Need to support JS methods with names that are not valid Dart keywords

[ioancristea]

Hi
Describe the issue you're seeing
I try to make a Dart version of the firebase 3 js. I need to create an external 'catch' method.

Does it happen in Dartium or when compiled to JavaScript?
When compiled to JavaScript

• Dart SDK version: use dart --version
  Dart VM version: 1.16.0 (Tue Apr 26 14:18:21 2016) on "linux_x64"
• pkg/js version: look at pubspec.lock
  js: ^0.6.0

Failing code:

@JS('Promise')
class Promise {
  external Promise(resolver);

  external all(List<Promise> values);
  external reject(error);
  external resolve(value);
  external catch([onReject]);
  external then([onResolve, onReject]);
}

Also i recive that error

FIREBASE WARNING: Exception was thrown by user callback. NoSuchMethodError: method not found: 'call'
Receiver: Closure 'AppComponent_closure'
Arguments: [null, null]
    at dart.wrapException (http://localhost:8080/main.dart.js:2818:17)
    at AppComponent_closure.dart.Object.noSuchMethod$1 (http://localhost:8080/main.dart.js:21524:17)
    at J.noSuchMethod$1$ (http://localhost:8080/main.dart.js:26288:39)
    at dart.Primitives_functionNoSuchMethod (http://localhost:8080/main.dart.js:2723:16)
    at dart.Primitives__genericApplyFunctionWithPositionalArguments (http://localhost:8080/main.dart.js:2758:20)
    at dart.Primitives_applyFunctionWithPositionalArguments (http://localhost:8080/main.dart.js:2744:16)
    at dart._callDartFunctionFast (http://localhost:8080/main.dart.js:23496:16)
    at http://localhost:8080/main.dart.js:23488:18
    at https://www.gstatic.com/firebasejs/3.0.2/firebase.js:346:688
    at https://www.gstatic.com/firebasejs/3.0.2/firebase.js:541:48

when i call this (the error is in allowInterop, without this is working fine)

firebase.database().ref('manufacturers').set(new firebase.TestSet(name: 'wefwef'), allowInterop(([error]) {
      window.console.debug('ss');
    }));

[DisDis]

possible duplicate #25785

[jacob314]

for method names that are not valid dart names you have to prefix them with
JS$
so
JS$catch
That will work in dart2js but support still needs to be added for dartium but will be straightforward to add.

[jacob314]

This is the same issue as #26718