TypeScript Returned Value From Object Method By Key

ReturnedValueFromObjectMethodByKey.ts

/**
 * example:
 * const aObj = {
 *    b: () => 42,
 *    c: () => "hello"
 * }
 * type ObjExample = ReturnedValueFromObjectMethodByKey<typeof aObj>;
 * ObjExample type will be: {b: number; c: string}
 */

export type ReturnedValueFromObjectMethodByKey<T> = {
  [K in keyof T]: T[K] extends (...args: any) => any ? ReturnType<T[K]> : T[K];
};