2
>
3
>
/**
4
>
* A type that represents undefined or null
5
>
*/
6
>
export type nil = undefined | null;
7
>
8
>
/**
9
>
* An object whose all properties have the same type.
10
>
*/
11
>
export type Dictionary<T = any> = {[key: string]: T};
12
>
13
>
/**
14
>
* Returns the keys of T that match Dictionary<U> and are not arrays.
15
>
*/
16
>
export type DictionaryKeyof<T, U = any> = Exclude<
17
>
KeyOf<T, Dictionary<U>>,
18
>
KeyOf<T, any[]>
19
>
>;
20
>
21
>
/**
22
>
* Returns the keys of T that match U.
23
>
*/
24
>
export type KeyOf<T, U> = Exclude<
25
>
{[K in keyof T]: T[K] extends U ? K : never}[keyof T],
26
>
undefined
27
>
>;
28
>
29
>
/**
30
>
* An array whose first element is not undefined.
31
>
*/
32
>
export type NotEmptyArray<T = any> = [T, ...T[]];
33
>
34
>
/**
35
>
* Returns the type of a Dictionary or array values.
36
>
*/
37
>
export type ValueOf<T> = T extends (infer U)[] ? U : T[keyof T];
38
>
39
>
/**
40
>
* Typing wrapper around assert.notStrictEqual()
41
>
*/
42
>
export function assertNotStrictEqual<N, T>(
43
actual: T | N,
44
expected: N,