Compare js file size before and after minification with uglifyJS2

comparejsmin

function comparejsmin() {
     local origsize=$(wc -c < "$1")
     local uglifysize=$(uglifyjs "$1" | wc -c)
     local ratio=$(echo "$uglifysize * 100/ $origsize" | bc -l)
     printf "Unminified file: %d bytes\n" "$origsize"
     printf "Minified file: %d bytes (%2.2f%%)\n" "$uglifysize" "$ratio"
}