feat(genai): Add GenAI SDK samples (1)

Author: gericdong

genai/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "nodejs-genai-samples",
+  "private": true,
+  "license": "Apache-2.0",
+  "author": "Google LLC",
+  "engines": {
+    "node": ">=16.0.0"
+  },
+  "files": [
+    "*.js"
+  ],
+  "scripts": {
+    "test": "c8 mocha -p -j 2 --timeout 2400000 test/*.test.js test/**/*.test.js"
+  },
+  "dependencies": {
+    "@google/genai": "^0.13.0",
+    "axios": "^1.6.2",
+    "supertest": "^7.0.0"
+  },
+  "devDependencies": {
+    "c8": "^10.0.0",
+    "chai": "^4.5.0",
+    "mocha": "^10.0.0",
+    "sinon": "^18.0.0",
+    "uuid": "^10.0.0"
+  }
+}

genai/test/textgen-with-txt.test.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.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+
+const projectId = process.env.CAIP_PROJECT_ID;
+const sample = require('../text-generation/textgen-with-txt.js');
+
+describe('textgen-with-txt', async () => {
+  it('should generate text content from a text prompt', async () => {
+    const output = await sample.generateContent(projectId);
+    assert(output.length > 0);
+  });
+});

genai/text-generation/textgen-with-txt.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.
+
+'use strict';
+
+// [START googlegenaisdk_textgen_with_txt]
+const {GoogleGenAI} = require('@google/genai');
+
+async function generateContent(
+  projectId = process.env.GOOGLE_CLOUD_PROJECT,
+  location = process.env.GOOGLE_CLOUD_LOCATION || 'global'
+) {
+  const ai = new GoogleGenAI({
+    vertexai: true,
+    project: projectId,
+    location: location,
+  });
+
+  const response = await ai.models.generateContent({
+    model: 'gemini-2.0-flash',
+    contents: 'How does AI work?',
+  });
+
+  return response.text;
+}
+// [END googlegenaisdk_textgen_with_txt]
+
+module.exports = {
+  generateContent,
+};