feat: adds support for attribute data types

packages/react-native/src/index.ts

@@ -18,12 +18,12 @@ export const setUserId = async (userId: string): Promise<void> => {
   await queue.wait();
 };
 
-export const setAttribute = async (key: string, value: string): Promise<void> => {
+export const setAttribute = async (key: string, value: string | number | Date): Promise<void> => {
   queue.add(Attributes.setAttributes, true, { [key]: value });
   await queue.wait();
 };
 
-export const setAttributes = async (attributes: Record<string, string>): Promise<void> => {
+export const setAttributes = async (attributes: Record<string, string | number | Date>): Promise<void> => {
   queue.add(Attributes.setAttributes, true, attributes);
   await queue.wait();
 };

packages/react-native/src/lib/common/api.ts

@@ -76,21 +76,17 @@ export class ApiClient {
 
   async createOrUpdateUser(userUpdateInput: {
     userId: string;
-    attributes?: Record<string, string>;
+    attributes?: Record<string, string | number>;
   }): Promise<Result<CreateOrUpdateUserResponse, ApiErrorResponse>> {
-    // transform all attributes to string if attributes are present into a new attributes copy
-    const attributes: Record<string, string> = {};
-    for (const key in userUpdateInput.attributes) {
-      attributes[key] = String(userUpdateInput.attributes[key]);
-    }
-
+    // Pass attributes as-is to preserve number types
+    // The backend will use the JS type to determine the attribute data type
     return makeRequest(
       this.appUrl,
       `/api/v2/client/${this.environmentId}/user`,
       "POST",
       {
         userId: userUpdateInput.userId,
-        attributes,
+        attributes: userUpdateInput.attributes,
       },
       this.isDebug
     );

packages/react-native/src/lib/survey/action.ts

@@ -114,7 +114,7 @@ export const track = async (
     if (!actionClass) {
       return err({
         code: "invalid_code",
-        message: `${code} action unknown. Please add this action in Formbricks first in order to use it in your code.`,
+        message: `Action with identifier '${code}' is unknown. Please add this action in Formbricks in order to use it via the SDK action tracking.`,
       });
     }
 

packages/react-native/src/lib/survey/tests/action.test.ts

@@ -185,7 +185,7 @@ describe("survey/action.ts", () => {
       if (!result.ok) {
         expect(result.error.code).toBe("invalid_code");
         expect(result.error.message).toBe(
-          "invalidCode action unknown. Please add this action in Formbricks first in order to use it in your code."
+          "Action with identifier 'invalidCode' is unknown. Please add this action in Formbricks in order to use it via the SDK action tracking."
         );
       }
     });

packages/react-native/src/lib/user/attribute.ts

@@ -1,12 +1,38 @@
 import { UpdateQueue } from "@/lib/user/update-queue";
 import { type NetworkError, type Result, okVoid } from "@/types/error";
 
+/**
+ * Sets attributes on the current user/contact.
+ *
+ * Attribute types are determined by the JavaScript value type:
+ * - String values -> string attribute
+ * - Number values -> number attribute
+ * - Date objects -> date attribute (converted to ISO string)
+ * - ISO 8601 date strings -> date attribute
+ *
+ * On first write to a new attribute, the type is set based on the JS value type.
+ * On subsequent writes, the value must match the existing attribute type.
+ *
+ * @param attributes - Key-value pairs where values can be strings, numbers, or Date objects
+ */
 export const setAttributes = async (
-  attributes: Record<string, string>
+  attributes: Record<string, string | number | Date>
   // eslint-disable-next-line @typescript-eslint/require-await -- we want to use promises here
 ): Promise<Result<void, NetworkError>> => {
+  // Normalize values: convert Date to ISO string, preserve numbers as numbers
+  const normalizedAttributes: Record<string, string | number> = {};
+  for (const [key, value] of Object.entries(attributes)) {
+    if (value instanceof Date) {
+      // Date objects become ISO strings (backend will detect as date type)
+      normalizedAttributes[key] = value.toISOString();
+    } else {
+      // Preserve strings as strings, numbers as numbers
+      normalizedAttributes[key] = value;
+    }
+  }
+
   const updateQueue = UpdateQueue.getInstance();
-  await updateQueue.updateAttributes(attributes);
+  await updateQueue.updateAttributes(normalizedAttributes);
   void updateQueue.processUpdates();
   return okVoid();
 };

