JS Arrow Functions Parentheses

There is Remove unnecessary parentheses quick fix, available on Alt+Enter:

Thanks!

Is there any way to add that into the codestyle formatter, to have it perform that option on the whole file?

You can:

• Alt+Enter, then select Fix all 'unnecessary parentheses' problems in file to fix all parentheses in file
• Alt+Enter, then Cleanup code to fix this and all similar 'safe' problems

Just wanted to share the solution to my problem as well.

I'm using Prettier for reformatting with a custom keymap (Shift + Cmd + P) and it added an unnecessary parentheses on every format.

Setting Prettier config property arrowParens to "avoid" removes the unnecessary parentheses, like this:

"arrowParens": "avoid"

Prettier documentation here