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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
As far as I know, STM32Cube was announced about a week ago, so it's not from that :(
Try this - it looks very similar to me: http://www.st.com/web/en/catalog/tools/PF259428# - specifically in
/STM32F401-Discovery_FW_V1.0.0/Libraries/STM32_USB_Device_Library/