# EventHandler.EventOf

Extracts the native event type accepted by an `EventHandler`.

## Signatures

```ts
export type EventOf<T> = T extends EventHandler<infer Ev, infer _E, infer _R> ? Ev : never;
```

## Why

Integrations can recover the browser event type accepted by the handler.
EventSource invokes that handler with its forwarding `Proxy`, so the static
event type is preserved even though callback object identity is distinct.

## Ownership and lifetime

This is a compile-time projection and owns no event object.

## Examples

```ts
import type { EventHandler, EventOf } from "@typed/template/EventHandler"

type Click = EventOf<EventHandler<MouseEvent>>
```