Did you know that you can see machine codes of javascript files with Node.js?

For example;

console.log('hello')

Unoptimized machine codes;

node --print-code filename.js

Bytecodes;

node --print-bytecode filename.js

Optimized machine codes;

node --print-opt-code filname.js

Also, you can see it machine codes without using any files;

node --print-code --eval console.log('hello')