isMounted Module

isMounted.js

import React from 'react';

export default function isMounted(component) {
  // exceptions for flow control :(
  try {
    React.findDOMNode(component);
    return true;
  } catch (e) {
    // Error: Invariant Violation: Component (with keys: props,context,state,refs,_reactInternalInstance) contains `render` method but is not mounted in the DOM
    return false;
  }
};

//inside your component import this file ^ and do
isMounted(this)