.jshintrc has no effect?

Hi all,

I'm trying to suppress the messages like "'let' is available in ES6...". I placed the following content in .jshintrc in the project root (near .project):
```
{
"esversion": 6,
"node": true
}

```
This is then visible in the project settings under JSHint->Configuration.
Still, neither this, nor placing the same content in global preferences, does not switch off the warning.
The only thing that helps, is adding the JSHint comment (/* jshint esversion: 6 */) in each and every file, which does not scale for a large project.

Am I missing something in my setup?

Thanks in advance.