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/* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ "use strict"; const { STAGE_ADVANCED } = require("../OptimizationStages"); /** @typedef {import("../Chunk")} Chunk */ /** @typedef {import("../Compiler")} Compiler */ class AggressiveMergingPlugin { constructor(options) { if ( (options !== undefined && typeof options !== "object") || Array.isArray(options) ) { throw new Error( "Argument should be an options object. To use defaults, pass in nothing.\nFor more info on options, see https://webpack.js.org/plugins/" ); } this.options = options || {}; } /** * Apply the plugin * @param {Compiler} compiler the compiler instance * @returns {void} */ apply(compiler) { const options = this.options; const minSizeReduce = options.minSizeReduce || 1.5; compiler.hooks.thisCompilation.tap( "AggressiveMergingPlugin", compilation => { compilation.hooks.optimizeChunks.tap( { name: "AggressiveMergingPlugin", stage: STAGE_ADVANCED }, chunks => { const chunkGraph = compilation.chunkGraph; /** @type {{a: Chunk, b: Chunk, improvement: number}[]} */ let combinations = []; for (const a of chunks) { if (a.canBeInitial()) continue; for (const b of chunks) { if (b.canBeInitial()) continue; if (b === a) break; if (!chunkGraph.canChunksBeIntegrated(a, b)) { continue; } const aSize = chunkGraph.getChunkSize(b, { chunkOverhead: 0 }); const bSize = chunkGraph.getChunkSize(a, { chunkOverhead: 0 }); const abSize = chunkGraph.getIntegratedChunksSize(b, a, { chunkOverhead: 0 }); const improvement = (aSize + bSize) / abSize; combinations.push({ a, b, improvement }); } } combinations.sort((a, b) => { return b.improvement - a.improvement; }); const pair = combinations[0]; if (!pair) return; if (pair.improvement < minSizeReduce) return; chunkGraph.integrateChunks(pair.b, pair.a); compilation.chunks.delete(pair.a); return true; } ); } ); } } module.exports = AggressiveMergingPlugin;