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"Microvium JavaScript engine for Microcontrollers takes about 8.5 kB of ROM and 34 bytes of RAM per VM while idle, making it possibly the smallest JavaScript engine to date"
https://coder-mike.com/blog/2022/06/11/microvium-is-very-small/
@lupyuen quick glance and the C interface look pretty nice. I've used duktape a couple of times and it's interface is..... terse