aMap(
  arr: T[], 
  cb: (value: T, index: number) => Promise<unknown>
): Promise<unknown[]>

import { aMap } from "@opentf/std";
 
aMap([], async (value, index) => {});

const arr = [1, 2, 3, 4, 5];
 
function multiply(n, i) {
  return new Promise((resolve) => {
    resolve(n * i);
  });
}
 
const result = await aMap(arr, async (n, i) => await multiply(n, i));
console.log(result); // [0, 2, 6, 12, 20]