Using ember cli 2.9 the generated ES6 syntax files will crash the ember application with a syntax exception.
Steps to Repeat

1. run ember install ember-cli-java-properties-to-object

2. Create a file /app/locales/en/loc.properties having a single line: foo=bar

3. checking the generated js app code you'll find a lost "ES6" code piece between lots of "AMD" style code:

   define('ocst/instance-initializers/ember-i18n',` ['exports', 'ember-i18n/instance-initializers/ember-i18n'], function (exports, _emberI18nInstanceInitializersEmberI18n) {
   exports['default'] = _emberI18nInstanceInitializersEmberI18n['default'];
   });
   // here comes the generated code
   export default {"foo":"bar"}
   define("ocst/locales/en/config", ...

Expected

1. Either the generated file is placed under /app/locales/en/loc.properties.js OR

2. generate AMD style syntax, whereby the generated code would look like so:
   define('ocst/locales/en/loc.properties',` ['exports', 'ocst/locales/en/loc.properties'], function (exports) {
   exports['default'] = {"foo":"bar"};
   });

The following properties file (tried both: utf-8 or ISO_8859-1):
special=\u00A9 or \u00FC or \u00DF
is converted to:

exports["default"] = { "special": "\\u00A9 or \\u00FC or \\u00DF" };

expected:

exports["default"] = { "special": "© or ü or ß" };

see java.properties at https://github.com/willemdewit/java.properties.js/blob/master/test/java.properties.js#L72)

maybe dependencies are an issue here.