packages/react-native/src/lib/user/tests/attribute.test.ts

@@ -80,5 +80,55 @@ describe("User Attributes", () => {
       expect(mockUpdateQueue.processUpdates).toHaveBeenCalled();
       // The function returns before processUpdates completes due to void operator
     });
+
+    test("converts Date values to ISO strings", async () => {
+      const testDate = new Date("2026-01-15T10:30:00.000Z");
+      const attributes = { createdAt: testDate };
+
+      await setAttributes(attributes);
+
+      expect(mockUpdateQueue.updateAttributes).toHaveBeenCalledWith({
+        createdAt: "2026-01-15T10:30:00.000Z",
+      });
+    });
+
+    test("preserves number values as numbers", async () => {
+      const attributes = { age: 25, score: 99.5 };
+
+      await setAttributes(attributes);
+
+      expect(mockUpdateQueue.updateAttributes).toHaveBeenCalledWith({
+        age: 25,
+        score: 99.5,
+      });
+    });
+
+    test("preserves string values as strings", async () => {
+      const attributes = { name: "Alice", role: "admin" };
+
+      await setAttributes(attributes);
+
+      expect(mockUpdateQueue.updateAttributes).toHaveBeenCalledWith({
+        name: "Alice",
+        role: "admin",
+      });
+    });
+
+    test("normalizes mixed attribute types correctly", async () => {
+      const testDate = new Date("2026-06-01T00:00:00.000Z");
+      const attributes = {
+        name: "Bob",
+        age: 30,
+        joinedAt: testDate,
+      };
+
+      await setAttributes(attributes);
+
+      expect(mockUpdateQueue.updateAttributes).toHaveBeenCalledWith({
+        name: "Bob",
+        age: 30,
+        joinedAt: "2026-06-01T00:00:00.000Z",
+      });
+    });
   });
 });

packages/react-native/src/lib/user/tests/update-queue.test.ts

@@ -24,12 +24,16 @@ vi.mock("@/lib/common/config", () => ({
   },
 }));
 
+const { mockLogger } = vi.hoisted(() => ({
+  mockLogger: {
+    debug: vi.fn(),
+    error: vi.fn(),
+  },
+}));
+
 vi.mock("@/lib/common/logger", () => ({
   Logger: {
-    getInstance: vi.fn(() => ({
-      debug: vi.fn(),
-      error: vi.fn(),
-    })),
+    getInstance: vi.fn(() => mockLogger),
   },
 }));
 
@@ -119,6 +123,7 @@ describe("UpdateQueue", () => {
 
     (sendUpdates as Mock).mockReturnValue({
       ok: true,
+      data: { hasWarnings: false },
     });
 
     await updateQueue.updateAttributes({ name: mockAttributes.name });
@@ -162,4 +167,42 @@ describe("UpdateQueue", () => {
       "Formbricks can't set attributes without a userId!"
     );
   });
+
+  test("processUpdates logs error when sendUpdates fails", async () => {
+    (sendUpdates as Mock).mockResolvedValue({
+      ok: false,
+      error: { message: "Server error" },
+    });
+
+    await updateQueue.updateAttributes({ name: mockAttributes.name });
+
+    await new Promise((resolve) => {
+      setTimeout(resolve, 600);
+    });
+
+    await updateQueue.processUpdates();
+
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      "Failed to send updates: Server error"
+    );
+  });
+
+  test("processUpdates suppresses success log when hasWarnings is true", async () => {
+    (sendUpdates as Mock).mockResolvedValue({
+      ok: true,
+      data: { hasWarnings: true },
+    });
+
+    await updateQueue.updateAttributes({ name: mockAttributes.name });
+
+    await new Promise((resolve) => {
+      setTimeout(resolve, 600);
+    });
+
+    await updateQueue.processUpdates();
+
+    expect(mockLogger.debug).not.toHaveBeenCalledWith(
+      "Updates sent successfully"
+    );
+  });
 });

