mirror of
https://github.com/sindresorhus/type-fest.git
synced 2025-12-08 19:25:05 +00:00
26 lines
510 B
TypeScript
26 lines
510 B
TypeScript
import type {IsEqual} from './is-equal';
|
|
|
|
/**
|
|
Returns a boolean for whether two given types are both true.
|
|
|
|
Use-case: Constructing complex conditional types where multiple conditions must be satisfied.
|
|
|
|
@example
|
|
```
|
|
import type {And} from 'type-fest';
|
|
|
|
And<true, true>;
|
|
//=> true
|
|
|
|
And<true, false>;
|
|
//=> false
|
|
```
|
|
|
|
@see {@link Or}
|
|
*/
|
|
export type And<A extends boolean, B extends boolean> = [A, B][number] extends true
|
|
? true
|
|
: true extends [IsEqual<A, false>, IsEqual<B, false>][number]
|
|
? false
|
|
: never;
|