Compiling our Web project with the latest Web core (V2.6. beta), FNC Core (3.1.7.1) and FNC Wx Pack (1.6.3.1) versions, we get the pas2js transpiler warning:
[Warnung] WEBLib.TMSFNCWXHTMLMemo.pas(341): Unknown custom attribute "FNCJSLibReferenceAttribute"
Though it doesn't seem to affect runtime, it avoids having a clean protocol within the QA process.