fix: update basic-gemini app for compatibility and documentation

js/testapps/basic-gemini/README.md

@@ -0,0 +1,100 @@
+
+# Basic Gemini Project
+
+This project demonstrates the integration of Genkit with GoogleAI and VertexAI to generate dynamic content through flows and tools. The specific focus is a simple app that generates a joke based on a user-provided subject.
+
+## Features
+
+- Uses `genkit` to define and run flows.
+- Integrates `GoogleAI` and `VertexAI` plugins for enhanced AI capabilities.
+- Demonstrates `jokeSubjectGenerator` as a tool and `jokeFlow` as a flow.
+
+## Setup
+
+### Prerequisites
+
+- **Node.js** v20 or later
+- **pnpm** package manager
+- **Google Cloud SDK** installed and initialized
+
+### Environment Variables
+
+Ensure the following environment variables are set:
+
+- **`GOOGLE_APPLICATION_CREDENTIALS`**: Path to the service account key JSON file.
+- **`GOOGLE_PROJECT_ID`**: Your Google Cloud project ID.
+- **`GOOGLE_API_KEY`**: Your API key for GoogleAI.
+
+To set these variables, run:
+
+```bash
+export GOOGLE_APPLICATION_CREDENTIALS="/path/to/service-account.json"
+export GOOGLE_PROJECT_ID="your-google-project-id"
+export GOOGLE_API_KEY="your-google-api-key"
+```
+
+### Google Cloud Initialization
+
+1. Authenticate and set up your project:
+   ```bash
+   gcloud auth login
+   gcloud config set project [YOUR_PROJECT_ID]
+   ```
+2. Ensure the necessary roles are assigned to your service account:
+   - Vertex AI User
+   - Storage Object Viewer
+
+### Install Dependencies
+
+Run the following command in the project root:
+
+```bash
+pnpm install
+```
+
+## Running the Project
+
+The project requires running two terminals:
+
+1. **Terminal 1**: Start the development server with hot-reloading:
+   ```bash
+   pnpm genkit:dev
+   ```
+
+2. **Terminal 2**: You can either:
+   - Run the flow directly:
+     ```bash
+     genkit flow:run jokeFlow
+     ```
+   - Start the Genkit UI for visual execution:
+     ```bash
+     genkit ui:start
+     ```
+
+## Logic and Purpose
+
+This app serves as a demonstration of Genkit's capability to define tools and flows with integrated AI models. The `jokeFlow` takes a user input via the `jokeSubjectGenerator` tool and uses `gemini15Flash` to produce a joke.
+
+### Code Overview
+
+#### `jokeSubjectGenerator`
+
+- **Purpose**: Generates a joke subject, either provided by the user or defaults to "banana".
+- **Input**: `string` (e.g., "apple").
+- **Output**: `string` (same as input).
+
+#### `jokeFlow`
+
+- **Purpose**: Uses `jokeSubjectGenerator` and AI to generate a joke.
+- **Input**: User provides a subject through the UI.
+- **Output**: A joke about the subject.
+
+### Example
+
+- **Input**: "cat"
+- **Output**: "Why did the cat sit on the computer? Because it wanted to keep an eye on the mouse!"
+
+## Notes
+
+- Adjust the temperature in the `config` for creativity levels.
+- Ensure all environment variables are correctly set for smooth execution.

js/testapps/basic-gemini/package.json

@@ -7,20 +7,23 @@
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "node lib/index.js",
     "build": "tsc",
-    "build:watch": "tsc --watch"
+    "build:watch": "tsc --watch",
+    "genkit:dev": "cross-env GENKIT_ENV=dev pnpm dev",
+    "dev": "tsx --watch src/index.ts"
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "genkit": "workspace:*",
     "@genkit-ai/firebase": "workspace:*",
     "@genkit-ai/google-cloud": "workspace:*",
     "@genkit-ai/googleai": "workspace:*",
     "@genkit-ai/vertexai": "workspace:*",
-    "express": "^4.20.0"
+    "express": "^4.20.0",
+    "genkit": "workspace:*"
   },
   "devDependencies": {
+    "cross-env": "^7.0.3",
     "typescript": "^5.6.2"
   }
 }

js/testapps/basic-gemini/src/index.ts

@@ -14,42 +14,77 @@
  * limitations under the License.
  */
 
-import { gemini15Flash, googleAI } from '@genkit-ai/googleai';
-import { vertexAI } from '@genkit-ai/vertexai';
+import { googleAI } from '@genkit-ai/googleai';
+import { gemini15Flash, vertexAI } from '@genkit-ai/vertexai';
 import { genkit, z } from 'genkit';
 
+// Initialize Genkit with GoogleAI and VertexAI plugins
 const ai = genkit({
   plugins: [googleAI(), vertexAI()],
 });
+console.log('Genkit initialized:', ai);
 
+/**
+ * @tool jokeSubjectGenerator
+ * A tool to generate a subject for a joke based on input or return a default value.
+ *
+ * @param {string} subject - The initial subject or fallback.
+ * @returns {string} The joke subject.
+ * 
+ * @example
+ * Input: "apple"
+ * Output: "apple"
+ */
 const jokeSubjectGenerator = ai.defineTool(
   {
     name: 'jokeSubjectGenerator',
-    description: 'Can be called to generate a subject for a joke',
+    description: 'Generates a subject for a joke based on input',
   },
-  async () => {
-    return 'banana';
+  async (subject: string = 'banana') => {
+    return subject;
   }
 );
 
+/**
+ * @flow jokeFlow
+ * A flow to generate a joke subject using a Large Language Model.
+ *
+ * @flowDescription
+ * This flow leverages the `jokeSubjectGenerator` tool to provide a subject 
+ * and constructs a joke using the `gemini15Flash` model from VertexAI.
+ *
+ * @returns {Promise<string>} Generated joke subject as a string.
+ *
+ * @example
+ * Input: { jokeSubject: "apple" }
+ * Output: "Generated joke about: apple"
+ */
 export const jokeFlow = ai.defineFlow(
   {
     name: 'jokeFlow',
-    inputSchema: z.void(),
-    outputSchema: z.any(),
+    inputSchema: z.object({
+      jokeSubject: z.string().optional().default('banana'), // Accepts input from the UI
+    }),
+    outputSchema: z.string(), // Outputs a string
   },
-  async () => {
+  async (input) => {
+    console.log('Flow execution started');
+
+    // Use the provided joke subject or fallback to default
+    const jokeSubject = await jokeSubjectGenerator(input.jokeSubject);
+    console.log('Generated joke subject:', jokeSubject);
+
+    // Generate response using the LLM model
     const llmResponse = await ai.generate({
       model: gemini15Flash,
       config: {
-        temperature: 2,
-      },
-      output: {
-        schema: z.object({ jokeSubject: z.string() }),
+        temperature: 2, // Adjust model temperature to control creativity
       },
-      tools: [jokeSubjectGenerator],
-      prompt: `come up with a subject to joke about (using the function provided)`,
+      tools: [jokeSubjectGenerator], // Tool used in the flow
+      prompt: `Generate a joke about the following subject: ${jokeSubject}`,
     });
-    return llmResponse.output;
+
+    console.log('LLM Response:', llmResponse.text); // Logs the response text from the model
+    return llmResponse.text;
   }
 );