1 files changed, 101 insertions, 0 deletions
diff --git a/node_modules/enhanced-resolve/lib/ExtensionAliasPlugin.js b/node_modules/enhanced-resolve/lib/ExtensionAliasPlugin.js
new file mode 100644
index 00000000..a9479906
--- /dev/null
+++ b/node_modules/enhanced-resolve/lib/ExtensionAliasPlugin.js
@@ -0,0 +1,101 @@
+/*
+	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 isAliasString = typeof alias === "string";
+				/**
+				 * @param {string} alias extension alias
+				 * @param {(err?: null|Error, result?: null|ResolveRequest) => void} callback callback
+				 * @param {number} [index] index
+				 * @returns {void}
+				 */
+				const resolve = (alias, callback, index) => {
+					const newRequest = `${requestPath.slice(
+						0,
+						-extension.length
+					)}${alias}`;
+
+					return resolver.doResolve(
+						target,
+						{
+							...request,
+							request: newRequest,
+							fullySpecified: true
+						},
+						`aliased from extension alias with mapping '${extension}' to '${alias}'`,
+						resolveContext,
+						(err, result) => {
+							// Throw error if we are on the last alias (for multiple aliases) and it failed, always throw if we are not an array or we have only one alias
+							if (!isAliasString && index) {
+								if (index !== this.options.alias.length) {
+									if (resolveContext.log) {
+										resolveContext.log(
+											`Failed to alias from extension alias with mapping '${extension}' to '${alias}' for '${newRequest}': ${err}`
+										);
+									}
+
+									return callback(null, result);
+								}
+
+								return callback(err, result);
+							} else {
+								callback(err, result);
+							}
+						}
+					);
+				};
+				/**
+				 * @param {null|Error} [err] error
+				 * @param {null|ResolveRequest} [result] result
+				 * @returns {void}
+				 */
+				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 (isAliasString) {
+					resolve(alias, stoppingCallback);
+				} else if (alias.length > 1) {
+					forEachBail(alias, resolve, stoppingCallback);
+				} else {
+					resolve(alias[0], stoppingCallback);
+				}
+			});
+	}
+};