fix(js/prompts): fixed .prompt input handling on prompt render

js/genkit/src/genkit.ts

@@ -263,11 +263,10 @@ export class Genkit implements HasRegistry {
     }) as ExecutablePrompt<z.infer<I>, O, CustomOptions>;
 
     executablePrompt.render = async (
-      opt: PromptGenerateOptions<O, CustomOptions> & {
-        input?: I;
-      }
+      input?: I,
+      opts?: PromptGenerateOptions<O, CustomOptions>
     ): Promise<GenerateOptions<O, CustomOptions>> => {
-      return (await promise).render(opt.input, opt) as Promise<
+      return (await promise).render(input, opts) as Promise<
         GenerateOptions<O, CustomOptions>
       >;
     };

js/genkit/tests/chat_test.ts

@@ -31,6 +31,7 @@ describe('chat', () => {
   beforeEach(() => {
     ai = genkit({
       model: 'echoModel',
+      promptDir: './tests/prompts',
     });
     defineEchoModel(ai);
   });
@@ -155,6 +156,19 @@ describe('chat', () => {
     );
   });
 
+  it('can start chat from a prompt file with input', async () => {
+    const preamble = ai.prompt('chat_preamble');
+    const session = await ai.chat(preamble, {
+      input: { name: 'Genkit' },
+    });
+    const response = await session.send('send it');
+
+    assert.strictEqual(
+      response.text,
+      'Echo: hi Genkit from template,send it; config: {"version":"abc"}'
+    );
+  });
+
   it('can send a rendered prompt to chat', async () => {
     const prompt = ai.definePrompt({
       name: 'hi',

js/genkit/tests/prompts/chat_preamble.prompt

@@ -0,0 +1,5 @@
+---
+config: 
+  version: 'abc'
+---
+hi {{ name }} from template

js/genkit/tests/prompts_test.ts

@@ -1106,15 +1106,14 @@ describe('prompt', () => {
         {
           content: [
             {
-              text: ' from the prompt file ',
+              text: ' from the prompt file banana',
             },
           ],
           role: 'model',
         },
       ],
       returnToolRequests: true,
       toolChoice: 'required',
-      subject: 'banana',
       tools: ['toolA', 'toolB'],
     });
   });