packages/react-native/src/lib/user/tests/update.test.ts

@@ -24,6 +24,7 @@ vi.mock("@/lib/common/logger", () => ({
   Logger: {
     getInstance: vi.fn(() => ({
       debug: vi.fn(),
+      error: vi.fn(),
     })),
   },
 }));
@@ -104,7 +105,7 @@ describe("sendUpdatesToBackend", () => {
     if (!result.ok) {
       expect(result.error.code).toBe("network_error");
       expect(result.error.message).toBe(
-        "Error updating user with userId user_123"
+        "Error updating user with userId user_123",
       );
     }
   });
@@ -128,7 +129,7 @@ describe("sendUpdatesToBackend", () => {
         appUrl: mockAppUrl,
         environmentId: mockEnvironmentId,
         updates: mockUpdates,
-      })
+      }),
     ).rejects.toThrow("Network error");
   });
 });
@@ -150,6 +151,7 @@ describe("sendUpdates", () => {
 
     (Logger.getInstance as Mock).mockImplementation(() => ({
       debug: vi.fn(),
+      error: vi.fn(),
     }));
   });
 
@@ -176,6 +178,9 @@ describe("sendUpdates", () => {
     });
 
     expect(result.ok).toBe(true);
+    if (result.ok) {
+      expect(result.data.hasWarnings).toBe(false);
+    }
   });
 
   test("handles backend errors", async () => {
@@ -204,6 +209,74 @@ describe("sendUpdates", () => {
     }
   });
 
+  test("returns hasWarnings true when backend returns errors", async () => {
+    const mockResponse = {
+      ok: true,
+      data: {
+        state: {
+          data: {
+            userId: mockUserId,
+            attributes: mockAttributes,
+          },
+          expiresAt: new Date(Date.now() + 1000 * 60 * 30),
+        },
+        errors: ["Attribute 'invalidKey' has an invalid key format"],
+      },
+    };
+
+    (ApiClient as Mock).mockImplementation(function () {
+      return { createOrUpdateUser: vi.fn().mockResolvedValue(mockResponse) };
+    });
+
+    const result = await sendUpdates({
+      updates: { userId: mockUserId, attributes: mockAttributes },
+    });
+
+    expect(result.ok).toBe(true);
+    if (result.ok) {
+      expect(result.data.hasWarnings).toBe(true);
+    }
+  });
+
+  test("logs backend errors at error level and messages at debug level", async () => {
+    const mockError = vi.fn();
+    const mockDebug = vi.fn();
+    (Logger.getInstance as Mock).mockImplementation(() => ({
+      debug: mockDebug,
+      error: mockError,
+    }));
+
+    const mockResponse = {
+      ok: true,
+      data: {
+        state: {
+          data: {
+            userId: mockUserId,
+            attributes: mockAttributes,
+          },
+          expiresAt: new Date(Date.now() + 1000 * 60 * 30),
+        },
+        messages: ["Email attribute already exists"],
+        errors: ["Attribute 'badKey' has an invalid format"],
+      },
+    };
+
+    (ApiClient as Mock).mockImplementation(function () {
+      return { createOrUpdateUser: vi.fn().mockResolvedValue(mockResponse) };
+    });
+
+    await sendUpdates({
+      updates: { userId: mockUserId, attributes: mockAttributes },
+    });
+
+    expect(mockError).toHaveBeenCalledWith(
+      "Attribute 'badKey' has an invalid format",
+    );
+    expect(mockDebug).toHaveBeenCalledWith(
+      "User update message: Email attribute already exists",
+    );
+  });
+
   test("handles unexpected errors", async () => {
     (ApiClient as Mock).mockImplementation(function () {
       return {