ConditionalPlugin.js
583449d99081issn4frontend

ConditionalPlugin.js
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			/*
			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 ConditionalPlugin {
			/**
			* @param {string \| ResolveStepHook} source source
			* @param {Partial<ResolveRequest>} test compare object
			* @param {string \| null} message log message
			* @param {boolean} allowAlternatives when false, do not continue with the current step when "test" matches
			* @param {string \| ResolveStepHook} target target
			*/
			constructor(source, test, message, allowAlternatives, target) {
			this.source = source;
			this.test = test;
			this.message = message;
			this.allowAlternatives = allowAlternatives;
			this.target = target;
			}

			/**
			* @param {Resolver} resolver the resolver
			* @returns {void}
			*/
			apply(resolver) {
			const target = resolver.ensureHook(this.target);
			const { test, message, allowAlternatives } = this;
			const keys = Object.keys(test);
			resolver
			.getHook(this.source)
			.tapAsync("ConditionalPlugin", (request, resolveContext, callback) => {
			for (const prop of keys) {
			if (request[prop] !== test[prop]) return callback();
			}
			resolver.doResolve(
			target,
			request,
			message,
			resolveContext,
			allowAlternatives
			? callback
			: (err, result) => {
			if (err) return callback(err);

			// Don't allow other alternatives
			if (result === undefined) return callback(null, null);
			callback(null, result);
			}
			);
			});
			}
			};