feat: set up Angular infrastructure for TableWidget (#16934)

Initialized an Angular workspace within
bigframes/display/table_widget_angular and configured a custom build
pipeline using esbuild to generate a single-file ESM output. This
establishes the infrastructure required for the planned Angular hybrid
approach for TableWidget.

Verified at: screen/8uAnJEYQr9nx655

Fixes #<505414691> 🦕

Author: shuoweil

packages/bigframes/bigframes/display/table_widget_angular.js

@@ -0,0 +1,17 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+ij_typescript_use_double_quotes = false
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

packages/bigframes/bigframes/display/table_widget_angular/.editorconfig

@@ -0,0 +1,44 @@
+# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/mcp.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+__screenshots__/
+
+# System files
+.DS_Store
+Thumbs.db

packages/bigframes/bigframes/display/table_widget_angular/.gitignore

@@ -0,0 +1,12 @@
+{
+  "printWidth": 100,
+  "singleQuote": true,
+  "overrides": [
+    {
+      "files": "*.html",
+      "options": {
+        "parser": "angular"
+      }
+    }
+  ]
+}

packages/bigframes/bigframes/display/table_widget_angular/.prettierrc

@@ -0,0 +1,41 @@
+# TableWidgetAngular
+
+This project is the Angular-based interactive Table Widget frontend for BigQuery DataFrames (``bigframes``). It is integrated into the Python backend using ``anywidget``.
+
+## Getting Started
+
+Ensure you have [Node.js](https://nodejs.org/) installed.
+
+1. Install dependencies:
+   ```bash
+   npm install
+   ```
+
+2. Start the local development server:
+   ```bash
+   npm run start
+   ```
+   Navigate to `http://localhost:4200/`. The application will automatically reload when you modify the source files under `src/`.
+
+## Development & Code Scaffolding
+
+This project was generated using [Angular CLI](https://github.com/angular/angular-cli). To generate a new component, directive, or service:
+```bash
+ng generate component component-name
+```
+
+## Running Tests
+
+To execute unit tests:
+```bash
+npm run test
+```
+
+## Packaging for Python
+
+Before testing the widget inside a Jupyter notebook or committing changes, compile the Angular app and bundle it so that the Python backend can load it:
+```bash
+npm run build:widget
+```
+
+This command compiles the project in production mode and then triggers `bundle.js` (via `esbuild`) to bundle the browser artifacts into a single unified ES module file at `../table_widget_angular.js`.

packages/bigframes/bigframes/display/table_widget_angular/README.md

@@ -0,0 +1,73 @@
+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "cli": {
+    "packageManager": "npm"
+  },
+  "newProjectRoot": "projects",
+  "projects": {
+    "table-widget-angular": {
+      "projectType": "application",
+      "schematics": {},
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular/build:application",
+          "options": {
+            "browser": "src/main.ts",
+            "tsConfig": "tsconfig.app.json",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.css"
+            ]
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kB",
+                  "maximumError": "1MB"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "4kB",
+                  "maximumError": "8kB"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular/build:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "table-widget-angular:build:production"
+            },
+            "development": {
+              "buildTarget": "table-widget-angular:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "test": {
+          "builder": "@angular/build:unit-test"
+        }
+      }
+    }
+  }
+}

packages/bigframes/bigframes/display/table_widget_angular/angular.json

@@ -0,0 +1,46 @@
+/*
+ * 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.
+ */
+
+const esbuild = require('esbuild');
+const path = require('path');
+
+const banner = `/*
+ * 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.
+ */
+`;
+
+esbuild.build({
+  entryPoints: [path.resolve(__dirname, 'dist/table-widget-angular/browser/main.js')],
+  bundle: true,
+  outfile: path.resolve(__dirname, '../table_widget_angular.js'),
+  format: 'esm',
+  logLevel: 'info',
+  banner: {
+    js: banner,
+  },
+}).catch(() => process.exit(1));