JVM alternatives to JS

This repo contains different implementations of a simple counter application in the following Java-based technologies:

• CheerpJ
• GWT
• JSweet
• TeaVM
• Vaadin Flow

bck2brwsr example is broken - I couldn't get it working.

For comparison, it also contains the following other implementations:

• React.js
• Dart

Code for blog post: Comparing JVM alternatives to JavaScript.