webpack/lib/ids/ChunkModuleIdRangePlugin.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 Tobias Koppers @sokra
*/

"use strict";

const { find } = require("../util/SetHelpers");
const {
	compareModulesByPreOrderIndexOrIdentifier,
	compareModulesByPostOrderIndexOrIdentifier
} = require("../util/comparators");

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

/**
 * @typedef {object} ChunkModuleIdRangePluginOptions
 * @property {string} name the chunk name
 * @property {("index" | "index2" | "preOrderIndex" | "postOrderIndex")=} order order
 * @property {number=} start start id
 * @property {number=} end end id
 */

const PLUGIN_NAME = "ChunkModuleIdRangePlugin";

class ChunkModuleIdRangePlugin {
	/**
	 * @param {ChunkModuleIdRangePluginOptions} options options object
	 */
	constructor(options) {
		this.options = options;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		const options = this.options;
		compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
			const moduleGraph = compilation.moduleGraph;
			compilation.hooks.moduleIds.tap(PLUGIN_NAME, modules => {
				const chunkGraph = compilation.chunkGraph;
				const chunk = find(
					compilation.chunks,
					chunk => chunk.name === options.name
				);
				if (!chunk) {
					throw new Error(
						`${PLUGIN_NAME}: Chunk with name '${options.name}"' was not found`
					);
				}

				let chunkModules;
				if (options.order) {
					let cmpFn;
					switch (options.order) {
						case "index":
						case "preOrderIndex":
							cmpFn = compareModulesByPreOrderIndexOrIdentifier(moduleGraph);
							break;
						case "index2":
						case "postOrderIndex":
							cmpFn = compareModulesByPostOrderIndexOrIdentifier(moduleGraph);
							break;
						default:
							throw new Error(`${PLUGIN_NAME}: unexpected value of order`);
					}
					chunkModules = chunkGraph.getOrderedChunkModules(chunk, cmpFn);
				} else {
					chunkModules = Array.from(modules)
						.filter(m => chunkGraph.isModuleInChunk(m, chunk))
						.sort(compareModulesByPreOrderIndexOrIdentifier(moduleGraph));
				}

				let currentId = options.start || 0;
				for (let i = 0; i < chunkModules.length; i++) {
					const m = chunkModules[i];
					if (m.needId && chunkGraph.getModuleId(m) === null) {
						chunkGraph.setModuleId(m, currentId++);
					}
					if (options.end && currentId > options.end) break;
				}
			});
		});
	}
}
module.exports = ChunkModuleIdRangePlugin;