webpack/lib/ids/DeterministicChunkIdsPlugin.js

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.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Florent Cailhol @ooflorent
*/

"use strict";

const { compareChunksNatural } = require("../util/comparators");
const {
	assignDeterministicIds,
	getFullChunkName,
	getUsedChunkIds
} = require("./IdHelpers");

/** @typedef {import("../Compiler")} Compiler */

/**
 * Defines the deterministic chunk ids plugin options type used by this module.
 * @typedef {object} DeterministicChunkIdsPluginOptions
 * @property {string=} context context for ids
 * @property {number=} maxLength maximum length of ids
 */

const PLUGIN_NAME = "DeterministicChunkIdsPlugin";

class DeterministicChunkIdsPlugin {
	/**
	 * Creates an instance of DeterministicChunkIdsPlugin.
	 * @param {DeterministicChunkIdsPluginOptions=} options options
	 */
	constructor(options = {}) {
		/** @type {DeterministicChunkIdsPluginOptions} */
		this.options = options;
	}

	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
			compilation.hooks.chunkIds.tap(PLUGIN_NAME, (chunks) => {
				const chunkGraph = compilation.chunkGraph;
				const context = this.options.context
					? this.options.context
					: compiler.context;
				const maxLength = this.options.maxLength || 3;

				const compareNatural = compareChunksNatural(chunkGraph);

				const usedIds = getUsedChunkIds(compilation);
				assignDeterministicIds(
					[...chunks].filter((chunk) => chunk.id === null),
					(chunk) =>
						getFullChunkName(chunk, chunkGraph, context, compiler.root),
					compareNatural,
					(chunk, id) => {
						const size = usedIds.size;
						usedIds.add(`${id}`);
						if (size === usedIds.size) return false;
						chunk.id = id;
						chunk.ids = [id];
						return true;
					},
					[10 ** maxLength],
					10,
					usedIds.size
				);
			});
		});
	}
}

module.exports = DeterministicChunkIdsPlugin;