feat(@schematics/angular): remove ivy-ngcc postinstall script from new application

Author: Alan Agius

packages/schematics/angular/application/index.ts

@@ -175,40 +175,6 @@ function mergeWithRootTsLint(parentHost: Tree) {
   };
 }
 
-function addPostInstallScript() {
-  return (host: Tree) => {
-    const pkgJsonPath = '/package.json';
-    const buffer = host.read(pkgJsonPath);
-    if (!buffer) {
-      throw new SchematicsException('Could not read package.json.');
-    }
-
-    const packageJsonAst = parseJsonAst(buffer.toString(), JsonParseMode.Strict);
-    if (packageJsonAst.kind !== 'object') {
-      throw new SchematicsException('Invalid package.json. Was expecting an object.');
-    }
-
-    const scriptsNode = findPropertyInAstObject(packageJsonAst, 'scripts');
-    if (scriptsNode && scriptsNode.kind === 'object') {
-      const recorder = host.beginUpdate(pkgJsonPath);
-      const postInstall = findPropertyInAstObject(scriptsNode, 'postinstall');
-
-      if (!postInstall) {
-        // postinstall script not found, add it.
-        insertPropertyInAstObjectInOrder(
-          recorder,
-          scriptsNode,
-          'postinstall',
-          'ivy-ngcc',
-          4,
-        );
-      }
-
-      host.commitUpdate(recorder);
-    }
-  };
-}
-
 function addAppToWorkspaceFile(options: ApplicationOptions, workspace: WorkspaceSchema): Rule {
   // TODO: use JsonAST
   // const workspacePath = '/angular.json';
@@ -453,7 +419,6 @@ export default function (options: ApplicationOptions): Rule {
           move(sourceDir),
         ]), MergeStrategy.Overwrite),
       options.minimal ? noop() : schematic('e2e', e2eOptions),
-      options.enableIvy ? addPostInstallScript() : noop(),
       options.skipPackageJson ? noop() : addDependenciesToPackageJson(options),
       options.lintFix ? applyLintFix(appDir) : noop(),
     ]);

packages/schematics/angular/application/index_spec.ts

@@ -217,12 +217,6 @@ describe('Application Schematic', () => {
       expect(pkg.devDependencies['typescript']).toEqual(latestVersions.TypeScript);
     });
 
-    it(`should add a postinstall in package.json when 'enableIvy'`, () => {
-      const tree = schematicRunner.runSchematic('application', { ...defaultOptions, enableIvy: true }, workspaceTree);
-      const pkg = JSON.parse(tree.readContent('/package.json'));
-      expect(pkg.scripts.postinstall).toEqual('ivy-ngcc');
-    });
-
     it(`should not override existing users dependencies`, () => {
       const oldPackageJson = workspaceTree.readContent('package.json');
       workspaceTree.overwrite('package.json', oldPackageJson.replace(