source: trip-planner-front/node_modules/enhanced-resolve/lib/AliasFieldPlugin.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.5 KB
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1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3 Author Tobias Koppers @sokra
4*/
5
6"use strict";
7
8const DescriptionFileUtils = require("./DescriptionFileUtils");
9const getInnerRequest = require("./getInnerRequest");
10
11/** @typedef {import("./Resolver")} Resolver */
12/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
13/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
14
15module.exports = class AliasFieldPlugin {
16 /**
17 * @param {string | ResolveStepHook} source source
18 * @param {string | Array<string>} field field
19 * @param {string | ResolveStepHook} target target
20 */
21 constructor(source, field, target) {
22 this.source = source;
23 this.field = field;
24 this.target = target;
25 }
26
27 /**
28 * @param {Resolver} resolver the resolver
29 * @returns {void}
30 */
31 apply(resolver) {
32 const target = resolver.ensureHook(this.target);
33 resolver
34 .getHook(this.source)
35 .tapAsync("AliasFieldPlugin", (request, resolveContext, callback) => {
36 if (!request.descriptionFileData) return callback();
37 const innerRequest = getInnerRequest(resolver, request);
38 if (!innerRequest) return callback();
39 const fieldData = DescriptionFileUtils.getField(
40 request.descriptionFileData,
41 this.field
42 );
43 if (fieldData === null || typeof fieldData !== "object") {
44 if (resolveContext.log)
45 resolveContext.log(
46 "Field '" +
47 this.field +
48 "' doesn't contain a valid alias configuration"
49 );
50 return callback();
51 }
52 const data1 = fieldData[innerRequest];
53 const data2 = fieldData[innerRequest.replace(/^\.\//, "")];
54 const data = typeof data1 !== "undefined" ? data1 : data2;
55 if (data === innerRequest) return callback();
56 if (data === undefined) return callback();
57 if (data === false) {
58 /** @type {ResolveRequest} */
59 const ignoreObj = {
60 ...request,
61 path: false
62 };
63 return callback(null, ignoreObj);
64 }
65 const obj = {
66 ...request,
67 path: request.descriptionFileRoot,
68 request: data,
69 fullySpecified: false
70 };
71 resolver.doResolve(
72 target,
73 obj,
74 "aliased from description file " +
75 request.descriptionFilePath +
76 " with mapping '" +
77 innerRequest +
78 "' to '" +
79 data +
80 "'",
81 resolveContext,
82 (err, result) => {
83 if (err) return callback(err);
84
85 // Don't allow other aliasing or raw request
86 if (result === undefined) return callback(null, null);
87 callback(null, result);
88 }
89 );
90 });
91 }
92};
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