These file sizes are non-uglify, non-gzipped and without any method of compression on OSX.
let - var
- 3 bytes for the first rename.
- 4 bytes for each subsequent rename.
const - var
- Save 1 byte per declaration.
- 852 bytes for using simple class declaration with a constructor. Adds two new functions, namely, _createClass and _classCallCheck.
- 2114 bytes for creating and extending a class.
- Extending a class adds two more functions let us have a look at them, namely,
_get and _inherits.