ReturnType
Return type constructs a type consisting of the return type of function Type.
type T0 = ReturnType<() => string>;
// type T0 = string
type T1 = ReturnType<(s: string) => void>;
// type T1 = void
type T2 = ReturnType<<T>() => T>;
// type T2 = unknown
type T3 = ReturnType<<T extends U, U extends number[]>() => T>;
// type T3 = number[]
declare function f1(): { a: number; b: string };
type T4 = ReturnType<typeof f1>;
// type T4 = {
// a: number;
// b: string;
// }
type T5 = ReturnType<any>;
// type T5 = any
type T6 = ReturnType<never>;
// type T6 = never
type T7 = ReturnType<string>;
// ^ Type 'string' does not satisfy the constraint '(...args: any) => any'.
type T8 = ReturnType<Function>;
// ^ Type 'Function' does not satisfy the constraint '(...args: any) => any'.Learn more from the following links: