Thank you. But here are my concerns:

* If I go ES6 I'll require all people importing it to also use an ES6 module bundler -- which means Babel only, or Rollup, which never works.

* If I precompile and expect non-Babel people to use the precompiled then these people will have duplicated dependencies everywhere.

Not complaining, but all this compatibility mess seems hard to me. I use Browserify!