Created
July 18, 2022 10:00
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Typescript nested object paths
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type AnyObject = Record<string, unknown>; | |
export type Join<K, P> = K extends string | number | |
? P extends string | number | |
? `${K}${'' extends P ? '' : '.'}${P}` | |
: never | |
: never; | |
export type Prev = [ | |
never, | |
0, | |
1, | |
2, | |
3, | |
4, | |
5, | |
6, | |
7, | |
8, | |
9, | |
10, | |
11, | |
12, | |
13, | |
14, | |
15, | |
16, | |
17, | |
18, | |
19, | |
20, | |
...0[] | |
]; | |
// noinspection JSUnusedGlobalSymbols | |
export type Paths<T, D extends number = 10> = [D] extends [never] | |
? never | |
: T extends AnyObject | |
? { | |
[K in keyof T]-?: K extends string | number ? `${K}` | Join<K, Paths<T[K], Prev[D]>> : never; | |
}[keyof T] | |
: ''; | |
export type Leaves<T, D extends number = 10> = [D] extends [never] | |
? never | |
: T extends AnyObject | |
? { [K in keyof T]-?: Join<K, Leaves<T[K], Prev[D]>> }[keyof T] | |
: ''; |
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