Neumatic simulator open source and programmed in JavaScript

[Picuino]

I am currently using a Flash-based (outdated) pneumatics simulator with Ruffle emulator in order to use it.
I would like to be able to find a simulator that I could improve (open source) and with more current technology (programmed in JavaScript).

Does anyone know one?

Neumatic simulator: https://www.picuino.com/_static/flash/simulador-neumatica.html
Ruffle (Flash emulator): https://ruffle.rs/