webpack/lib/ids/ChunkModuleIdRangePlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 */

class ChunkModuleIdRangePlugin {
	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("ChunkModuleIdRangePlugin", compilation => {
			const moduleGraph = compilation.moduleGraph;
			compilation.hooks.moduleIds.tap("ChunkModuleIdRangePlugin", modules => {
				const chunkGraph = compilation.chunkGraph;
				const chunk = find(
					compilation.chunks,
					chunk => chunk.name === options.name
				);
				if (!chunk) {
					throw new Error(
						`ChunkModuleIdRangePlugin: 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(
								"ChunkModuleIdRangePlugin: unexpected value of order"
							);
					}
					chunkModules = chunkGraph.getOrderedChunkModules(chunk, cmpFn);
				} else {
					chunkModules = Array.from(modules)
						.filter(m => {
							return 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;