I am getting back to developing libraries to share across projects and wondering if there is something I can do to get IntelliSense working for the code in the library .h and .cpp files.  I realize that I cannot compile an Arduino Library project directly so I include another project in the same solution with a simple .ino file to test the library code.  The test program and library compile fine, but IntelliSense doesn't recognize any of the standard classes of Arduino defines (see attached screen shot) in either the .h or .pp files containing the library code.  (IntelliSense works fine for the test .ino file.)

Ugh - I forgot to add the reference.  That's on me and I am sorry to have taken your time for it, but thank you all the same.

Build output is attached - didn't realize it might help since I wasn't compiling the library directly, but will try hard to always include it going forward.