Type Alias Promisify<F>

Promisify: F extends (...args: infer A) => infer R
? (...args: A) => Promise<R>
: never

Promisify a function type

type Fn = (a: string, b: number) => boolean;
type PromisifiedFn = Promisify<Fn>; // (a: string, b: number) => Promise<boolean>