Typescript: An async function or method in ES5/ES3 requires the 'Promise' constructor

Asked Mar 09 '23 at 20:42

Active Mar 09 '23 at 21:36

Viewed 185 times

I try to compile an example code (app.ts) using an async function by using VScode but cannot get it without errors.

const request = async () => {
    const response = await fetch('https://pokeapi.co/api/v2/pokemon/ditto');
    const json = await response.json();
    console.log(json);
}

Got this error message :

"Typescript: An async function or method in ES5/ES3 requires the 'Promise' constructor".

Now I added "lib": [ "ES2015", "DOM"] to the tsconfig.json file and did a "tsc" in terminal and then tried it again "tsc app.ts". But I still get the same error.
I saw other people resolved this problem by adding these lines to the tsconfig.json, but it didn´t help for me. The compiler seems to take into account the tsconfig.json cause I tested by changing the outDir. "tsc" or "tsc -p tsconfig.json" are successful.

Target in compiler options is "es2016"

edited Mar 09 '23 at 20:46

Ahmed Sbai

10,695
9
19
38

asked Mar 09 '23 at 20:42

Rudi Heribert Mentär

you have to istall this package too `npm install --save @types/es6-promise` – Ahmed Sbai Mar 09 '23 at 20:48
Unsure if relevant: https://stackoverflow.com/a/68318759/3509591 – Zze Mar 09 '23 at 21:00
[this](https://stackoverflow.com/a/48976287/13488990) may help too – Ahmed Sbai Mar 09 '23 at 21:19
`npm install --save @types/es6-promise` and `"lib": [ "ES2015", "DOM" , "es2015.promise" ]` did not help – Rudi Heribert Mentär Mar 09 '23 at 21:47
Include your full tsconfig – kelsny Mar 09 '23 at 22:10

Typescript: An async function or method in ES5/ES3 requires the 'Promise' constructor

0 Answers0