useForceUpdate

useForceUpdate is a React hook that you can call to force a function component to re-render.

useForceUpdate does not serve a purpose in and of itself. It is a tiny package that aims to be integrated into larger hooks, making obsolete any class functionality that is still reliant on this.forceUpdate().

Install

• npm install use-force-update or
• yarn add use-force-update

Usage

In its simplest form, useForceUpdate re-renders a component.

import useForceUpdate from 'use-force-update';

let renderCount = 0;

export default function MyButton() {
  const forceUpdate = useForceUpdate();

  renderCount++;
  return (
    <>
      <p>I have rendered {renderCount} times.</p>
      <button onClick={forceUpdate}>
        Re-render
      </button>
    </>
  );
};

In its ideal form, useForceUpdate integrates with event emitters, such as state managers.

import { useEffect } from 'react';
import useForceUpdate from 'use-force-update';
import store from './store';

export default function MyButton() {
  const forceUpdate = useForceUpdate();

  const username = store.get('username');

  useEffect(() => {
    // When the username changes, re-render this component.
    const selector = state => state.username;
    const unsubscribe = store.subscribe(selector, forceUpdate);

    // When we unmount, stop re-rendering this component.
    return () => {
      unsubscribe();
    };
  }, [forceUpdate]);

  if (username === null) {
    return <p>You are not logged in.</p>;
  }

  return <p>Hello, {username}!</p>;
};