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EnsureChunkConditionsPlugin.js
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Thu, Feb 13, 18:53

EnsureChunkConditionsPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { STAGE_BASIC } = require("../OptimizationStages");
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGroup")} ChunkGroup */
/** @typedef {import("../Compiler")} Compiler */
class EnsureChunkConditionsPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
"EnsureChunkConditionsPlugin",
compilation => {
const handler = chunks => {
const chunkGraph = compilation.chunkGraph;
// These sets are hoisted here to save memory
// They are cleared at the end of every loop
/** @type {Set<Chunk>} */
const sourceChunks = new Set();
/** @type {Set<ChunkGroup>} */
const chunkGroups = new Set();
for (const module of compilation.modules) {
for (const chunk of chunkGraph.getModuleChunksIterable(module)) {
if (!module.chunkCondition(chunk, compilation)) {
sourceChunks.add(chunk);
for (const group of chunk.groupsIterable) {
chunkGroups.add(group);
}
}
}
if (sourceChunks.size === 0) continue;
/** @type {Set<Chunk>} */
const targetChunks = new Set();
chunkGroupLoop: for (const chunkGroup of chunkGroups) {
// Can module be placed in a chunk of this group?
for (const chunk of chunkGroup.chunks) {
if (module.chunkCondition(chunk, compilation)) {
targetChunks.add(chunk);
continue chunkGroupLoop;
}
}
// We reached the entrypoint: fail
if (chunkGroup.isInitial()) {
throw new Error(
"Cannot fullfil chunk condition of " + module.identifier()
);
}
// Try placing in all parents
for (const group of chunkGroup.parentsIterable) {
chunkGroups.add(group);
}
}
for (const sourceChunk of sourceChunks) {
chunkGraph.disconnectChunkAndModule(sourceChunk, module);
}
for (const targetChunk of targetChunks) {
chunkGraph.connectChunkAndModule(targetChunk, module);
}
sourceChunks.clear();
chunkGroups.clear();
}
};
compilation.hooks.optimizeChunks.tap(
{
name: "EnsureChunkConditionsPlugin",
stage: STAGE_BASIC
},
handler
);
}
);
}
}
module.exports = EnsureChunkConditionsPlugin;

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