feat(elements): set up the elements package

packages/elements/index.ts

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// This file is not used to build this module. It is only used during editing
+// by the TypeScript language service and during build for verification. `ngc`
+// replaces this file with production index.ts when it rewrites private symbol
+// names.
+
+export * from './public_api';

packages/elements/package.json

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+{
+  "name": "@angular/elements",
+  "version": "0.0.0-PLACEHOLDER",
+  "description": "Angular - library for using Angular in a web browser",
+  "main": "./bundles/elements.umd.js",
+  "module": "./esm5/elements.js",
+  "es2015": "./esm2015/elements.js",
+  "typings": "./elements.d.ts",
+  "author": "angular",
+  "license": "MIT",
+  "dependencies": {
+    "tslib": "^1.7.1"
+  },
+  "peerDependencies": {
+    "@angular/core": "0.0.0-PLACEHOLDER",
+    "@angular/platform-browser": "0.0.0-PLACEHOLDER"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/angular/angular.git"
+  }
+}

packages/elements/public_api.ts

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * @module
+ * @description
+ * Entry point for all public APIs of the `elements` package.
+ */
+export {VERSION} from './src/version';
+
+// This file only reexports content of the `src` folder. Keep it that way.

packages/elements/rollup.config.js

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+const resolve = require('rollup-plugin-node-resolve');
+const sourcemaps = require('rollup-plugin-sourcemaps');
+
+const globals = {
+  '@angular/core': 'ng.core',
+};
+
+module.exports = {
+  entry: '../../dist/packages-dist/elements/esm5/elements.js',
+  dest: '../../dist/packages-dist/elements/bundles/elements.umd.js',
+  format: 'umd',
+  exports: 'named',
+  amd: {id: '@angular/elements'},
+  moduleName: 'ng.elements',
+  plugins: [resolve(), sourcemaps()],
+  external: Object.keys(globals),
+  globals: globals
+};

packages/elements/src/version.ts

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Version} from '@angular/core';
+
+/**
+ * @experimental
+ */
+export const VERSION = new Version('0.0.0-PLACEHOLDER');

packages/elements/tsconfig-build.json

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+{
+  "extends": "../tsconfig-build.json",
+
+  "compilerOptions": {
+    "baseUrl": ".",
+    "rootDir": ".",
+    "paths": {
+      "@angular/common": ["../../dist/packages/common"],
+      "@angular/core": ["../../dist/packages/core"],
+      "@angular/platform-browser": ["../../dist/packages/platform-browser"]
+    },
+    "outDir": "../../dist/packages/elements"
+  },
+
+  "files": [
+    "public_api.ts",
+    "../../node_modules/zone.js/dist/zone.js.d.ts"
+  ],
+
+  "angularCompilerOptions": {
+    "annotateForClosureCompiler": true,
+    "strictMetadataEmit": false,
+    "skipTemplateCodegen": true,
+    "flatModuleOutFile": "elements.js",
+    "flatModuleId": "@angular/elements"
+  }
+}