TYPESCRIPT

typescript promise

new Promise<boolean>((res, rej) => {
  res(true);
})
.then(res => {
  console.log(res);
  return false;
})
  .then(res => {
  console.log(res);
  return true;
})
  .then(res => {
  console.log(res);
})
  .catch(error => {
  console.log('ERROR:', error.message);
});

typescript get the promise return type

type AsyncReturnType<T extends (...args: any) => any> =
	T extends (...args: any) => Promise<infer U> ? U :
	T extends (...args: any) => infer U ? U :
	any

Get Promise type TypeScript

//return from promise
type promiseReturn<T extends Promise<unknown>> = T extends Promise<infer type>
	? type extends Promise<unknown>
		? promiseReturn<type>
		: type
	: never;
type prom = promiseReturn<Promise<string>>; //string
type prom_2 = promiseReturn<Promise<Promise<string>>>; //string