优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
"use strict";
 
const path = require("path");
 
module.exports = class MainFieldPlugin {
    constructor(source, options, target) {
        this.source = source;
        this.options = options;
        this.target = target;
    }
 
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        resolver
            .getHook(this.source)
            .tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
                if (request.path !== request.descriptionFileRoot) return callback();
                if (request.alreadyTriedMainField === request.descriptionFilePath)
                    return callback();
                const content = request.descriptionFileData;
                const filename = path.basename(request.descriptionFilePath);
                let mainModule;
                const field = this.options.name;
                if (Array.isArray(field)) {
                    let current = content;
                    for (let j = 0; j < field.length; j++) {
                        if (current === null || typeof current !== "object") {
                            current = null;
                            break;
                        }
                        current = current[field[j]];
                    }
                    if (typeof current === "string") {
                        mainModule = current;
                    }
                } else {
                    if (typeof content[field] === "string") {
                        mainModule = content[field];
                    }
                }
                if (!mainModule) return callback();
                if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
                    mainModule = "./" + mainModule;
                const obj = Object.assign({}, request, {
                    request: mainModule,
                    alreadyTriedMainField: request.descriptionFilePath
                });
                return resolver.doResolve(
                    target,
                    obj,
                    "use " +
                        mainModule +
                        " from " +
                        this.options.name +
                        " in " +
                        filename,
                    resolveContext,
                    callback
                );
            });
    }
};