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node_modules/enhanced-resolve/lib/ExtensionAliasPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const forEachBail = require("./forEachBail");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+/** @typedef {{ alias: string|string[], extension: string }} ExtensionAliasOption */
+
+module.exports = class ExtensionAliasPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {ExtensionAliasOption} options options
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, options, target) {
+		this.source = source;
+		this.options = options;
+		this.target = target;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		const { extension, alias } = this.options;
+		resolver
+			.getHook(this.source)
+			.tapAsync("ExtensionAliasPlugin", (request, resolveContext, callback) => {
+				const requestPath = request.request;
+				if (!requestPath || !requestPath.endsWith(extension)) return callback();
+				const resolve = (alias, callback) => {
+					resolver.doResolve(
+						target,
+						{
+							...request,
+							request: `${requestPath.slice(0, -extension.length)}${alias}`,
+							fullySpecified: true
+						},
+						`aliased from extension alias with mapping '${extension}' to '${alias}'`,
+						resolveContext,
+						callback
+					);
+				};
+
+				const stoppingCallback = (err, result) => {
+					if (err) return callback(err);
+					if (result) return callback(null, result);
+					// Don't allow other aliasing or raw request
+					return callback(null, null);
+				};
+				if (typeof alias === "string") {
+					resolve(alias, stoppingCallback);
+				} else if (alias.length > 1) {
+					forEachBail(alias, resolve, stoppingCallback);
+				} else {
+					resolve(alias[0], stoppingCallback);
+				}
+			});
+	}
+};