How can "useGoogleMap" be integrated within NextJS?

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To integrate "useGoogleMap" within NextJS, you first need to install the required dependencies including "react-google-maps" and "google-maps-react".

Here are the steps you can follow:

1. Install the dependencies by running the following command in the terminal:

npm install react-google-maps google-maps-react

1. Next, create a file "GoogleMaps.js" inside the "pages" folder with the following code:

import React, { useState } from "react";
import { withGoogleMap, GoogleMap, Marker } from "react-google-maps";
import { GOOGLE_MAPS_API_KEY } from "../config/constants";

const Map = withGoogleMap(props => (
  <GoogleMap defaultZoom={8} defaultCenter={{ lat: props.lat, lng: props.lng }}>
    <Marker position={{ lat: props.lat, lng: props.lng }} />
  </GoogleMap>
));

export default function GoogleMaps() {
  const [position, setPosition] = useState({ lat: 40.7128, lng: -74.006 });

  const handleGetCurrentPosition = () => {
      navigator.geolocation.getCurrentPosition(
      pos => {
        setPosition({
          lat: pos.coords.latitude,
          lng: pos.coords.longitude
        });
      },
      err => console.log(err)
    );
  }

  return (
    <div>
      <button onClick={handleGetCurrentPosition}>Get Location</button>
      <Map
        lat={position.lat}
        lng={position.lng}
        containerElement={<div style={{ height: `400px` }} />}
        mapElement={<div style={{ height: `100%` }} />}
        googleMapURL={`https://maps.googleapis.com/maps/api/js?key=${GOOGLE_MAPS_API_KEY}`}
      />
    </div>
  );
}

1. Create a file "constants.js" inside the "config" folder and add the following code:

export const GOOGLE_MAPS_API_KEY = "YOUR_API_KEY_HERE";

1. In the "next.config.js" file, add the following code to allow the use of environment variables:

module.exports = {
  env: {
    GOOGLE_MAPS_API_KEY: process.env.GOOGLE_MAPS_API_KEY
  }
}

1. Add your Google Maps API key to the ".env.local" file:

GOOGLE_MAPS_API_KEY=YOUR_API_KEY_HERE

1. Finally, in your "pages" folder, create a file "index.js" and add the following code:

import GoogleMaps from "./GoogleMaps";

export default function Home() {
  return (
    <div>
      <GoogleMaps />
    </div>
  );
}

This will allow you to use "useGoogleMap" within your NextJS application. Note that the "GoogleMaps.js" file includes the "useGoogleMap" hook which handles the initialization of the Google Map component. The "google-maps-react" library is used to provide the Google Map component.