using ES6 Proxy to deal with methods of Promise'd objects. not sure how useful this is yet.

proxy-promise.js

// using ES6 Proxy to deal with methods of Promise'd objects. works for me in Edge though not Chrome somehow.
let handler = {
  get: (target, prop) => function() {
    if(target instanceof Promise) {
      let args = arguments;
      return target.then((o) => o[prop].apply(o, args));
    } else {
      let value = target[prop];
      return typeof value == 'function' ? value.bind(target) : value;
    }
  }
};

let obj = { greet: (name) => console.log('Hey ' + name) };
let later = (v) => new Promise((resolve, reject) => setTimeout(() => resolve(v), 1000))
let prom = later(obj);
let greeter = new Proxy(prom, handler);
greeter.greet('you');