componentWillUnmount method
void
componentWillUnmount()
ReactJS lifecycle method that is invoked immediately before a Component is unmounted from the DOM.
Perform any necessary cleanup in this method, such as invalidating timers or cleaning up any DOM Elements that
were created in componentDidMount.
See: reactjs.org/docs/react-component.html#unmounting-componentwillunmount
Implementation
void componentWillUnmount() {}