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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.
@fanoush
Indeed it looks like there is no api call for getting the size but I followed link provided by Robin in one of yours previous storage based topics and found this reply http://forum.espruino.com/conversations/329768/#14577636
So if you really need the size now you can possibly iterate over those numbered file parts and add the length number as a workaround.