docs: update useEventListener doc

src/useEventListener/useEventListener.mdx

@@ -6,3 +6,21 @@ date: '2020-06-28'
 Use EventListener with simplicity by React Hook.
 
 Supports `Window`, `Element` and `Document` and custom events with almost the same parameters as the native [`addEventListener` options](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#syntax). See examples below.
+
+If you want to use your CustomEvent using Typescript, you have to declare the event type.
+Find witch kind of Event you want to extends:
+
+- `MediaQueryListEventMap`
+- `WindowEventMap`
+- `HTMLElementEventMap`
+- `DocumentEventMap`
+
+Then declare your custom event:
+
+```ts
+declare global {
+  interface DocumentEventMap {
+    'my-custom-event': CustomEvent<{ exampleArg: string }>
+  }
+}
+```