It does seem that the unminified code is very close to the original. In some cases ChatGPT even did its own refactoring in addition to the unminification:

    // ORIGINAL:
    j.useEffect(() => {
        function r() {
            n({ height: window.innerHeight, width: window.innerWidth });
        }
        if (typeof window < "u") return n({ height: window.innerHeight, width: window.innerWidth }), window.addEventListener("resize", r), () => window.removeEventListener("resize", r);
    }, []),

    // UNMINIFIED:
    useEffect(() => {
      const handleResize = () => {
        setSize({ height: window.innerHeight, width: window.innerWidth });
      };

      // Initial size setting
      handleResize();

      window.addEventListener('resize', handleResize);
      return () => {
        window.removeEventListener('resize', handleResize);
      };
    }, []);

Note that the original code doesn't call `handleResize` immediately, but have its contents inlined instead. (Probably the minifier did the actual inlining.) The only real difference here is a missing `if (typeof window < "u")` condition.