Add sample for onCallGenkit

Node/quickstarts/genkit-helloworld/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

Node/quickstarts/genkit-helloworld/README.md

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+Genkit quickstart
+================================================
+
+This quickstart demonstrates how to initialize a [Genkit flow](https://firebase.google.com/docs/genkit/flows) and serve it with Cloud Functions for Firebase.
+
+[Read more about Cloud Functions for Firebase](https://firebase.google.com/docs/functions/)
+
+
+Getting Started
+---------------
+
+1. Install dependencies with `npm install`
+1. Start the functions emulator with `firebase emulators:start --only functions`
+    1. The emulator will output the function URL. It is usually of the form:
+
+    ```
+    https://127.0.0.1:5001/{$PROJECT}/us-central1/tellJoke
+    ```
+
+1. Call the function from a terminal, replacing the `url` argument with your function's URL:
+
+    ```bash
+    $ curl -X POST \
+        --url https://127.0.0.1:5001/{$PROJECT}/us-central1/tellJoke \
+        --header "Content-Type: application/json" \
+        --header "Accept: text/event-stream" \
+        --data '{"data": "Observational comedy"}'
+    ```
+
+License
+-------
+
+© Google, 2025. Licensed under an [Apache-2](../../../LICENSE) license.

Node/quickstarts/genkit-helloworld/firebase.json

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+{
+  "functions": {
+    "codebase": "oncallgenkit-helloworld",
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint"
+    ]
+  }
+}

Node/quickstarts/genkit-helloworld/functions/.eslintrc.js

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+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+module.exports = {
+  root: true,
+  env: {
+    es2020: true,
+    node: true,
+  },
+  extends: [
+    "eslint:recommended",
+    "google",
+  ],
+  rules: {
+    quotes: ["error", "double"],
+  },
+};

Node/quickstarts/genkit-helloworld/functions/.gitignore

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+node_modules/

Node/quickstarts/genkit-helloworld/functions/index.js

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+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START complete-example]
+// [START imports]
+// [START import-trigger]
+const {onCallGenkit} = require("firebase-functions/v2/https");
+// [END import-trigger]
+// [START import-params]
+const {defineSecret} = require("firebase-functions/params");
+// [END import-params]
+
+// [START import-genkit]
+// Dependencies for Genkit.
+const {gemini15Flash, googleAI} = require("@genkit-ai/googleai");
+const {genkit, z} = require("genkit");
+// [END import-genkit]
+// [END imports]
+
+// [START define-secret]
+// Store the Gemini API key in Cloud Secret Manager.
+const apiKey = defineSecret("GOOGLE_GENAI_API_KEY");
+// [END define-secret]
+
+// [START flow]
+const ai = genkit({
+  plugins: [googleAI()],
+  model: gemini15Flash,
+});
+
+const jokeTeller = ai.defineFlow({
+  name: "jokeTeller",
+  inputSchema: z.string().nullable(),
+  outputSchema: z.string(),
+  streamSchema: z.string(),
+}, async (jokeType = "knock-knock", response) => {
+  const prompt = `Tell me a ${jokeType} joke.`;
+
+  // Call the `generateStream()` method to
+  // receive the `stream` async iterable.
+  const {stream, response: aiResponse} = ai.generateStream(prompt);
+
+  // Send new words of the generative AI response
+  // to the client as they're generated.
+  for await (const chunk of stream) {
+    response.sendChunk(chunk.text);
+  }
+
+  // Return the full generative AI response
+  // to clients that may not support streaming.
+  return (await aiResponse).text;
+},
+);
+// [END flow]
+
+// [START trigger]
+exports.tellJoke = onCallGenkit({
+  // [START bind-secrets]
+  // Bind the Gemini API key secret parameter to the function.
+  secrets: [apiKey],
+  // [END bind-secrets]
+  // [START auth-policy]
+  // Protect your endpoint with authPolicy.
+  // authPolicy: (auth) => !!auth?.token.email_verified,
+  // [END auth-policy]
+},
+// Pass in the genkit flow.
+jokeTeller,
+);
+// [END trigger]
+// [END complete-example]

Node/quickstarts/genkit-helloworld/functions/package.json

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+{
+  "name": "functions",
+  "description": "Cloud Functions for Firebase",
+  "scripts": {
+    "lint": "eslint .",
+    "lintfix": "eslint . --fix",
+    "serve": "firebase emulators:start --only functions",
+    "shell": "firebase functions:shell",
+    "start": "npm run shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log",
+    "compile": "cp ../../../../tsconfig.template.json ./tsconfig-compile.json && tsc --project tsconfig-compile.json"
+  },
+  "engines": {
+    "node": "22"
+  },
+  "main": "index.js",
+  "dependencies": {
+    "@genkit-ai/googleai": "1.0.0-rc.12",
+    "firebase-admin": "^13.0.2",
+    "firebase-functions": "^6.3.0",
+    "genkit": "1.0.0-rc.12"
+  },
+  "devDependencies": {
+    "eslint": "^8.57.1",
+    "eslint-config-google": "^0.14.0",
+    "firebase-functions-test": "^3.4.0"
+  },
+  "private": true
+}