refactor(authentication): simplify decorators import path

[Yaty]

Use decorators index when importing

Checklist

• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

[Yaty]

Hmm, I do not understand why prettier is failing on Travis. The error is really not clear.
It's passing on my machine and my branch is updated.
Any ideas ?

[raymondfeng]

@Yaty It seems that Travis build picks up a newer version of prettier (prettier@1.15.1), which causes a few files to be reformatted.

Please upgrade to prettier@1.15.1 in packages/build/package.json and run npm i && npm run lint:fix again to add the formatting changes.

[hacksparrow]

I am opening a PR to update prettier.

[hacksparrow]

Here is the PR - #1993. Let's land this ASAP.

[raymondfeng]

Please note importing from the target file is not bad. Sometimes it's even necessary to avoid circular dependencies. If a module does not have side-effect code at top level, either way is fine.

[Yaty]

Absolutely, I'll keep your comment in my mind :)
Here this is just syntactic sugar to ease import of a "future" new decorator.