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121 lines
3.3 KiB
121 lines
3.3 KiB
3 years ago
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const forEachBail = require("./forEachBail");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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/** @typedef {{alias: string|Array<string>|false, name: string, onlyModule?: boolean}} AliasOption */
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module.exports = class AliasPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {AliasOption | Array<AliasOption>} options options
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* @param {string | ResolveStepHook} target target
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*/
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constructor(source, options, target) {
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this.source = source;
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this.options = Array.isArray(options) ? options : [options];
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this.target = target;
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}
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/**
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* @param {Resolver} resolver the resolver
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* @returns {void}
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*/
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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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resolver
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.getHook(this.source)
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.tapAsync("AliasPlugin", (request, resolveContext, callback) => {
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const innerRequest = request.request || request.path;
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if (!innerRequest) return callback();
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forEachBail(
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this.options,
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(item, callback) => {
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let shouldStop = false;
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if (
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innerRequest === item.name ||
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(!item.onlyModule &&
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innerRequest.startsWith(
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request.request
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? `${item.name}/`
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: resolver.join(item.name, "_").slice(0, -1)
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))
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) {
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const remainingRequest = innerRequest.substr(item.name.length);
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const resolveWithAlias = (alias, callback) => {
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if (alias === false) {
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/** @type {ResolveRequest} */
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const ignoreObj = {
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...request,
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path: false
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};
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if (typeof resolveContext.yield === "function") {
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resolveContext.yield(ignoreObj);
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return callback(null, null);
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}
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return callback(null, ignoreObj);
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}
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if (
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innerRequest !== alias &&
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!innerRequest.startsWith(alias + "/")
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) {
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shouldStop = true;
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const newRequestStr = alias + remainingRequest;
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const obj = {
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...request,
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request: newRequestStr,
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fullySpecified: false
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};
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return resolver.doResolve(
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target,
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obj,
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"aliased with mapping '" +
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item.name +
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"': '" +
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alias +
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"' to '" +
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newRequestStr +
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"'",
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resolveContext,
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(err, result) => {
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if (err) return callback(err);
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if (result) return callback(null, result);
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return callback();
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}
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);
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}
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return callback();
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};
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const stoppingCallback = (err, result) => {
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if (err) return callback(err);
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if (result) return callback(null, result);
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// Don't allow other aliasing or raw request
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if (shouldStop) return callback(null, null);
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return callback();
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};
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if (Array.isArray(item.alias)) {
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return forEachBail(
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item.alias,
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resolveWithAlias,
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stoppingCallback
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);
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} else {
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return resolveWithAlias(item.alias, stoppingCallback);
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}
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}
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return callback();
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},
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callback
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);
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});
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}
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};
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