Use-is-mounted-ref NPM

Motivation

Avoid memory leaks setting states when component are unmounted;
Control when component already mounted;
Common error when setting state to unmounted component:

Warning: Can only update a mounted or mounting component. This usually means you called setState, replaceState, or forceUpdate on an unmounted component. This is a no-op.

Usage

To start using the use-is-mounted-ref in your project, first install in your project:

yarn add use-is-mounted-ref or npm install use-is-mounted-ref

import { useState, useEffect } from 'react';
import useIsMountedRef from 'use-is-mounted-ref';

function App() {
  const isMountedRef = useIsMountedRef();

  const initialState = {
    loading: false,
    error: false,
    data: [],
  };

  const [state, setState] = useState(initialState);

  useEffect(() => {
    fetch('https://www.reddit.com/.json')
      .then((response) => response.json())
      .then(({ data }) => {
        if (isMountedRef.current) {
          setState((prevState) => {
            return {
              ...prevState,
              loading: false,
              data,
            };
          });
        }
      })
      .catch((err) => {
        if (isMountedRef.current) {
          setState((prevState) => {
            return { ...prevState, loading: false, error: true };
          });
        }
      });
  }, []);

  return state.loading ? 'Loading...' : 'Found Data!';
}

export default App;