Javascript Promise.all object with object implementation

PromiseAllObject.js

module.exports = (obj) => {
  const entries = Object.entries(obj);
  return Promise
    .all(entries.map(([, v]) => v))
    .then(results => results
      .reduce((accumulator, value, idx) => {
        const [key] = entries[idx];
        accumulator[key] = value;
        return accumulator;
      }, {}));
};