webpack/lib/NormalModuleReplacementPlugin.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 { join, dirname } = require("./util/fs");

/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./NormalModuleFactory").ResolveData} ResolveData */
/** @typedef {import("./util/fs").InputFileSystem} InputFileSystem */

/** @typedef {(resolveData: ResolveData) => void} ModuleReplacer */

const PLUGIN_NAME = "NormalModuleReplacementPlugin";

class NormalModuleReplacementPlugin {
	/**
	 * Create an instance of the plugin
	 * @param {RegExp} resourceRegExp the resource matcher
	 * @param {string | ModuleReplacer} newResource the resource replacement
	 */
	constructor(resourceRegExp, newResource) {
		this.resourceRegExp = resourceRegExp;
		this.newResource = newResource;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		const resourceRegExp = this.resourceRegExp;
		const newResource = this.newResource;
		compiler.hooks.normalModuleFactory.tap(PLUGIN_NAME, nmf => {
			nmf.hooks.beforeResolve.tap(PLUGIN_NAME, result => {
				if (resourceRegExp.test(result.request)) {
					if (typeof newResource === "function") {
						newResource(result);
					} else {
						result.request = newResource;
					}
				}
			});
			nmf.hooks.afterResolve.tap(PLUGIN_NAME, result => {
				const createData = result.createData;
				if (resourceRegExp.test(/** @type {string} */ (createData.resource))) {
					if (typeof newResource === "function") {
						newResource(result);
					} else {
						const fs =
							/** @type {InputFileSystem} */
							(compiler.inputFileSystem);
						if (
							newResource.startsWith("/") ||
							(newResource.length > 1 && newResource[1] === ":")
						) {
							createData.resource = newResource;
						} else {
							createData.resource = join(
								fs,
								dirname(fs, /** @type {string} */ (createData.resource)),
								newResource
							);
						}
					}
				}
			});
		});
	}
}

module.exports = NormalModuleReplacementPlugin;