I've been using this and a custom React wrapper at work to build an automation tool for legacy Windows apps with a lot of success: https://etacautomation.com
Blockly is vanilla JS and very easy to extend as needed (I added a better type system, for example), and their new plugin system is super helpful. Its performance isn't quite there, but I have high hopes for the future with the changes I've seen so far. The devs have been wonderful to work with, too.
Blockly is vanilla JS and very easy to extend as needed (I added a better type system, for example), and their new plugin system is super helpful. Its performance isn't quite there, but I have high hopes for the future with the changes I've seen so far. The devs have been wonderful to work with, too.