How to reject in async/await syntax?

Question

How can I reject a promise that returned by an async/await function?

e.g. Originally:

Answer 1

I have a suggestion to properly handle rejects in a novel approach, without having multiple try-catch blocks.

import to from './to';

async foo(id: string): Promise {
    let err, result;
    [err, result] = await to(someAsyncPromise()); // notice the to() here
    if (err) {
        return 400;
    }
    return 200;
}

Where the to.ts function should be imported from:

export default function to(promise: Promise): Promise {
    return promise.then(data => {
        return [null, data];
    }).catch(err => [err]);
}

Credits go to Dima Grossman in the following link.