Filipe Silva 28e66f352d fix(@angular/cli): improve rebundling speed
Forcing TypeScript to output commonjs modules instead of es2015 modules drastically improves rebuild speeds, especially for AOT.

This PR forces this option on the following modes:
- `ng build --watch --target=development`
- `ng serve --target=development`
- `ng test --code-coverage=false`

Please note that `--target=development` and `--code-coverage=false` are the defaults.

See https://github.com/webpack/webpack/issues/5863 for the webpack issue.
2017-10-20 11:00:51 -07:00
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