webpack/lib/ids/DeterministicModuleIdsPlugin.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 Florent Cailhol @ooflorent
*/

"use strict";

const {
	compareModulesByPreOrderIndexOrIdentifier
} = require("../util/comparators");
const {
	getUsedModuleIds,
	getFullModuleName,
	assignDeterministicIds
} = require("./IdHelpers");

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

class DeterministicModuleIdsPlugin {
	constructor(options) {
		this.options = options || {};
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"DeterministicModuleIdsPlugin",
			compilation => {
				compilation.hooks.moduleIds.tap(
					"DeterministicModuleIdsPlugin",
					modules => {
						const chunkGraph = compilation.chunkGraph;
						const context = this.options.context
							? this.options.context
							: compiler.context;
						const maxLength = this.options.maxLength || 3;

						const usedIds = getUsedModuleIds(compilation);
						assignDeterministicIds(
							Array.from(modules).filter(module => {
								if (!module.needId) return false;
								if (chunkGraph.getNumberOfModuleChunks(module) === 0)
									return false;
								return chunkGraph.getModuleId(module) === null;
							}),
							module => getFullModuleName(module, context, compiler.root),
							compareModulesByPreOrderIndexOrIdentifier(
								compilation.moduleGraph
							),
							(module, id) => {
								const size = usedIds.size;
								usedIds.add(`${id}`);
								if (size === usedIds.size) return false;
								chunkGraph.setModuleId(module, id);
								return true;
							},
							[Math.pow(10, maxLength)],
							10,
							usedIds.size
						);
					}
				);
			}
		);
	}
}

module.exports = DeterministicModuleIdsPlugin;