fix(@schematics/angular): remove bootstrapping wrapping in universal schematic

The bootstrapping wrapping is no longer necessary as of 15.1.3. See: angular/angular#48868

(cherry picked from commit 88fddc0)

Author: alan-agius4

packages/schematics/angular/universal/index.ts

@@ -29,7 +29,7 @@ import {
   getPackageJsonDependency,
 } from '../utility/dependencies';
 import { latestVersions } from '../utility/latest-versions';
-import { findBootstrapModuleCall, findBootstrapModulePath } from '../utility/ng-ast-utils';
+import { findBootstrapModulePath } from '../utility/ng-ast-utils';
 import { relativePathToWorkspaceRoot } from '../utility/paths';
 import { targetBuildNotFoundError } from '../utility/project-targets';
 import { getWorkspace, updateWorkspace } from '../utility/workspace';
@@ -109,84 +109,6 @@ function findBrowserModuleImport(host: Tree, modulePath: string): ts.Node {
   return browserModuleNode;
 }
 
-function wrapBootstrapCall(mainFile: string): Rule {
-  return (host: Tree) => {
-    const mainPath = normalize('/' + mainFile);
-    let bootstrapCall: ts.Node | null = findBootstrapModuleCall(host, mainPath);
-    if (bootstrapCall === null) {
-      throw new SchematicsException('Bootstrap module not found.');
-    }
-
-    let bootstrapCallExpression: ts.Node | null = null;
-    let currentCall = bootstrapCall;
-    while (bootstrapCallExpression === null && currentCall.parent) {
-      currentCall = currentCall.parent;
-      if (ts.isExpressionStatement(currentCall) || ts.isVariableStatement(currentCall)) {
-        bootstrapCallExpression = currentCall;
-      }
-    }
-    bootstrapCall = currentCall;
-
-    // In case the bootstrap code is a variable statement
-    // we need to determine it's usage
-    if (bootstrapCallExpression && ts.isVariableStatement(bootstrapCallExpression)) {
-      const declaration = bootstrapCallExpression.declarationList.declarations[0];
-      const bootstrapVar = (declaration.name as ts.Identifier).text;
-      const sf = bootstrapCallExpression.getSourceFile();
-      bootstrapCall = findCallExpressionNode(sf, bootstrapVar) || currentCall;
-    }
-
-    // indent contents
-    const triviaWidth = bootstrapCall.getLeadingTriviaWidth();
-    const beforeText =
-      `function bootstrap() {\n` + ' '.repeat(triviaWidth > 2 ? triviaWidth + 1 : triviaWidth);
-    const afterText =
-      `\n${triviaWidth > 2 ? ' '.repeat(triviaWidth - 1) : ''}};\n` +
-      `
-
- if (document.readyState === 'complete') {
-   bootstrap();
- } else {
-   document.addEventListener('DOMContentLoaded', bootstrap);
- }
- `;
-
-    // in some cases we need to cater for a trailing semicolon such as;
-    // bootstrap().catch(err => console.log(err));
-    const lastToken = bootstrapCall.parent.getLastToken();
-    let endPos = bootstrapCall.getEnd();
-    if (lastToken && lastToken.kind === ts.SyntaxKind.SemicolonToken) {
-      endPos = lastToken.getEnd();
-    }
-
-    const recorder = host.beginUpdate(mainPath);
-    recorder.insertLeft(bootstrapCall.getStart(), beforeText);
-    recorder.insertRight(endPos, afterText);
-    host.commitUpdate(recorder);
-  };
-}
-
-function findCallExpressionNode(node: ts.Node, text: string): ts.Node | null {
-  if (
-    ts.isCallExpression(node) &&
-    ts.isIdentifier(node.expression) &&
-    node.expression.text === text
-  ) {
-    return node;
-  }
-
-  let foundNode: ts.Node | null = null;
-  ts.forEachChild(node, (childNode) => {
-    foundNode = findCallExpressionNode(childNode, text);
-
-    if (foundNode) {
-      return true;
-    }
-  });
-
-  return foundNode;
-}
-
 function addServerTransition(
   options: UniversalOptions,
   mainFile: string,
@@ -292,7 +214,6 @@ export default function (options: UniversalOptions): Rule {
       mergeWith(rootSource),
       addDependencies(),
       updateConfigFile(options, tsConfigDirectory),
-      wrapBootstrapCall(clientBuildOptions.main),
       addServerTransition(options, clientBuildOptions.main, clientProject.root),
     ]);
   };

packages/schematics/angular/universal/index_spec.ts

@@ -191,36 +191,6 @@ describe('Universal Schematic', () => {
     expect(contents).not.toContain(`withServerTransition({ appId: 'foo' })`);
   });
 
-  it('should wrap the bootstrap call in a DOMContentLoaded event handler', async () => {
-    const tree = await schematicRunner.runSchematic('universal', defaultOptions, appTree);
-    const filePath = '/projects/bar/src/main.ts';
-    const contents = tree.readContent(filePath);
-    expect(contents).toContain(`document.addEventListener('DOMContentLoaded', bootstrap);`);
-  });
-
-  it('should wrap the bootstrap declaration in a DOMContentLoaded event handler', async () => {
-    const filePath = '/projects/bar/src/main.ts';
-    appTree.overwrite(
-      filePath,
-      `
-      import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
-      import { AppModule } from './app/app.module';
-      import { environment } from './environments/environment';
-      import { hmrBootstrap } from './hmr';
-
-      const bootstrap = () => platformBrowserDynamic().bootstrapModule(AppModule);
-
-      if (!hmrBootstrap) {
-        bootstrap().catch(err => console.log(err));
-      }
-      `,
-    );
-
-    const tree = await schematicRunner.runSchematic('universal', defaultOptions, appTree);
-    const contents = tree.readContent(filePath);
-    expect(contents).toContain(`document.addEventListener('DOMContentLoaded', bootstrap);`);
-  });
-
   it('should install npm dependencies', async () => {
     await schematicRunner.runSchematic('universal', defaultOptions, appTree);
     expect(schematicRunner.tasks.length).toBe(1);