Go-like error handling with Typescript.

wrapErr.ts

export async function wrapErr<T>(p: Promise<T>): Promise<[any, T | undefined]> {
	try {
		return [undefined, await p];
	} catch (err) {
		return [err, undefined];
	}
}

let [err, value] = await wrapErr(somePromiseFunc());
if (err) {
	console.error(err)
	return;
}

// TS thinks the value can still be undefined,
// but we know that if we didn't have an error,
// the value is defined.
// The ! postfix operator tells TS it's defined.
use(value!)