diff --git a/bindings/typescript/src/converters.ts b/bindings/typescript/src/converters.ts
index b9086c93..5b7bfec3 100644
--- a/bindings/typescript/src/converters.ts
+++ b/bindings/typescript/src/converters.ts
@@ -52,35 +52,6 @@ export class ConversionError extends Error {
 // Generic converter factory
 // ============================================================================
 
-/**
- * Convert Map objects to plain objects recursively.
- * This is needed because serde-wasm-bindgen serializes serde_json::Map to JS Map
- * instead of plain objects.
- */
-function convertMapsToObjects(value: unknown): unknown {
-  if (value instanceof Map) {
-    const obj: Record<string, unknown> = {};
-    for (const [key, val] of value.entries()) {
-      obj[key] = convertMapsToObjects(val);
-    }
-    return obj;
-  }
-
-  if (Array.isArray(value)) {
-    return value.map((item) => convertMapsToObjects(item));
-  }
-
-  if (value !== null && typeof value === "object") {
-    const obj: Record<string, unknown> = {};
-    for (const [key, val] of Object.entries(value)) {
-      obj[key] = convertMapsToObjects(val);
-    }
-    return obj;
-  }
-
-  return value;
-}
-
 /**
  * Creates a converter function that transforms provider format to Lingua
  * @param wasmFn - The WASM function to call
@@ -93,9 +64,7 @@ function createToLinguaConverter<TOutput extends Message | Message[]>(
 ): (input: unknown) => TOutput {
   return (input: unknown): TOutput => {
     try {
-      const result = wasmFn()(input);
-      // Convert any Map objects to plain objects
-      return convertMapsToObjects(result) as TOutput;
+      return wasmFn()(input) as TOutput;
     } catch (error: unknown) {
       throw new ConversionError(
         `Failed to convert ${provider} message to Lingua`,
@@ -119,9 +88,7 @@ function createFromLinguaConverter<TInput extends Message | Message[], TOutput>(
 ): <T = TOutput>(input: TInput) => T {
   return <T = TOutput>(input: TInput): T => {
     try {
-      const result = wasmFn()(input);
-      // Convert any Map objects to plain objects
-      return convertMapsToObjects(result) as T;
+      return wasmFn()(input) as T;
     } catch (error: unknown) {
       throw new ConversionError(
         `Failed to convert Lingua to ${provider} format`,
@@ -338,9 +305,7 @@ export const linguaToGoogleContents = createFromLinguaConverter<
  */
 export function deduplicateMessages(messages: Message[]): Message[] {
   try {
-    const result = getWasm().deduplicate_messages(messages);
-    // Convert any Map objects to plain objects
-    return convertMapsToObjects(result) as Message[];
+    return getWasm().deduplicate_messages(messages) as Message[];
   } catch (error: unknown) {
     throw new ConversionError(
       "Failed to deduplicate messages",
@@ -369,9 +334,7 @@ export function importMessagesFromSpans(
   spans: ImportSpan[]
 ): Message[] {
   try {
-    const result = getWasm().import_messages_from_spans(spans);
-    // Convert any Map objects to plain objects
-    return convertMapsToObjects(result) as Message[];
+    return getWasm().import_messages_from_spans(spans) as Message[];
   } catch (error: unknown) {
     throw new ConversionError(
       "Failed to import messages from spans",
@@ -396,9 +359,7 @@ export function importAndDeduplicateMessages(
   spans: ImportSpan[]
 ): Message[] {
   try {
-    const result = getWasm().import_and_deduplicate_messages(spans);
-    // Convert any Map objects to plain objects
-    return convertMapsToObjects(result) as Message[];
+    return getWasm().import_and_deduplicate_messages(spans) as Message[];
   } catch (error: unknown) {
     throw new ConversionError(
       "Failed to import and deduplicate messages from spans",
diff --git a/bindings/typescript/tests/node-exports.test.ts b/bindings/typescript/tests/node-exports.test.ts
index ae63879f..6c76c0f6 100644
--- a/bindings/typescript/tests/node-exports.test.ts
+++ b/bindings/typescript/tests/node-exports.test.ts
@@ -179,6 +179,27 @@ describe("Node.js exports", () => {
     expect(value).toBe(9007199254740993n);
   });
 
+  test("should deduplicate messages across spans and return plain-object results", async () => {
+    const { importAndDeduplicateMessages } = await import("../src/index");
+
+    const sharedTurn = [
+      { role: "user", content: "what is 2+2?" },
+      { role: "assistant", content: "4" },
+    ];
+
+    const messages = importAndDeduplicateMessages([
+      { input: sharedTurn },
+      { input: sharedTurn, output: { role: "assistant", content: "4" } },
+      { input: [{ role: "user", content: "and 3+3?" }] },
+    ]);
+
+    expect(messages).toEqual([
+      { role: "user", content: "what is 2+2?" },
+      { role: "assistant", id: null, content: "4" },
+      { role: "user", content: "and 3+3?" },
+    ]);
+  });
+
   test("should NOT export browser-specific init function", async () => {
     const exports = await import("../src/index");
 
diff --git a/crates/lingua/src/processing/import.rs b/crates/lingua/src/processing/import.rs
index 0921e85a..92330596 100644
--- a/crates/lingua/src/processing/import.rs
+++ b/crates/lingua/src/processing/import.rs
@@ -606,17 +606,19 @@ fn try_choices_array_parsing(data: &Value) -> Option<Vec<Message>> {
 pub fn import_messages_from_spans(spans: Vec<Span>) -> Vec<Message> {
     let mut messages = Vec::new();
 
-    for span in spans {
+    for mut span in spans {
         let mut span_messages = Vec::new();
 
-        // Try to extract messages from input
-        if let Some(Value::String(input_text)) = &span.input {
-            span_messages.push(Message::User {
-                content: UserContent::String(input_text.clone()),
-            });
-        } else if let Some(input) = &span.input {
-            let input_messages = try_converting_to_messages(input);
-            span_messages.extend(input_messages);
+        match span.input.take() {
+            Some(Value::String(input_text)) => {
+                span_messages.push(Message::User {
+                    content: UserContent::String(input_text),
+                });
+            }
+            Some(input) => {
+                span_messages.extend(try_converting_to_messages(&input));
+            }
+            None => {}
         }
 
         #[cfg(feature = "openai")]
@@ -633,17 +635,17 @@ pub fn import_messages_from_spans(spans: Vec<Span>) -> Vec<Message> {
 
         messages.extend(span_messages);
 
-        // Try to extract messages from output
-        if let Some(Value::String(output_text)) = &span.output {
-            if !output_text.is_empty() {
+        match span.output.take() {
+            Some(Value::String(output_text)) if !output_text.is_empty() => {
                 messages.push(Message::Assistant {
-                    content: AssistantContent::String(output_text.clone()),
+                    content: AssistantContent::String(output_text),
                     id: None,
                 });
             }
-        } else if let Some(output) = &span.output {
-            let output_messages = try_converting_to_messages(output);
-            messages.extend(output_messages);
+            Some(output) => {
+                messages.extend(try_converting_to_messages(&output));
+            }
+            None => {}
         }
     }