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 :
anytypescript get type from promise
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>> // => numberCopyright © 2021 Codeinu
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