package.lib.optimize.EnsureChunkConditionsPlugin.js Maven / Gradle / Ivy

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Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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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 => {
				/**
				 * @param {Iterable} chunks the chunks
				 */
				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} */
					const sourceChunks = new Set();
					/** @type {Set} */
					const chunkGroups = new Set();
					for (const module of compilation.modules) {
						if (!module.hasChunkCondition()) continue;
						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} */
						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 fulfil 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;