forked from node-fetch/node-fetch
/
is.js
84 lines (78 loc) · 1.91 KB
/
is.js
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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/**
* Is.js
*
* Object type checks.
*/
const NAME = Symbol.toStringTag;
/**
* Check if `obj` is a URLSearchParams object
* ref: https://github.com/node-fetch/node-fetch/issues/296#issuecomment-307598143
*
* @param {*} obj
* @return {boolean}
*/
export const isURLSearchParameters = object => {
return (
typeof object === 'object' &&
typeof object.append === 'function' &&
typeof object.delete === 'function' &&
typeof object.get === 'function' &&
typeof object.getAll === 'function' &&
typeof object.has === 'function' &&
typeof object.set === 'function' &&
typeof object.sort === 'function' &&
object[NAME] === 'URLSearchParams'
);
};
/**
* Check if `object` is a W3C `Blob` object (which `File` inherits from)
*
* @param {*} obj
* @return {boolean}
*/
export const isBlob = object => {
return (
object &&
typeof object === 'object' &&
typeof object.arrayBuffer === 'function' &&
typeof object.type === 'string' &&
typeof object.stream === 'function' &&
typeof object.constructor === 'function' &&
/^(Blob|File)$/.test(object[NAME])
);
};
/**
* Check if `obj` is a spec-compliant `FormData` object
*
* @param {*} object
* @return {boolean}
*/
export function isFormData(object) {
return (
typeof object === 'object' &&
typeof object.append === 'function' &&
typeof object.set === 'function' &&
typeof object.get === 'function' &&
typeof object.getAll === 'function' &&
typeof object.delete === 'function' &&
typeof object.keys === 'function' &&
typeof object.values === 'function' &&
typeof object.entries === 'function' &&
typeof object.constructor === 'function' &&
object[NAME] === 'FormData'
);
}
/**
* Check if `obj` is an instance of AbortSignal.
*
* @param {*} obj
* @return {boolean}
*/
export const isAbortSignal = object => {
return (
typeof object === 'object' && (
object[NAME] === 'AbortSignal' ||
object[NAME] === 'EventTarget'
)
);
};