Right now, I'd say Chromebook and/or Android. Google have been putting a lot of work into it.
Probably closely followed by MacOS. Raspberry Pi 3 + Node.js Noble also seems relatively good at the moment, once you have it set up
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Right now, I'd say Chromebook and/or Android. Google have been putting a lot of work into it.
Probably closely followed by MacOS. Raspberry Pi 3 + Node.js Noble also seems relatively good at the moment, once you have it set up