Adding 'Built-in' code

@tve, I see that... but how do you get it 'there'.... usually with a 'sketch' you build in a supporting environment such as the IDE... and the 'daily' things using it as a base do not include it your 'regular sketches'. It could be considered something like dynamically extend the build...

Delivering though a finished package - which makes both parts a one-time things - could support this funcitonality. It is then just one file (sketch) to upload and save(), and the espruino is 'programmed'.