Don't use callbacks with *Sync fs methods

[humphd]

In a few places you are calling *Sync versions of fs methods, for example: here and here. You only use a callback when you use the async versions of these methods.

[sirinoks]

I actually had a bug when I used async. It would not read the file in time and won't generate the output as a result

[humphd]

If you show me some code, I can help you fix it.

[sirinoks]

Well, it's literally half of the times (especially consistent after there were index.js file changes and not output), there would be no generated files, because texts would be empty.
It might be the case tho I don't need write file sync. I'll remove that one and see what happens.