When trying to resolve a non-existent symbol resolver returns _kind='css' and symbol is undefined

[tempit]

:import{
    -st-from: "./import.st.css";
    -st-named: shlomo;
}

In this case, import.st.css has no shlomo. When calling resolver.resolve for shlomo, we get a result with _kind='css', but symbol is undefined.

Buggy code is at:

stylable/src/stylable-resolver.ts

Line 63 in e6d61bc

return { _kind: 'css', symbol, meta } as CSSResolve;

Should check if symbol exists, and set _kind to 'invalid' or 'unknown' otherwise.

[idoros]

Discussed and the issue is mostly a type issue, where the symbol should be optional or symbol of _kind: undefined.