ES2015 module issue with transpileOnly + decorators + interfaces

Hi there,

We have a very large Angular 2 codebase that we're attempting to move over to ts-loader; we're getting massive (4-5x) speed boosts compared to our existing awesome-typescript-loader setup, but sadly we're getting compilation issues when we turn on transpileOnly.

It only occurs when:

• Building ES2015 modules AND
• Using a class with a decorator on it AND
• The class uses an imported interface AND
• The imported interface comes from a module that also exports something concrete (e.g. a class or a const)

(webpack complains that it can't find the interface with a stack trace suggesting that it's processing harmony imports.)

I've created a repo with a standalone repro case in it: it's just tiny 2 files both of which are under 10 lines of code:

https://github.com/RoystonS/ts-loader-issue

(Is this related to what's discussed in issue #400?)

Thanks,
Royston.

Commencez par la reproduction autonome à deux fichiers sur github.com/RoystonS/ts-loader-issue et exécutez son build webpack avec transpileOnly activé. Reproduisez l’échec en utilisant des modules ES2015, une classe décorée et une interface importée depuis un module qui exporte également une valeur concrète ; c’est terminé lorsque cette combinaison compile sans l’erreur d’interface manquante ni l’erreur harmony-import.