Function asKey

asKey<T = string | number>(key: unknown): T & (string | number)
Casts an unknown value to a type that extends string or number. Used to ensure a value can be safely used as an object key.
Type Parameters
- T = string | number
  Target type to cast to (default: string | number).
Parameters
- key: unknown
  The value to cast.
Returns T & (string | number)
The value cast as type T & (string | number).
Example
```
const myKey = asKey('123'); // typed as string | number
```
Source
```
export const asKey = <T = string | number>(key: unknown): T & (string | number) => (
  key as T & (string | number)
)
```