9955 dart-dio-next only remove typed_data import if safe (#9956)

Author: MichaelMarner

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java

@@ -322,6 +322,18 @@ public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> o
                 }
             }
 
+            // the MultipartFile handling above changes the type of some parameters from
+            // `UInt8List`, the default for files, to `MultipartFile`.
+            //
+            // The following block removes the required import for Uint8List if it is no
+            // longer in use.
+            if (op.allParams.stream().noneMatch(param -> param.dataType.equals("Uint8List"))
+                    && op.responses.stream().filter(response -> response.dataType != null)
+                            .noneMatch(response -> response.dataType.equals("Uint8List"))) {
+                // Remove unused imports after processing
+                op.imports.remove("Uint8List");
+            }
+
             for (CodegenParameter param : op.bodyParams) {
                 if (param.isContainer) {
                     final Map<String, Object> serializer = new HashMap<>();
@@ -333,11 +345,6 @@ public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> o
                 }
             }
 
-            if (op.allParams.stream().noneMatch(param -> param.dataType.equals("Uint8List"))) {
-                // Remove unused imports after processing
-                op.imports.remove("Uint8List");
-            }
-
             resultImports.addAll(rewriteImports(op.imports, false));
             if (op.getHasFormParams() || op.getHasQueryParams()) {
                 resultImports.add("package:" + pubName + "/src/api_util.dart");