clockworklabs/SpacetimeDB · error · InvalidOperationException

Enum {type} does not have a [SpacetimeDB.Type] attribute

Error message

Enum {type} does not have a [SpacetimeDB.Type] attribute

What it means

Error "Enum {type} does not have a [SpacetimeDB.Type] attribute" thrown in clockworklabs/SpacetimeDB.

Source

Thrown at crates/bindings-csharp/BSATN.Codegen/Utils.cs:162

                ? "SpacetimeDB.BSATN.ByteArray"
                : $"SpacetimeDB.BSATN.Array<{elementType}, {GetTypeInfo(elementType)}>",
            _ => throw new InvalidOperationException($"Unsupported type {type}"),
        };

        static string GetTypeInfoForNamedType(INamedTypeSymbol type)
        {
            if (type.TypeKind == Microsoft.CodeAnalysis.TypeKind.Error)
            {
                throw new UnresolvedTypeException(type);
            }
            if (type.TypeKind == Microsoft.CodeAnalysis.TypeKind.Enum)
            {
                if (
                    !type.GetAttributes()
                        .Any(a => a.AttributeClass?.ToString() == "SpacetimeDB.TypeAttribute")
                )
                {
                    throw new InvalidOperationException(
                        $"Enum {type} does not have a [SpacetimeDB.Type] attribute"
                    );
                }
                return $"SpacetimeDB.BSATN.Enum<{SymbolToName(type)}>";
            }
            var result = type.OriginalDefinition.ToString() switch
            {
                // {U/I}{128/256} are not treated by C# as regular primitives, so we need to match them by type name.
                "System.Int128" => "SpacetimeDB.BSATN.I128",
                "System.UInt128" => "SpacetimeDB.BSATN.U128",
                "SpacetimeDB.I128" => "SpacetimeDB.BSATN.I128Stdb",
                "SpacetimeDB.U128" => "SpacetimeDB.BSATN.U128Stdb",
                "SpacetimeDB.I256" => "SpacetimeDB.BSATN.I256",
                "SpacetimeDB.U256" => "SpacetimeDB.BSATN.U256",
                "System.Collections.Generic.List<T>" => $"SpacetimeDB.BSATN.List",
                "System.Collections.Generic.IEnumerable<T>" => $"SpacetimeDB.BSATN.List",
                // If we're here, then this is nullable *value* type like `int?`.
                "System.Nullable<T>" => $"SpacetimeDB.BSATN.ValueOption",

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at crates/bindings-csharp/BSATN.Codegen/Utils.cs:162 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of clockworklabs/SpacetimeDB@524b4487d9 (2026-08-16). Data as JSON: /api/errors/8bc02cc46ef77257. Report an issue: GitHub.