Created
          July 30, 2020 06:32 
        
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    ReactJS hook for using an event listener
  
        
  
    
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  | export function useEventListener(eventName: string, handler: () => void) { | |
| let savedHandler = useRef<() => void>() | |
| useEffect(() => { | |
| savedHandler.current = handler | |
| }, [handler]) | |
| useEffect(() => { | |
| let eventListener = () => savedHandler.current?.() | |
| [Your event emitter here].addListener(eventName, eventListener) | |
| return () => { | |
| [Your event emitter here].removeListener(eventName, eventListener) | |
| } | |
| }, []) | |
| } | 
  
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