[kv85s]

Are there any real-world, production systems based on JavaScript and Python?

Toy systems, yes. Hey, I too, think CircuitPython is really neat. But I'm skeptical someone would base a PLC (or similar) on it.

[ckcheng]

Above was talking about embedded systems, and I really don’t know if the James Webb Space Telescope counts, but…

The James Webb Space Telescope runs JavaScript, apparently [1].

[1]: https://www.theverge.com/2022/8/18/23206110/james-webb-space...