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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.
@Gordon
Maybe you could strip this down to just one or two functions that exhibit the problem? And also check that is happens on one of our builds - preferably on one of our boards like the Pico.
If it says
WARNING: If specifying an object, it must be of the form {data : ..., count : N}my guess somehow an object is getting passed into one of the functions (like write?)But actually my guess is you're building with an out of date firmware, and building for ESP8266 - I saw a regression that looked a bit like this yesterday and fixed it, and you might not have updated since then?