How to Proxy a Promise in JavaScript es6 -

i'm trying proxy promise in native firefox (and using babel).

var prom = new promise(function(resolve, reject){resolve(42)});  var promproxy = new proxy(prom, {});  promproxy.then(function(response){console.log(response)});

this doesn't work, 'typeerror: 'then' called on object not implement interface promise.'

you need have handler implement get() trap , return bound version of prom.then

var prom = new promise(function(resolve, reject){resolve(42)}); var promproxy = new proxy(prom, {   get: function(target, prop) {     if (prop === 'then') {       return target.then.bind(target);     }   } }); promproxy.then(function(response){console.log(response)}); 

note if want proxy all accessors, get function this:

var promproxy = new proxy(prom, {   get: function(target, prop) {     var value = target[prop];     return typeof value == 'function' ? value.bind(target) : value;   } }); 

bind ensure function won't incorrectly called when you're dealing native objects such promises, or console.

edit: in instances browsers / node have outdated version of proxies, in case you'll want use harmony-reflect bring date.