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

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Maël Nison @arcanis
*/

"use strict";

/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/**
 * @typedef {Object} PnpApiImpl
 * @property {function(string, string, object): string | null} resolveToUnqualified
 */

module.exports = class PnpPlugin {
        /**
         * @param {string | ResolveStepHook} source source
         * @param {PnpApiImpl} pnpApi pnpApi
         * @param {string | ResolveStepHook} target target
         * @param {string | ResolveStepHook} alternateTarget alternateTarget
         */
        constructor(source, pnpApi, target, alternateTarget) {
                this.source = source;
                this.pnpApi = pnpApi;
                this.target = target;
                this.alternateTarget = alternateTarget;
        }

        /**
         * @param {Resolver} resolver the resolver
         * @returns {void}
         */
        apply(resolver) {
                /** @type {ResolveStepHook} */
                const target = resolver.ensureHook(this.target);
                const alternateTarget = resolver.ensureHook(this.alternateTarget);
                resolver
                        .getHook(this.source)
                        .tapAsync("PnpPlugin", (request, resolveContext, callback) => {
                                const req = request.request;
                                if (!req) return callback();

                                // The trailing slash indicates to PnP that this value is a folder rather than a file
                                const issuer = `${request.path}/`;

                                const packageMatch = /^(@[^/]+\/)?[^/]+/.exec(req);
                                if (!packageMatch) return callback();

                                const packageName = packageMatch[0];
                                const innerRequest = `.${req.slice(packageName.length)}`;

                                /** @type {string|undefined|null} */
                                let resolution;
                                /** @type {string|undefined|null} */
                                let apiResolution;
                                try {
                                        resolution = this.pnpApi.resolveToUnqualified(packageName, issuer, {
                                                considerBuiltins: false
                                        });

                                        if (resolution === null) {
                                                // This is either not a PnP managed issuer or it's a Node builtin
                                                // Try to continue resolving with our alternatives
                                                resolver.doResolve(
                                                        alternateTarget,
                                                        request,
                                                        "issuer is not managed by a pnpapi",
                                                        resolveContext,
                                                        (err, result) => {
                                                                if (err) return callback(err);
                                                                if (result) return callback(null, result);
                                                                // Skip alternatives
                                                                return callback(null, null);
                                                        }
                                                );
                                                return;
                                        }

                                        if (resolveContext.fileDependencies) {
                                                apiResolution = this.pnpApi.resolveToUnqualified("pnpapi", issuer, {
                                                        considerBuiltins: false
                                                });
                                        }
                                } catch (/** @type {unknown} */ error) {
                                        if (
                                                /** @type {Error & { code: string }} */
                                                (error).code === "MODULE_NOT_FOUND" &&
                                                /** @type {Error & { pnpCode: string }} */
                                                (error).pnpCode === "UNDECLARED_DEPENDENCY"
                                        ) {
                                                // This is not a PnP managed dependency.
                                                // Try to continue resolving with our alternatives
                                                if (resolveContext.log) {
                                                        resolveContext.log(`request is not managed by the pnpapi`);
                                                        for (const line of /** @type {Error} */ (error).message
                                                                .split("\n")
                                                                .filter(Boolean))
                                                                resolveContext.log(`  ${line}`);
                                                }
                                                return callback();
                                        }
                                        return callback(/** @type {Error} */ (error));
                                }

                                if (resolution === packageName) return callback();

                                if (apiResolution && resolveContext.fileDependencies) {
                                        resolveContext.fileDependencies.add(apiResolution);
                                }
                                /** @type {ResolveRequest} */
                                const obj = {
                                        ...request,
                                        path: resolution,
                                        request: innerRequest,
                                        ignoreSymlinks: true,
                                        fullySpecified: request.fullySpecified && innerRequest !== "."
                                };
                                resolver.doResolve(
                                        target,
                                        obj,
                                        `resolved by pnp to ${resolution}`,
                                        resolveContext,
                                        (err, result) => {
                                                if (err) return callback(err);
                                                if (result) return callback(null, result);
                                                // Skip alternatives
                                                return callback(null, null);
                                        }
                                );
                        });
        }
};