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
typescript 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>> // => number
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