Supporting async remote functions

[Nosfistis]

Is it possible that we add a property to support async functions? I have tested it so far using Node's promisify with no problem.

Since every remote method is promisified, even callback-based ones are supported, therefore there seems to be no backward-compatibility problem, although that would set node requirements to version 8.0+. Loopback already supports it as a fallback, and it is possible that fireloop disables the support with a flag.

The required change is:

fireloop.io/lib/src/model-register/index.ts

Line 33 in 6b008a8

reference[remote] = function () { Model[remote].apply(Model, arguments); };

changing to:

const { promisify } = require('util'); // TS types might require different import

reference[remote] = async function () {
  const asyncRemote = promisify(Model[remote]);
  try {
    return await asyncRemote.apply(Model, arguments);
  } catch (err) {
    console.error(err);
  }
};