => {
const equalOptions = {
chunkOverhead: 1,
entryChunkMultiplicator: 1
};
const sortedSizeFilteredExtendedPairCombinations = chunks
.reduce((combinations, a, idx) => {
// create combination pairs
for (let i = 0; i < idx; i++) {
const b = chunks[i];
combinations.push([b, a]);
}
return combinations;
}, [])
.filter(pair => {
// check if one of the chunks sizes is smaller than the minChunkSize
const p0SmallerThanMinChunkSize =
pair[0].size(equalOptions) < minChunkSize;
const p1SmallerThanMinChunkSize =
pair[1].size(equalOptions) < minChunkSize;
return p0SmallerThanMinChunkSize || p1SmallerThanMinChunkSize;
})
.map(pair => {
// extend combination pairs with size and integrated size
const a = pair[0].size(options);
const b = pair[1].size(options);
const ab = pair[0].integratedSize(pair[1], options);
return [a + b - ab, ab, pair[0], pair[1]];
})
.filter(pair => {
// filter pairs that do not have an integratedSize
// meaning they can NOT be integrated!
return pair[1] !== false;
})
.sort((a, b) => {
// sadly javascript does an inplace 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];
pair[2].integrate(pair[3], "min-size");
chunks.splice(chunks.indexOf(pair[3]), 1);
return true;
}
);
});
}
}
module.exports = MinChunkSizePlugin;