feat(core): optional generic type for ElementRef (#20765)

Add optional, backwards compatible generic type to `ElementRef` to
support typed `nativeElement`

Fix #13139

PR Close #20765

Author: harunurhan

packages/core/src/linker/element_ref.ts

@@ -21,7 +21,7 @@
 // Note: We don't expose things like `Injector`, `ViewContainer`, ... here,
 // i.e. users have to ask for what they need. With that, we can build better analysis tools
 // and could do better codegen in the future.
-export class ElementRef {
+export class ElementRef<T = any> {
   /**
    * The underlying native element or `null` if direct access to native elements is not supported
    * (e.g. when the application runs in a web worker).
@@ -43,7 +43,7 @@ export class ElementRef {
    * </div>
    * @stable
    */
-  public nativeElement: any;
+  public nativeElement: T;
 
-  constructor(nativeElement: any) { this.nativeElement = nativeElement; }
+  constructor(nativeElement: T) { this.nativeElement = nativeElement; }
 }

tools/public_api_guard/core/core.d.ts

@@ -362,9 +362,9 @@ export interface DoCheck {
 }
 
 /** @stable */
-export declare class ElementRef {
-    /** @stable */ nativeElement: any;
-    constructor(nativeElement: any);
+export declare class ElementRef<T = any> {
+    /** @stable */ nativeElement: T;
+    constructor(nativeElement: T);
 }
 
 /** @experimental */