Yes, it goes back to ES3. Babel does have a neat automatic polyfill system typescript doesn't. But both can target real old JS versions. Most JS packages you'l

Yes, it goes back to ES3. Babel does have a neat automatic polyfill system typescript doesn't. But both can target real old JS versions. Most JS packages you'll find on NPM are still ES5. Transpilers are quickly making JS a compiled language where the bytecode format is ES5 :)