source: trip-planner-front/node_modules/enhanced-resolve/lib/MainFieldPlugin.js

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

initial commit

  • Property mode set to 100644
File size: 2.1 KB
Line 
1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3 Author Tobias Koppers @sokra
4*/
5
6"use strict";
7
8const path = require("path");
9const DescriptionFileUtils = require("./DescriptionFileUtils");
10
11/** @typedef {import("./Resolver")} Resolver */
12/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
13/** @typedef {{name: string|Array<string>, forceRelative: boolean}} MainFieldOptions */
14
15const alreadyTriedMainField = Symbol("alreadyTriedMainField");
16
17module.exports = class MainFieldPlugin {
18 /**
19 * @param {string | ResolveStepHook} source source
20 * @param {MainFieldOptions} options options
21 * @param {string | ResolveStepHook} target target
22 */
23 constructor(source, options, target) {
24 this.source = source;
25 this.options = options;
26 this.target = target;
27 }
28
29 /**
30 * @param {Resolver} resolver the resolver
31 * @returns {void}
32 */
33 apply(resolver) {
34 const target = resolver.ensureHook(this.target);
35 resolver
36 .getHook(this.source)
37 .tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
38 if (
39 request.path !== request.descriptionFileRoot ||
40 request[alreadyTriedMainField] === request.descriptionFilePath ||
41 !request.descriptionFilePath
42 )
43 return callback();
44 const filename = path.basename(request.descriptionFilePath);
45 let mainModule = DescriptionFileUtils.getField(
46 request.descriptionFileData,
47 this.options.name
48 );
49
50 if (
51 !mainModule ||
52 typeof mainModule !== "string" ||
53 mainModule === "." ||
54 mainModule === "./"
55 ) {
56 return callback();
57 }
58 if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
59 mainModule = "./" + mainModule;
60 const obj = {
61 ...request,
62 request: mainModule,
63 module: false,
64 directory: mainModule.endsWith("/"),
65 [alreadyTriedMainField]: request.descriptionFilePath
66 };
67 return resolver.doResolve(
68 target,
69 obj,
70 "use " +
71 mainModule +
72 " from " +
73 this.options.name +
74 " in " +
75 filename,
76 resolveContext,
77 callback
78 );
79 });
80 }
81};
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