make-promise.js

/**
 * @param {function} func - The function to call. The payload of the promise.
 * @param {Array.<*>} args - The list of arguments for `func`.
 * @param {*} ctx - The context for `func`.
 */
function makePromise(func, args, ctx) {
  return new Promise(function (resolve, reject) {
    try {
      func.apply(ctx, Array.prototype.concat.call(args, function (err, result) {
        if (err) { reject(err); } else { resolve(result); }
      }));
    } catch (err) {
      reject(err);
    }
  });
}