is.ts
1.73 KB
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
const toString = Object.prototype.toString;
export function is(val: unknown, type: string) {
return toString.call(val) === `[object ${type}]`;
}
export const isDef = <T = unknown>(val?: T): val is T => {
return typeof val !== 'undefined';
};
export const isUnDef = <T = unknown>(val?: T): val is T => {
return !isDef(val);
};
export const isObject = (val: any): val is Record<any, any> => {
return val !== null && is(val, 'Object');
};
export function isDate(val: unknown): val is Date {
return is(val, 'Date');
}
export function isNull(val: unknown): val is null {
return val === null;
}
export function isNumber(val: unknown): val is number {
return is(val, 'Number');
}
export function isPromise<T = any>(val: unknown): val is Promise<T> {
return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch);
}
export function isString(val: unknown): val is string {
return is(val, 'String');
}
export const isFunction = (val: unknown): val is Function => typeof val === 'function';
export function isBoolean(val: unknown): val is boolean {
return is(val, 'Boolean');
}
export function isRegExp(val: unknown): val is RegExp {
return is(val, 'RegExp');
}
export function isArray(val: unknown): val is Array<any> {
return val && Array.isArray(val);
}
export const isClient = () => {
return typeof window !== 'undefined';
};
export const isWindow = (val: any): val is Window => {
return typeof window !== 'undefined' && is(val, 'Window');
};
export const isElement = (val: unknown): val is Element => {
return isObject(val) && !!val.tagName;
};
export const isServer = typeof window === 'undefined';
export function isImageDom(o: Element) {
return o && ['IMAGE', 'IMG'].includes(o.tagName);
}