These are far from perfect, but still something: https://github.com/andrei-markeev/ts2c/ https://github.com/andrei-markeev/ts2c/ https://github.com/evanw/thin

These are far from perfect, but still something: https://github.com/andrei-markeev/ts2c/ https://github.com/andrei-markeev/ts2c/ https://github.com/evanw/thinscript https://github.com/evanw/thinscript If you aim for 32 bit microcontrollers then you can go with assemblyscript to wasm and then with wasm to C transpiller