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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.
From the GitHub commits and changes of the STM drivers in Espruino (targetlibs/stm32usb/Src/) back in 2015 , it looks like GWilliams was very busy and there were a ton of changes to the STM libraries to get USB working in Espruino. SO .... clearly changing existing functionality to use more recent STM libraries is not agood idea ! So approach has to be that any Host functionality is all incremental and sits beside existing device virtual com and HID. However that also makes sense, looking at the current STM host libraries in
https://www.st.com/resource/en/user_manual/dm00105256-stm32cube-usb-host-library-stmicroelectronics.pdf
... they would be a parallel set to the existing device libraries on the stack. See Attached pic.
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