JavaScript minifier

This tool strips comments and collapses whitespace. It never renames a variable, reorders a statement, or rewrites an expression, so it shrinks less than a real minifier like Terser would. Keep mode preserves every source line break, which is what automatic semicolon insertion is defined over; one-line mode joins the output and inserts an explicit semicolon where a return, throw, break, continue, yield, or a newline postfix relied on that break. A clean run is not a claim that the source parses.