Adding documentation for the new API

README.md

@@ -37,7 +37,22 @@ or using [`yarn`](https://yarnpkg.com/):
 yarn add --dev qunit-dom
 ```
 
-(This is the recommended method for Ember projects.)
+This is the recommended method for Ember projects using `ember-qunit` < 5.*.
+
+### Ember projects using `ember-qunit` >= 5.*
+
+Import and run the `setup` function in your `test-helper.js` file.
+
+```js
+// tests/test-helper.js
+import { setup } from 'qunit-dom';
+
+//...
+
+setup(QUnit.assert);
+
+//...
+```
 
 ### `<script>` Tag
 

lib/qunit-dom-modules.ts

@@ -1,4 +1,3 @@
-import type * as QUnit from 'qunit';
 import attach from './install';
 import { overrideRootElement } from './root-element';
 
@@ -8,8 +7,8 @@ interface SetupOptions {
   getRootElement?: () => Element | null;
 }
 
-export function setup(QUnit: QUnit, options: SetupOptions = {}) {
-  attach(QUnit.assert);
+export function setup(assert: Assert, options: SetupOptions = {}) {
+  attach(assert);
 
   const getRootElement =
     typeof options.getRootElement === 'function'