mirror of https://github.com/webpack/webpack.git
86 lines
2.5 KiB
JavaScript
86 lines
2.5 KiB
JavaScript
/*
|
|
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/LimitChunkCountPlugin.json");
|
|
const { STAGE_ADVANCED } = require("../OptimizationStages");
|
|
|
|
/** @typedef {import("../Chunk")} Chunk */
|
|
/** @typedef {import("../Compiler")} Compiler */
|
|
|
|
class LimitChunkCountPlugin {
|
|
constructor(options) {
|
|
validateOptions(schema, options || {}, "Limit Chunk Count Plugin");
|
|
this.options = options || {};
|
|
}
|
|
|
|
/**
|
|
* @param {Compiler} compiler webpack compiler
|
|
* @returns {void}
|
|
*/
|
|
apply(compiler) {
|
|
const options = this.options;
|
|
compiler.hooks.compilation.tap("LimitChunkCountPlugin", compilation => {
|
|
compilation.hooks.optimizeChunks.tap(
|
|
/** @type {TODO} */ ({
|
|
name: "LimitChunkCountPlugin",
|
|
stage: STAGE_ADVANCED
|
|
}),
|
|
chunks => {
|
|
const chunkGraph = compilation.chunkGraph;
|
|
const maxChunks = options.maxChunks;
|
|
if (!maxChunks) return;
|
|
if (maxChunks < 1) return;
|
|
if (chunks.length <= maxChunks) return;
|
|
|
|
const sortedExtendedPairCombinations = chunks
|
|
.reduce((/** @type {[Chunk, Chunk][]} */ combinations, a, idx) => {
|
|
// create combination pairs
|
|
for (let i = 0; i < idx; i++) {
|
|
const b = chunks[i];
|
|
// filter pairs that can NOT be integrated!
|
|
if (chunkGraph.canChunksBeIntegrated(b, a)) {
|
|
combinations.push([b, a]);
|
|
}
|
|
}
|
|
return combinations;
|
|
}, [])
|
|
.map(pair => {
|
|
// extend combination pairs with size and integrated size
|
|
const a = chunkGraph.getChunkSize(pair[0], options);
|
|
const b = chunkGraph.getChunkSize(pair[1], options);
|
|
const ab = chunkGraph.getIntegratedChunksSize(
|
|
pair[0],
|
|
pair[1],
|
|
options
|
|
);
|
|
/** @type {[number, number, Chunk, Chunk, number, number]} */
|
|
const extendedPair = [a + b - ab, ab, pair[0], pair[1], a, b];
|
|
return extendedPair;
|
|
})
|
|
.sort((a, b) => {
|
|
// sadly javascript does an inplace sort here
|
|
// sort them by size
|
|
const diff = b[0] - a[0];
|
|
if (diff !== 0) return diff;
|
|
return a[1] - b[1];
|
|
});
|
|
|
|
const pair = sortedExtendedPairCombinations[0];
|
|
|
|
if (pair) {
|
|
chunkGraph.integrateChunks(pair[2], pair[3]);
|
|
chunks.splice(chunks.indexOf(pair[3]), 1);
|
|
return true;
|
|
}
|
|
}
|
|
);
|
|
});
|
|
}
|
|
}
|
|
module.exports = LimitChunkCountPlugin;
|