fix(types): default typeMap to empty Map for non-TS native results (#569)

patchNativeResult now initializes typeMap to an empty Map when the
native engine omits it (common for Python, Go, Rust, etc.), ensuring
the returned object satisfies the ExtractorOutput contract and callers
can safely access .entries()/.size without null checks.

Author: carlos-alm

src/domain/parser.ts

@@ -303,8 +303,12 @@ function patchNativeResult(r: any): ExtractorOutput {
     }
   }
 
-  // typeMap: native returns an array of {name, typeName}; normalize to Map
-  if (r.typeMap && !(r.typeMap instanceof Map)) {
+  // typeMap: native returns an array of {name, typeName}; normalize to Map.
+  // Non-TS languages may omit typeMap entirely — default to empty Map so
+  // callers can safely access .entries()/.size without null checks.
+  if (!r.typeMap) {
+    r.typeMap = new Map();
+  } else if (!(r.typeMap instanceof Map)) {
     r.typeMap = new Map(
       r.typeMap.map((e: { name: string; typeName: string }) => [
         e.name,