node_modules/enhanced-resolve/lib/ConditionalPlugin.js

   1 /*
   2         MIT License http://www.opensource.org/licenses/mit-license.php
   3         Author Tobias Koppers @sokra
   4 */
   5
   6 "use strict";
   7
   8 /** @typedef {import("./Resolver")} Resolver */
   9 /** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
  10 /** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
  11
  12 module.exports = class ConditionalPlugin {
  13         /**
  14          * @param {string | ResolveStepHook} source source
  15          * @param {Partial<ResolveRequest>} test compare object
  16          * @param {string | null} message log message
  17          * @param {boolean} allowAlternatives when false, do not continue with the current step when "test" matches
  18          * @param {string | ResolveStepHook} target target
  19          */
  20         constructor(source, test, message, allowAlternatives, target) {
  21                 this.source = source;
  22                 this.test = test;
  23                 this.message = message;
  24                 this.allowAlternatives = allowAlternatives;
  25                 this.target = target;
  26         }
  27
  28         /**
  29          * @param {Resolver} resolver the resolver
  30          * @returns {void}
  31          */
  32         apply(resolver) {
  33                 const target = resolver.ensureHook(this.target);
  34                 const { test, message, allowAlternatives } = this;
  35                 const keys = Object.keys(test);
  36                 resolver
  37                         .getHook(this.source)
  38                         .tapAsync("ConditionalPlugin", (request, resolveContext, callback) => {
  39                                 for (const prop of keys) {
  40                                         if (request[prop] !== test[prop]) return callback();
  41                                 }
  42                                 resolver.doResolve(
  43                                         target,
  44                                         request,
  45                                         message,
  46                                         resolveContext,
  47                                         allowAlternatives
  48                                                 ? callback
  49                                                 : (err, result) => {
  50                                                                 if (err) return callback(err);
  51
  52                                                                 // Don't allow other alternatives
  53                                                                 if (result === undefined) return callback(null, null);
  54                                                                 callback(null, result);
  55                                                   }
  56                                 );
  57                         });
  58         }
  59 };