This used to be valid code:
```
class Foo {
constructor() {
this.bar = ‘string’;
}
}
```
This will now fail since ‘bar’ is not explicitly
defined as a field. We now have to write:
```
class Foo {
bar:string; // << REQUIRED
constructor() {
this.bar = ‘string’;
}
}
```
The app is writen in ES6 and transpiles to ES5 and dart as part of the
usual build.
The app contains a component, a directive and a services wired together
through dependency injection.
Before Each:
- gulp build
For es5:
- gulp serve
- open 'localhost:8000/js/examples/lib/hello_world/'
For dart:
- gulp examples/pub.serve
- open 'localhost:8080'
