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debkanchan/promised_returned_type.ts

Last active December 26, 2021 19:07
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Get Promised return type of an async function in TypeScript
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promised_returned_type.ts
type PromisedReturnType<T extends (...args: any) => any> = T extends (...args: any[]) => PromiseLike<infer R> ? R : any
//usage
async function f1() {
return "Value";
}
async function f2(): Promise<number> {
return Promise.resolve(5);
}
type returnTypeoff1 = PromisedReturnType<typeof f1>; //string
type returnTypeoff2 = PromisedReturnType<typeof f2>; //number
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TS 4.5 announces Awaited keyword which does the same thing but better please use that now

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