feat(@schematics/angular): add CLI 7.x migration schematic

Author: clydin

packages/schematics/angular/migrations/migration-collection.json

@@ -4,6 +4,11 @@
       "version": "6.0.0-beta.8",
       "factory": "./update-6",
       "description": "Update an Angular CLI project to version 6."
+    },
+    "migration-02": {
+      "version": "7.0.0-beta.0",
+      "factory": "./update-7",
+      "description": "Update an Angular CLI project to version 7."
     }
   }
 }

packages/schematics/angular/migrations/update-7/index.ts

@@ -0,0 +1,31 @@
+/**
+ * @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 { Rule } from '@angular-devkit/schematics';
+import { NodePackageInstallTask } from '@angular-devkit/schematics/tasks';
+import {
+  NodeDependencyType,
+  addPackageJsonDependency,
+} from '../../utility/dependencies';
+import { latestVersions } from '../../utility/latest-versions';
+
+
+export default function(): Rule {
+  return (tree, context) => {
+    addPackageJsonDependency(
+      tree,
+      {
+        type: NodeDependencyType.Dev,
+        name: '@angular-devkit/build-angular',
+        version: latestVersions.DevkitBuildAngular,
+        overwrite: true,
+      },
+    );
+
+    context.addTask(new NodePackageInstallTask());
+  };
+}