Extending HTMLElement and Babel

[oravecz]

There exist plugins for Babel that work around some issues when transpiling web components. The plugins (e.g. https://github.com/WebReflection/babel-plugin-transform-builtin-classes) wrap classes that extend HTMLElement (or any other native class you care to specify) during transpilation.

However, when using mixwith.js, the fact that a class extends HTMLElement is hidden from the babel plugin at build time since it is passed as a function parameter. Is there any way to use mixwith, while still using the class MyElement extends HTMLElement syntax?