As an orange warning? If so, it may still work - it would just be that the web IDE doesn't understand that the board contains the library.
@Gordon started
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.
As an orange warning? If so, it may still work - it would just be that the web IDE doesn't understand that the board contains the library.