is-gzip

snippet::is-gzip-buffer

Simple or drop-in replacement

This package is no longer necessary. You can check first three bytes of a buffer to detect if it is a gzip file.

// example

function isGzip(buf) {
	if (buf.length < 3) return false;
	return (
		buf[0] === 31 &&
		buf[1] === 139 &&
		buf[2] === 8
	);
}