fix(migrations): add protractor support if protractor imports are det…

…ected (#49274)

The new `bootstrapApplication` API doesn't include Protractor support anymore which may cause existing e2e tests to break after the migration. These changes add some logic that will provide Protractor support if any imports to `protractor` or `protractor/*` are detected.

PR Close #49274

packages/core/schematics/ng-generate/standalone-migration/standalone-bootstrap.ts

@@ -8,7 +8,7 @@
 
 
 import {NgtscProgram} from '@angular/compiler-cli';
-import {Reference, TemplateTypeChecker} from '@angular/compiler-cli/private/migrations';
+import {TemplateTypeChecker} from '@angular/compiler-cli/private/migrations';
 import {dirname, join} from 'path';
 import ts from 'typescript';
 
@@ -45,6 +45,12 @@ export function toStandaloneBootstrap(
   const testObjects = new Set<ts.ObjectLiteralExpression>();
   const allDeclarations = new Set<ts.ClassDeclaration>();
 
+  // `bootstrapApplication` doesn't include Protractor support by default
+  // anymore so we have to opt the app in, if we detect it being used.
+  const additionalProviders = hasImport(program, rootFileNames, 'protractor') ?
+      new Map([['provideProtractorTestingSupport', '@angular/platform-browser']]) :
+      null;
+
   for (const sourceFile of sourceFiles) {
     sourceFile.forEachChild(function walk(node) {
       if (ts.isCallExpression(node) && ts.isPropertyAccessExpression(node.expression) &&
@@ -64,7 +70,8 @@ export function toStandaloneBootstrap(
 
   for (const call of bootstrapCalls) {
     call.declarations.forEach(decl => allDeclarations.add(decl));
-    migrateBootstrapCall(call, tracker, referenceResolver, typeChecker, printer);
+    migrateBootstrapCall(
+        call, tracker, additionalProviders, referenceResolver, typeChecker, printer);
   }
 
   // The previous migrations explicitly skip over bootstrapped
@@ -135,12 +142,15 @@ function analyzeBootstrapCall(
  * Converts a `bootstrapModule` call to `bootstrapApplication`.
  * @param analysis Analysis result of the call.
  * @param tracker Tracker in which to register the changes.
+ * @param additionalFeatures Additional providers, apart from the auto-detected ones, that should
+ * be added to the bootstrap call.
  * @param referenceResolver
  * @param typeChecker
  * @param printer
  */
 function migrateBootstrapCall(
-    analysis: BootstrapCallAnalysis, tracker: ChangeTracker, referenceResolver: ReferenceResolver,
+    analysis: BootstrapCallAnalysis, tracker: ChangeTracker,
+    additionalProviders: Map<string, string>|null, referenceResolver: ReferenceResolver,
     typeChecker: ts.TypeChecker, printer: ts.Printer) {
   const sourceFile = analysis.call.getSourceFile();
   const moduleSourceFile = analysis.metadata.getSourceFile();
@@ -177,6 +187,13 @@ function migrateBootstrapCall(
         nodesToCopy, referenceResolver, typeChecker);
   }
 
+  if (additionalProviders) {
+    additionalProviders.forEach((moduleSpecifier, name) => {
+      providersInNewCall.push(ts.factory.createCallExpression(
+          tracker.addImport(sourceFile, name, moduleSpecifier), undefined, undefined));
+    });
+  }
+
   if (nodesToCopy.size > 0) {
     let text = '\n\n';
     nodesToCopy.forEach(node => {
@@ -703,3 +720,27 @@ function getLastImportEnd(sourceFile: ts.SourceFile): number {
 
   return index;
 }
+
+/** Checks if any of the program's files has an import of a specific module. */
+function hasImport(program: NgtscProgram, rootFileNames: string[], moduleName: string): boolean {
+  const tsProgram = program.getTsProgram();
+  const deepImportStart = moduleName + '/';
+
+  for (const fileName of rootFileNames) {
+    const sourceFile = tsProgram.getSourceFile(fileName);
+
+    if (!sourceFile) {
+      continue;
+    }
+
+    for (const statement of sourceFile.statements) {
+      if (ts.isImportDeclaration(statement) && ts.isStringLiteralLike(statement.moduleSpecifier) &&
+          (statement.moduleSpecifier.text === moduleName ||
+           statement.moduleSpecifier.text.startsWith(deepImportStart))) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}

packages/core/schematics/test/standalone_migration_spec.ts

@@ -3647,4 +3647,94 @@ describe('standalone migration', () => {
           }).catch(e => console.error(e));
         `));
      });
+
+  it('should add Protractor support if any tests are detected', async () => {
+    writeFile('main.ts', `
+      import {AppModule} from './app/app.module';
+      import {platformBrowser} from '@angular/platform-browser';
+
+      platformBrowser().bootstrapModule(AppModule).catch(e => console.error(e));
+    `);
+
+    writeFile('./app/app.module.ts', `
+      import {NgModule, Component} from '@angular/core';
+
+      @Component({selector: 'app', template: 'hello'})
+      export class AppComponent {}
+
+      @NgModule({declarations: [AppComponent], bootstrap: [AppComponent]})
+      export class AppModule {}
+    `);
+
+    writeFile('./app/app.e2e.spec.ts', `
+      import {browser, by, element} from 'protractor';
+
+      describe('app', () => {
+        beforeAll(async () => {
+          await browser.get(browser.params.testUrl);
+        });
+
+        it('should work', async () => {
+          const rootSelector = element(by.css('app'));
+          expect(await rootSelector.isPresent()).toBe(true);
+        });
+      });
+    `);
+
+    await runMigration('standalone-bootstrap');
+
+    expect(stripWhitespace(tree.readContent('main.ts'))).toBe(stripWhitespace(`
+      import {AppComponent} from './app/app.module';
+      import {platformBrowser, provideProtractorTestingSupport, bootstrapApplication} from '@angular/platform-browser';
+
+      bootstrapApplication(AppComponent, {
+        providers: [provideProtractorTestingSupport()]
+      }).catch(e => console.error(e));
+    `));
+  });
+
+  it('should add Protractor support if any tests with deep imports are detected', async () => {
+    writeFile('main.ts', `
+      import {AppModule} from './app/app.module';
+      import {platformBrowser} from '@angular/platform-browser';
+
+      platformBrowser().bootstrapModule(AppModule).catch(e => console.error(e));
+    `);
+
+    writeFile('./app/app.module.ts', `
+      import {NgModule, Component} from '@angular/core';
+
+      @Component({selector: 'app', template: 'hello'})
+      export class AppComponent {}
+
+      @NgModule({declarations: [AppComponent], bootstrap: [AppComponent]})
+      export class AppModule {}
+    `);
+
+    writeFile('./app/app.e2e.spec.ts', `
+      import {browser, by, element} from 'protractor/some/deep-import';
+
+      describe('app', () => {
+        beforeAll(async () => {
+          await browser.get(browser.params.testUrl);
+        });
+
+        it('should work', async () => {
+          const rootSelector = element(by.css('app'));
+          expect(await rootSelector.isPresent()).toBe(true);
+        });
+      });
+    `);
+
+    await runMigration('standalone-bootstrap');
+
+    expect(stripWhitespace(tree.readContent('main.ts'))).toBe(stripWhitespace(`
+      import {AppComponent} from './app/app.module';
+      import {platformBrowser, provideProtractorTestingSupport, bootstrapApplication} from '@angular/platform-browser';
+
+      bootstrapApplication(AppComponent, {
+        providers: [provideProtractorTestingSupport()]
+      }).catch(e => console.error(e));
+    `));
+  });
 });