I created a bare project with webpack with only one loader, ts-loader. Webpack is failing due to the following error:
ERROR in ./app.ts Module build failed: Type
This was an issue where ts-loader was pulling in TypeScript 1.5 which had breaking changes instead of sticking with TypeScript 1.4. I've pushed out a new version (0.3.4) that should take care of this. Sorry for the problem.