and play with indent size, tab size, use tab character etc... but no change seems to have effect on existing (and new) JavaScript files.
Any idea about how to achieve it? Might some general setting prevent this changes to take effect?
解决方案
Do you have .editorconfig file in your project? Settings from there will overwrite your Code Style settings (and that is expected behaviour -- that's the whole nature/purpose of EditorConfig plugin).
P.S.
IDE should notify you about such behaviour (does for me). For example:
