Function useHandler

useHandler<A extends any[], R>(
fn: ((...args: A) => R) | null | undefined,
): (...args: A) => R | undefined
Returns a stable function identity that is a no-op during the initial render and after the component is unmounted.
Type Parameters
- A extends any[]
  The handler argument types.
- R
  The handler return value.
Parameters
- fn: ((...args: A) => R) | null | undefined
  A callback that is invoked by the returned handler.
Returns (...args: A) => R | undefined
A stable function identity.
Example
```
function MyComponent(props) {
  // Handler identity never changes
  const handleClick = useHandler(props.onClick);
}
```