$ wc -c output.js

  117708 output.js

$ uglify-js output.js -c unsafe | node

Hello world!

$ uglify-js output.js -c unsafe | wc -c

    2740

$ uglify-js output.js -c unsafe | cut -c 1-60

(()=>{}).constructor("conso"+"".constructor["from"+(()=>{}).

$ uglify-js output.js -c unsafe | gzip | wc -c

     192