name : ConditionalPlugin.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 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 = /** @type {(keyof ResolveRequest)[]} */ (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); } ); }); } };