.

Author: SimonCropp

src/ApiBuilderTests/Splitter.cs

@@ -287,7 +287,7 @@ public static void Run()
                 var lines = ProcessFile(sourceCode, definedSymbols);
                 lines = RemoveEmptyConditionalBlocks(lines);
                 lines = RemoveEmptyLines(lines);
-                if (lines.Count == 0)
+                if (lines.Count == 0 || !ContainsTypes(lines))
                 {
                     continue;
                 }
@@ -304,6 +304,22 @@ public static void Run()
     public static List<string> RemoveEmptyLines(List<string> lines) =>
         lines.Where(l => !string.IsNullOrWhiteSpace(l)).ToList();
 
+    /// <summary>
+    /// Checks if the lines contain any type declarations (class, struct, record, interface, enum, delegate) or TypeForwardedTo attributes.
+    /// </summary>
+    public static bool ContainsTypes(List<string> lines) =>
+        lines.Any(line =>
+        {
+            var trimmed = line.TrimStart();
+            return trimmed.Contains("class ") ||
+                   trimmed.Contains("struct ") ||
+                   trimmed.Contains("record ") ||
+                   trimmed.Contains("interface ") ||
+                   trimmed.Contains("enum ") ||
+                   trimmed.Contains("delegate ") ||
+                   trimmed.Contains("TypeForwardedTo");
+        });
+
     /// <summary>
     /// Removes empty conditional blocks (e.g., #if X followed directly by #endif with no content).
     /// Handles nested cases by repeatedly removing until no more empty blocks exist.