how much code may be sent to BBC micro:bit?

Hi folks,

given the low amount of free memory in a BBC micro:bit

>process.memory()
={ free: 280, usage: 20, total: 300, history: 0,
  gc: 0, gctime: 2.83813476562, blocksize: 12, "stackEndAddress": 536884560, flash_start: 0,
  "flash_binary_end": 258580, "flash_code_start": 260096, flash_length: 262144 }

is there an estimate of how much code may be sent to that device without causing a LOW_MEMORY error?

That code should also be able to be saved, of course.

Or, is there way to build larger code from smaller pieces (e.g. by saving individual functions rather than a whole bunch of them)?

Thanks in advance for any help!

With greetings from Germany,

Andreas Rozek