When adding Google Maps to your react application using the library @react-google-maps/api, you run into issues when having multiple components loading a map. In this gist you'll find a component and a hook to resolve these issues and to simplify integrating the library in your application.

App.tsx

import React, { FC } from 'react';
import { GoogleMap } from '@react-google-maps/api';
import { useGoogleMaps } from './GoogleMapsProvider';

const containerStyle = {
  width: '400px',
  height: '400px'
};

const center = {
  lat: -3.745,
  lng: -38.523
};

const App: FC = () => {
  const { isLoaded } = useGoogleMaps();

  return isLoaded
    ? (
      <GoogleMap
        mapContainerStyle={containerStyle}
        center={center}
        zoom={10}
      />
    )
    : (
      <div>Loading...</div>
    );
};

GoogleMapsProvider.tsx

import React, { createContext, FC, useContext } from 'react';
import { useJsApiLoader } from '@react-google-maps/api';
import { UseLoadScriptOptions } from '@react-google-maps/api/dist/useJsApiLoader';

export type GoogleMapsState = {
  isLoaded: boolean;
  loadError?: Error;
};

const GoogleMapsContext = createContext<GoogleMapsState>({ isLoaded: false });

export const GoogleMapsProvider: FC<UseLoadScriptOptions> = ({ children, ...loadScriptOptions }) => {
  const { isLoaded, loadError } = useJsApiLoader(loadScriptOptions);

  return (
    <GoogleMapsContext.Provider value={{ isLoaded, loadError }}>
      {children}
    </GoogleMapsContext.Provider>
  );
};

export const useGoogleMaps = () => useContext(GoogleMapsContext);

index.tsx

import { Libraries } from "@react-google-maps/api/dist/utils/make-load-script-url";
import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { BrowserRouter as Router } from "react-router-dom";
import App from 'app';
import store from 'state/store';

import { GoogleMapsProvider } from './GoogleMapsProvider';

const googleMapsApiKey = 'abracadabra';
const googleMapsLibraries: Libraries = [ 'places' ];

ReactDOM.render(
  <React.StrictMode>
    <Router>
      <Provider store={store}>
        <GoogleMapsProvider googleMapsApiKey={googleMapsApiKey} language="en" libraries={googleMapsLibraries}>
          <App />
        </GoogleMapsProvider>
      </Provider>
    </Router>
  </React.StrictMode>,
  document.getElementById('root')
);