R# doesn't recognize new typescript files

I'm working with VS 2017 and R# 2017.1.1 on a AngularJS / ASP.NET Core solutiion.

When i copy typescript files into my solution directory with the explorer, VS automatically detects the new files and shows them in the solution explorer. But when i open such a file in the editor i don't have any R# intellisense. A restart of VS fixes the problem.

I just copied the .ts files, not the generated .js and .js.map files.

Update: i got a similar behavior as i copied .css files. VS recognize the new files and update the solution explorer. When i reference the copied css in the <sytlesheet> tag i get a blue squirrel and R# said that the file doesn't exist. After VS restart the problem is gone.

Regards

Andreas