Get Promise type TypeScript

Husnain Syed answered on May 9, 2020 Popularity 10/10 Helpfulness 2/10

answer Get Promise type TypeScript

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Get Promise type TypeScript

Comment

//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

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Source: Grepper

Tags: get promise typescript

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Contributed on May 28 2022

Husnain Syed

0 Answers Avg Quality 2/10

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typescript promise

Comment

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);
});

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Source: blog.bitsrc.io

Tags: promise

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Contributed on May 09 2020

Jolly Jackal

0 Answers Avg Quality 2/10

typescript get the promise return type

Comment

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

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Source: Grepper

Tags: get

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Contributed on Jun 14 2021

florinrelea

0 Answers Avg Quality 2/10

typescript get type from promise

Comment

-1

function promiseOne() {
  return Promise.resolve(1)
}
    
const promisedOne = promiseOne()
    
// note PromiseLike instead of Promise, this lets it work on any thenable
type ThenArg<T> = T extends PromiseLike<infer U> ? U : T
    
type PromiseOneThenArg = ThenArg<typeof promisedOne> // => number
// or
type PromiseOneThenArg2 = ThenArg<ReturnType<typeof promiseOne>> // => number

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Source: stackoverflow.com

Tags: get

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Contributed on May 27 2021

Annoyed Alpaca

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Get Promise type TypeScript

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Get Promise type TypeScript

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