Type Alias AwaitedReturnType<F>

AwaitedReturnType: F extends (...args: any[]) => infer R
? R extends Promise<infer U> ? U : R
: never

Get the awaited return type of a function.

Type Parameters

F
Function type

Remarks

Combines return type extraction with automatic Promise unwrapping. It's come in handy when dealing with async functions.

Example

type F1 = () => string;
type R1 = AwaitedReturnType< F1 >;  // string
type F2 = () => Promise< number >;
type R2 = AwaitedReturnType< F2 >;  // number