[z3t4]

Can you give an example of a bundler that removes dead code and not just minifies it? Dead code removal in JS is a bit tricky, unless we are only talking about code after return statements and other low hanging fruit.

[kaoD]

IIRC as long as you use ES modules, tree-shaking is trivial?

EDIT: not that trivial https://webpack.js.org/guides/tree-shaking/

[z3t4]

Hmm. Now that we have async functions meybe we could also add the pure keyword in order to help optimizations.