Export type for Target

(cherry picked from commit 5689e67)

addon-test-support/@ember/test-helpers/index.ts

@@ -69,6 +69,7 @@ export { default as find } from './dom/find';
 export { default as findAll } from './dom/find-all';
 export { default as typeIn } from './dom/type-in';
 export { default as scrollTo } from './dom/scroll-to';
+export type { default as Target } from './dom/-target';
 
 // Declaration-merge for our internal purposes.
 declare module '@ember/runloop' {

type-tests/api.ts

@@ -65,6 +65,7 @@ import {
   DebugInfo as InternalDebugInfo,
   DeprecationFailure,
   Warning,
+  Target,
 } from '@ember/test-helpers';
 import { ComponentInstance } from '@glimmer/interfaces';
 import { Owner } from '@ember/test-helpers/build-owner';
@@ -73,8 +74,6 @@ import EmberResolver from 'ember-resolver';
 import Application from '@ember/application';
 import { TemplateFactory } from 'ember-cli-htmlbars';
 
-type Target = string | Element | Document | Window;
-
 // DOM Interaction Helpers
 expectTypeOf(blur).toEqualTypeOf<(target?: Target) => Promise<void>>();
 expectTypeOf(click).toEqualTypeOf<