34 lines
880 B
Plaintext
34 lines
880 B
Plaintext
// Can eventually be replaced with the built-in once this library supports
|
|
// TS5.4+ only. Tracked in https://github.com/sindresorhus/type-fest/issues/848
|
|
type NoInfer<T> = T extends infer U ? U : never;
|
|
|
|
/**
|
|
Returns a boolean for whether the given type is `any`.
|
|
|
|
@link https://stackoverflow.com/a/49928360/1490091
|
|
|
|
Useful in type utilities, such as disallowing `any`s to be passed to a function.
|
|
|
|
@example
|
|
```
|
|
import type {IsAny} from 'type-fest';
|
|
|
|
const typedObject = {a: 1, b: 2} as const;
|
|
const anyObject: any = {a: 1, b: 2};
|
|
|
|
function get<O extends (IsAny<O> extends true ? {} : Record<string, number>), K extends keyof O = keyof O>(obj: O, key: K) {
|
|
return obj[key];
|
|
}
|
|
|
|
const typedA = get(typedObject, 'a');
|
|
//=> 1
|
|
|
|
const anyA = get(anyObject, 'a');
|
|
//=> any
|
|
```
|
|
|
|
@category Type Guard
|
|
@category Utilities
|
|
*/
|
|
export type IsAny<T> = 0 extends 1 & NoInfer<T> ? true : false;
|