feat: Add typed stuff

tests/openai.test.ts

@@ -2,8 +2,8 @@
  * Tests for OpenAI Provider
  */
 
-import { describe, it, expect, beforeEach } from 'bun:test';
-import { OpenAIProvider, AIProviderError, AIErrorType } from '../src/index.js';
+import { describe, it, expect, beforeEach, jest } from 'bun:test';
+import { OpenAIProvider, createResponseType, AIProviderError, AIErrorType } from '../src/index.js';
 
 describe('OpenAIProvider', () => {
   let provider: OpenAIProvider;
@@ -201,7 +201,7 @@ describe('OpenAIProvider', () => {
 
     it('should handle messages with metadata', () => {
       const messages = [
-        { 
+        {
           role: 'user' as const, 
           content: 'Hello',
           metadata: { timestamp: '2024-01-01' }
@@ -258,4 +258,32 @@ describe('OpenAIProvider', () => {
       }).toThrow('No content found in OpenAI response');
     });
   });
-}); 
+
+  describe('structured responses', () => {
+    it('should handle structured responses correctly', async () => {
+      const provider = new OpenAIProvider({ apiKey: 'test-key' });
+      const mockResponse = {
+        content: JSON.stringify({ name: 'John Doe', age: 30 }),
+        model: 'gpt-4',
+        usage: { promptTokens: 10, completionTokens: 20, totalTokens: 30 },
+        id: 'test-id'
+      };
+      (provider as any).doComplete = jest.fn().mockResolvedValue(mockResponse);
+      (provider as any).initialized = true;
+
+      const responseType = createResponseType<{ name: string; age: number }>
+        (`{ name: string; age: number }`,
+        'A user profile'
+      );
+
+      const response = await provider.complete<{ name: string; age: number }>({
+        messages: [{ role: 'user', content: 'test' }],
+        responseType
+      });
+
+      expect(response.content).toEqual({ name: 'John Doe', age: 30 });
+      expect(response.rawContent).toBe(JSON.stringify({ name: 'John Doe', age: 30 }));
+      expect((provider as any).doComplete).toHaveBeenCalled();
+    });
+  });
+});