source: imaps-frontend/node_modules/enhanced-resolve/lib/JoinRequestPlugin.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */

module.exports = class JoinRequestPlugin {
        /**
         * @param {string | ResolveStepHook} source source
         * @param {string | ResolveStepHook} target target
         */
        constructor(source, target) {
                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("JoinRequestPlugin", (request, resolveContext, callback) => {
                                const requestPath = /** @type {string} */ (request.path);
                                const requestRequest = /** @type {string} */ (request.request);
                                /** @type {ResolveRequest} */
                                const obj = {
                                        ...request,
                                        path: resolver.join(requestPath, requestRequest),
                                        relativePath:
                                                request.relativePath &&
                                                resolver.join(request.relativePath, requestRequest),
                                        request: undefined
                                };
                                resolver.doResolve(target, obj, null, resolveContext, callback);
                        });
        }
};