diff --git a/src/index.ts b/src/index.ts
index 15b1e9a..8d02b8d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -310,8 +310,9 @@ export async function click (selector:Element|string):Promise<void> {
  *   converted to a CustomEvent or not an instance of Event.
  */
 export function event (
-    event:string|InstanceType<typeof Event>|InstanceType<typeof CustomEvent<any>>,
-    element?:Element|Window
+    event:CustomEvent|Event|string,
+    // event:string|InstanceType<typeof Event>|InstanceType<typeof CustomEvent<any>>,
+    element?:Element|Window|null
 ):void {
     element = (element instanceof Window ? element : toElement(element))
 
diff --git a/src/util.ts b/src/util.ts
index 0367725..12100d7 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -13,7 +13,7 @@
  *
  */
 export function toElement (
-    _selector?:string|HTMLElement|Element
+    _selector?:string|HTMLElement|Element|null
 ):Element|InstanceType<typeof Window> {
     if (!_selector) return window