refactor(upgrade): create a helper for cleaning jqLite/jQuery data (a…

…ngular#40045)

This commit moves the code for cleaning jqLite/jQuery data on an element
to a re-usable helper function. This way it is easier to keep the code
consistent across all places where we need to clean data (now and in the
future).

PR Close angular#40045

packages/upgrade/src/common/src/downgrade_component_adapter.ts

@@ -8,10 +8,10 @@
 
 import {ApplicationRef, ChangeDetectorRef, ComponentFactory, ComponentRef, EventEmitter, Injector, OnChanges, SimpleChange, SimpleChanges, StaticProvider, Testability, TestabilityRegistry, Type} from '@angular/core';
 
-import {element as angularElement, IAttributes, IAugmentedJQuery, ICompileService, INgModelController, IParseService, IScope} from './angular1';
+import {IAttributes, IAugmentedJQuery, ICompileService, INgModelController, IParseService, IScope} from './angular1';
 import {PropertyBinding} from './component_info';
 import {$SCOPE} from './constants';
-import {getTypeName, hookupNgModel, strictEquals} from './util';
+import {cleanData, getTypeName, hookupNgModel, strictEquals} from './util';
 
 const INITIAL_VALUE = {
   __UNINITIALIZED__: true
@@ -241,12 +241,7 @@ export class DowngradeComponentAdapter {
         //
         // To ensure the element is always properly cleaned up, we manually call `cleanData()` on
         // this element and its descendants before destroying the `ComponentRef`.
-        //
-        // NOTE:
-        // `cleanData()` also will invoke the AngularJS `$destroy` event on the element:
-        //   https://github.com/angular/angular.js/blob/2e72ea13fa98bebf6ed4b5e3c45eaf5f990ed16f/src/Angular.js#L1932-L1945
-        angularElement.cleanData(this.element);
-        angularElement.cleanData((this.element[0] as Element).querySelectorAll('*'));
+        cleanData(this.element[0]);
 
         destroyComponentRef();
       }

packages/upgrade/src/common/src/upgrade_helper.ts

@@ -10,7 +10,7 @@ import {ElementRef, Injector, SimpleChanges} from '@angular/core';
 
 import {DirectiveRequireProperty, element as angularElement, IAugmentedJQuery, ICloneAttachFunction, ICompileService, IController, IControllerService, IDirective, IHttpBackendService, IInjectorService, ILinkFn, IScope, ITemplateCacheService, SingleOrListOrMap} from './angular1';
 import {$COMPILE, $CONTROLLER, $HTTP_BACKEND, $INJECTOR, $TEMPLATE_CACHE} from './constants';
-import {controllerKey, directiveNormalize, isFunction} from './util';
+import {cleanData, controllerKey, directiveNormalize, isFunction} from './util';
 
 
 
@@ -125,15 +125,7 @@ export class UpgradeHelper {
       controllerInstance.$onDestroy();
     }
     $scope.$destroy();
-
-    // Clean the jQuery/jqLite data on the component+child elements.
-    // Equivelent to how jQuery/jqLite invoke `cleanData` on an Element (this.element)
-    //  https://github.com/jquery/jquery/blob/e743cbd28553267f955f71ea7248377915613fd9/src/manipulation.js#L223
-    //  https://github.com/angular/angular.js/blob/26ddc5f830f902a3d22f4b2aab70d86d4d688c82/src/jqLite.js#L306-L312
-    // `cleanData` will invoke the AngularJS `$destroy` DOM event
-    //  https://github.com/angular/angular.js/blob/26ddc5f830f902a3d22f4b2aab70d86d4d688c82/src/Angular.js#L1911-L1924
-    angularElement.cleanData([this.element]);
-    angularElement.cleanData(this.element.querySelectorAll('*'));
+    cleanData(this.element);
   }
 
   prepareTransclusion(): ILinkFn|undefined {

packages/upgrade/src/common/src/util.ts

@@ -8,7 +8,7 @@
 
 import {Injector, Type} from '@angular/core';
 
-import {IInjectorService, INgModelController} from './angular1';
+import {element as angularElement, IInjectorService, INgModelController} from './angular1';
 import {DOWNGRADED_MODULE_COUNT_KEY, UPGRADE_APP_TYPE_KEY} from './constants';
 
 const DIRECTIVE_PREFIX_REGEXP = /^(?:x|data)[:\-_]/i;
@@ -25,6 +25,25 @@ export function onError(e: any) {
   throw e;
 }
 
+/**
+ * Clean the jqLite/jQuery data on the element and all its descendants.
+ * Equivalent to how jqLite/jQuery invoke `cleanData()` on an Element when removed:
+ *   https://github.com/angular/angular.js/blob/2e72ea13fa98bebf6ed4b5e3c45eaf5f990ed16f/src/jqLite.js#L349-L355
+ *   https://github.com/jquery/jquery/blob/6984d1747623dbc5e87fd6c261a5b6b1628c107c/src/manipulation.js#L182
+ *
+ * NOTE:
+ * `cleanData()` will also invoke the AngularJS `$destroy` DOM event on the element:
+ *   https://github.com/angular/angular.js/blob/2e72ea13fa98bebf6ed4b5e3c45eaf5f990ed16f/src/Angular.js#L1932-L1945
+ *
+ * @param node The DOM node whose data needs to be cleaned.
+ */
+export function cleanData(node: Node): void {
+  angularElement.cleanData([node]);
+  if (isParentNode(node)) {
+    angularElement.cleanData(node.querySelectorAll('*'));
+  }
+}
+
 export function controllerKey(name: string): string {
   return '$' + name + 'Controller';
 }
@@ -53,6 +72,10 @@ export function isFunction(value: any): value is Function {
   return typeof value === 'function';
 }
 
+function isParentNode(node: Node|ParentNode): node is ParentNode {
+  return isFunction((node as unknown as ParentNode).querySelectorAll);
+}
+
 export function validateInjectionKey(
     $injector: IInjectorService, downgradedModule: string, injectionKey: string,
     attemptedAction: string): void {