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[SupportedOSPlatform("browser")] // suppress CA1416 '...' is only supported on: 'browser'
public static partial class Code
{
    [JSExport]
    public static string NameOf([JSMarshalAs<JSType.Any>] object entity)
        => ((IHasName)entity).Name;
}

[SupportedOSPlatform("browser")] // suppress CA1416 "only supported on: 'browser'"
public static partial class Code
{
    [JSExport]
    public static string NameOf([JSMarshalAs<JSType.Any>] object entity)
        => ((IHasName)entity).Name;
}

Note: this is not a Blazor app, but AFAICT Microsoft didn't give a name to its .NET-in-WebAssembly system. If you're reading this Microsoft, please give your system a name so that people can discuss it properly. I see "blazor" in the error message above, but Blazor is a UI-in-C# system and I'm not doing any UI work in C#.