Add initial React Renderer v0.9

.github/workflows/react_renderer.yml

@@ -58,6 +58,36 @@ jobs:
       - name: Test React renderer
         working-directory: ./renderers/react
         run: npm test
+
+  build-and-test-demo:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '20'
+
+      - name: Build web_core dependency
+        working-directory: ./renderers/web_core
+        run: |
+          npm ci
+          npm run build
+
+      - name: Install React renderer deps
+        working-directory: ./renderers/react
+        run: npm ci
+
+      - name: Build React Demo
+        working-directory: ./renderers/react
+        run: npm run build:demo
+
+      - name: Test React Demo
+        working-directory: ./renderers/react
+        run: npm run test:demo
+
   lint:
     runs-on: ubuntu-latest
 

renderers/react/a2ui_explorer/README.md

@@ -0,0 +1,62 @@
+# A2UI React Gallery App
+
+This is the reference Gallery Application for the A2UI React renderer. It allows you to explore A2UI samples, inspect the live data model, and step through the message rendering process.
+
+## Prerequisites
+
+This application depends on the following local libraries in this repository:
+1. `@a2ui/web_core` (located in `renderers/web_core`)
+2. `@a2ui/react` (located in `renderers/react`)
+
+## Building Dependencies
+
+Before running the gallery app, you must build the local renderer library:
+
+```bash
+# Navigate to the React renderer library
+cd ../..
+
+# Install and build the library
+npm install
+npm run build
+```
+
+*Note: Ensure `@a2ui/web_core` is also built if you have made changes to the core logic.*
+
+## Setup and Development
+
+Once the dependencies are built, you can start the gallery app:
+
+```bash
+# Navigate to this directory
+cd renderers/react/a2ui_explorer
+
+# Install dependencies
+npm install
+
+# Start the development server
+npm run dev
+```
+
+## Building for Production
+
+To create a production build of the gallery app:
+
+```bash
+npm run build
+```
+
+## Running Tests
+
+To run the integration tests:
+
+```bash
+npm test
+```
+
+## Gallery Features
+
+- **3-Column Layout**: Left (Sample selection), Center (Live preview & Message stepper), Right (Data model & Action logs).
+- **Progressive Stepper**: Use the "Advance" buttons next to each JSON message to see how the UI builds up incrementally.
+- **Action Logs**: View real-time logs of actions triggered by user interactions.
+- **Data Model Inspector**: Observe how the surface's data model changes as you interact with form fields.

renderers/react/a2ui_explorer/eslint.config.js

@@ -0,0 +1,105 @@
+/**
+ * Copyright 2026 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.
+ */
+
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import reactHooksPlugin from 'eslint-plugin-react-hooks';
+import reactRefreshPlugin from 'eslint-plugin-react-refresh';
+import prettierConfig from 'eslint-config-prettier';
+import gts from 'gts';
+
+export default tseslint.config(
+  // Google TypeScript style guide plugin.
+  ...gts.map(config => ({
+    ...config,
+    // Override the project for a2ui_explorer since it has its own tsconfig
+    ...(config.languageOptions?.parserOptions?.project ? {
+      languageOptions: {
+        ...config.languageOptions,
+        parserOptions: {
+          ...config.languageOptions.parserOptions,
+          project: ['./tsconfig.app.json', './tsconfig.node.json']
+        }
+      }
+    } : {})
+  })),
+
+  {
+    files: ['**/*.{ts,tsx}'],
+    plugins: {
+      'react-hooks': reactHooksPlugin,
+      'react-refresh': reactRefreshPlugin,
+    },
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: {
+        ...globals.browser,
+      },
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+    },
+    rules: {
+      // React Hooks rules (errors)
+      ...reactHooksPlugin.configs.recommended.rules,
+
+      // React Refresh rules
+      'react-refresh/only-export-components': [
+        'warn',
+        { allowConstantExport: true },
+      ],
+
+      // TypeScript rules
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+        },
+      ],
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/consistent-type-imports': [
+        'warn',
+        {
+          prefer: 'type-imports',
+          fixStyle: 'inline-type-imports',
+        },
+      ],
+
+      // General rules
+      'no-console': ['warn', { allow: ['warn', 'error'] }],
+      'prefer-arrow-callback': 'off',
+    },
+  },
+
+  // Test files - relaxed rules
+  {
+    files: ['tests/**/*.{ts,tsx}', '**/*.test.{ts,tsx}', 'src/setupTests.ts'],
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      'no-console': 'off',
+    },
+  },
+
+  // Prettier config
+  prettierConfig,
+
+  {
+    ignores: ['dist/**', 'node_modules/**', '**/*.d.ts'],
+  }
+);

renderers/react/a2ui_explorer/index.html

@@ -0,0 +1,30 @@
+<!--
+ Copyright 2026 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.
+-->
+
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200" />
+    <title>react</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

renderers/react/a2ui_explorer/src/App.css

@@ -0,0 +1,58 @@
+/**
+ * Copyright 2026 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.
+ */
+
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .logo.react {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}