warn() arguments are not being transpiled

[Turbo87]

warn(...arguments);

is apparently being transpiled to

 (false && _ember.default.warn(...arguments));

but ...arguments is ES6 code, which ember-cli-uglify@1 is not able to handle.

see mainmatter/ember-simple-auth#1443

/cc @rwjblue

[simonihmig]

Just ran into the same issue, reported here: emberjs/ember-cli-babel#184

Interestingly other ES transpilation seems to work, at least string templates:

This file is transpiled to:

define('ember-warn-transpilation/utils/foo', ['exports'], function (exports) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = foo;
  function foo() {
    var name = 'foo';
    var args = ['foo'];
    (true && Ember.warn('you should not use ' + name));
    (true && Ember.warn(...args));

    return 'foo';
  }
});

So string templates work, spread operator not! 🤔