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node_modules/enhanced-resolve/lib/RootsPlugin.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 */
+
+class RootsPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source hook
+	 * @param {Set<string>} roots roots
+	 * @param {string | ResolveStepHook} target target hook
+	 */
+	constructor(source, roots, target) {
+		this.roots = [...roots];
+		this.source = source;
+		this.target = target;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+
+		resolver
+			.getHook(this.source)
+			.tapAsync("RootsPlugin", (request, resolveContext, callback) => {
+				const req = request.request;
+				if (!req) return callback();
+				if (!req.startsWith("/")) return callback();
+
+				forEachBail(
+					this.roots,
+					/**
+					 * @param {string} root root
+					 * @param {(err?: null | Error, result?: null | ResolveRequest) => void} callback callback
+					 * @returns {void}
+					 */
+					(root, callback) => {
+						const path = resolver.join(root, req.slice(1));
+						/** @type {ResolveRequest} */
+						const obj = {
+							...request,
+							path,
+							relativePath: request.relativePath && path,
+						};
+						resolver.doResolve(
+							target,
+							obj,
+							`root path ${root}`,
+							resolveContext,
+							callback,
+						);
+					},
+					callback,
+				);
+			});
+	}
+}
+
+module.exports = RootsPlugin;