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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.
@Wilberforce
@mike_k
As I believe there's only one file buffer you need to stick to either fs or fileopen calls. Every fileopen should be followed by a f.close()
See here:
https://www.espruino.com/File+IO