This project defines a custom element by subclassing Polymer.Element and applying a mixin. This defines the same simple element in various conditions:

• The es5 folder contains ES6 code that gets transpiled to ES5.
• The es6 folder contains ES6 code that is bundled but otherwise not transpiled.

To rebuild these versions:

1. yarn install
2. npm run es5 (to build ES5 version)
3. npm run es6 (to build ES6 version)