Fixes issue where generated Google Protobuf messages imported from betterproto.lib instead of using local forward references

betterproto/compile/importing.py

@@ -42,10 +42,8 @@ def get_ref_type(
     Return a Python type name for a proto type reference. Adds the import if
     necessary. Unwraps well known type if required.
     """
-    is_wrapper = source_type in WRAPPER_TYPES
-
     if unwrap:
-        if is_wrapper:
+        if source_type in WRAPPER_TYPES:
             wrapped_type = type(WRAPPER_TYPES[source_type]().value)
             return f"Optional[{wrapped_type.__name__}]"
 
@@ -57,18 +55,18 @@ def get_ref_type(
 
     source_package, source_type = parse_source_type_name(source_type)
 
-    # Use precompiled classes for google.protobuf.* objects
-    if source_package == "google.protobuf":
-        string_import = f"betterproto.lib.{source_package}"
-        py_type = source_type
-        string_alias = safe_snake_case(string_import)
-        imports.add(f"import {string_import} as {string_alias}")
-        return f"{string_alias}.{py_type}"
-
     current_package: List[str] = package.split(".") if package else []
     py_package: List[str] = source_package.split(".") if source_package else []
     py_type: str = pythonize_class_name(source_type)
 
+    compiling_google_protobuf = current_package == ["google", "protobuf"]
+    importing_google_protobuf = py_package == ["google", "protobuf"]
+    if importing_google_protobuf and not compiling_google_protobuf:
+        py_package = ["betterproto", "lib"] + py_package
+
+    if py_package[:1] == ["betterproto"]:
+        return import_root(imports, py_package, py_type)
+
     if py_package == current_package:
         return import_sibling(py_type)
 
@@ -81,6 +79,13 @@ def get_ref_type(
     return import_cousin(current_package, imports, py_package, py_type)
 
 
+def import_root(imports, py_package, py_type):
+    string_import = ".".join(py_package)
+    string_alias = safe_snake_case(string_import)
+    imports.add(f"import {string_import} as {string_alias}")
+    return f"{string_alias}.{py_type}"
+
+
 def import_sibling(py_type):
     """
     package =