How stop my IDE from showing hidden files on Sierra?
It's up to individual apps to decide whether to show hidden files and to provide options to change it.
- The ‘AppleShowAllFiles’ key is written to ‘com.apple.Finder’, so it only applies in Finder. Finder's GUI option for changing this setting is ⇧⌘..
- Other apps may have their own options, which you'll need to investigate on a per-app basis. For example, How do I hide certain files from the sidebar in Visual Studio Code?.