JS code (untested) to wait for the first success, or throw the last error.

awaitFirst.js

const awaitFirst = (promises) =>
  new Promise((resolve, reject) => {
    let count = promises.length;
    promises.forEach(p =>
      p.then(resolve, (e) => {
        count = count - 1;
        if (count === 0) reject(e);
      })
    );
  });