# Dom.EventOf

Extracts the native Event parameter from an event-handler input.

## Signatures

```ts
export type EventOf<Handler> = NonNullable<Handler> extends (...args: infer Args) => any ? Args[0] extends globalThis.Event ? Args[0] : globalThis.Event : globalThis.Event;
```

## Why

Host prop merging must preserve the concrete browser event type while
combining user and internal handlers.

## Ownership and lifetime

Type-only; listener lifetime remains owned by the rendered template Scope.