SQF Minifier is a simple, regex-based minifier for SQF files, found in ArmA, etc.
Run the minifier with Python (≥3.6):
minify.py filename_in [filename_out]
This will produce a minified copy of the file at filename_in. If filename_out is provided, the minified SQF is written there. Otherwise, the minified code will be returned to stdout.
At least in my testing, well enough. Thanks to the amazing SQF linter by LordGolias, it's possible to command-line test SQF code. If a file passes, its minified code should pass too.