Revert "test(elements): only declare helpers if needed (#36114)"

This reverts commit 7e56222afbede515b0d5bcd8a74cd57db13dd9ad
because it is causing the side effects test to break on the
9.1.x branch.

packages/elements/test/create-custom-element_spec.ts

@@ -110,30 +110,32 @@ if (browserDetection.supportsCustomElements) {
          expect(strategy.inputs.get('fooFoo')).toBe('foo-foo-value');
          expect(strategy.inputs.get('barBar')).toBe('barBar-value');
        });
+  });
+}
 
-    // Helpers
+// Helpers
-    @Component({
+@Component({
   selector: 'test-component',
   template: 'TestComponent|foo({{ fooFoo }})|bar({{ barBar }})',
-    })
+})
-    class TestComponent {
+class TestComponent {
   @Input() fooFoo: string = 'foo';
   // TODO(issue/24571): remove '!'.
   @Input('barbar') barBar!: string;
 
   @Output() bazBaz = new EventEmitter<boolean>();
   @Output('quxqux') quxQux = new EventEmitter<Object>();
-    }
+}
-    @NgModule({
+@NgModule({
   imports: [BrowserModule],
   declarations: [TestComponent],
   entryComponents: [TestComponent],
-    })
+})
-    class TestModule implements DoBootstrap {
+class TestModule implements DoBootstrap {
   ngDoBootstrap() {}
-    }
+}
 
-    class TestStrategy implements NgElementStrategy {
+export class TestStrategy implements NgElementStrategy {
   connectedElement: HTMLElement|null = null;
   disconnectCalled = false;
   inputs = new Map<string, any>();
@@ -155,14 +157,12 @@ if (browserDetection.supportsCustomElements) {
   setInputValue(propName: string, value: string): void {
     this.inputs.set(propName, value);
   }
-    }
+}
 
-    class TestStrategyFactory implements NgElementStrategyFactory {
+export class TestStrategyFactory implements NgElementStrategyFactory {
   testStrategy = new TestStrategy();
 
   create(): NgElementStrategy {
     return this.testStrategy;
   }
-    }
-  });
 }