In React Google Maps, getting “'google' is

Question

I'm trying to reproduce the example in https://tomchentw.github.io/react-google-maps/#groundoverlay in a React project created with create-react-app; what I have so far is at https://github.com/khpeek/trailmaps.

In src/components, I have a groundOverlay.js as follows:

import React from 'react';

const { compose } = require("recompose");
const {
  withScriptjs,
  withGoogleMap,
  GoogleMap,
  GroundOverlay,
} = require("react-google-maps");

const MapWithGroundOverlay = compose(
  withScriptjs,
  withGoogleMap
)(props =>
  <GoogleMap
    defaultZoom={12}
    defaultCenter={{lat: 40.740, lng: -74.18}}
  >
    <GroundOverlay
      defaultUrl="https://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg"
      defaultBounds={new google.maps.LatLngBounds(
        new google.maps.LatLng(40.712216, -74.22655),
        new google.maps.LatLng(40.773941, -74.12544)
      )}
      defaultOpacity={.5}
    />
  </GoogleMap>
);

Then, in App.js, I have

import React, { Component } from 'react';
import './App.css';
import MapWithAnOverlayView from './components/overlayView';
import MapWithGroundOverlay from './components/groundOverlay';

class App extends Component {
  render() {
    return (
      <div className="App">
        <header className="App-header">
          <h1 className="App-title">Custom Overlay</h1>
        </header>
        <MapWithGroundOverlay
          googleMapURL="https://maps.googleapis.com/maps/api/js?key=AIzaSyBimnrhiugaGSNN8WnsjpzMNJcrH_T60GI&v=3.exp&libraries=geometry,drawing,places"
          loadingElement={<div style={{ height: `100%` }} />}
          containerElement={<div style={{ height: `400px` }} />}
          mapElement={<div style={{ height: `100%` }} />}
        />
      </div>
    );
  }
}

export default App;

However, I'm getting the following error:

Any idea why this is not working? Is this not the right way to do it?

Answer 1

You need to define for eslint that google is the global variable like

/* global google */

You can put this at the top of the file where you use

defaultBounds={new google.maps.LatLngBounds(
    new google.maps.LatLng(40.712216, -74.22655),
    new google.maps.LatLng(40.773941, -74.12544)
)}

To make your code work, you need to also export correctly component from the groundOverlay.js file, like this:

/* global google */
import React from 'react';

const { compose } = require("recompose");
const {
  withScriptjs,
  withGoogleMap,
  GoogleMap,
  GroundOverlay,
} = require("react-google-maps");

const MapWithGroundOverlay = compose(
  withScriptjs,
  withGoogleMap
)(props =>
  <GoogleMap
    defaultZoom={12}
    defaultCenter={{lat: 40.740, lng: -74.18}}
  >
    <GroundOverlay
      defaultUrl="https://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg"
      defaultBounds={new google.maps.LatLngBounds(
        new google.maps.LatLng(40.712216, -74.22655),
        new google.maps.LatLng(40.773941, -74.12544)
      )}
      defaultOpacity={.5}
    />
  </GoogleMap>
);

export default MapWithGroundOverlay;

When you do this, it should work, screen below.

I will create a PR to your repo, so you will can merge it and continue working.

Pull request created: https://github.com/khpeek/trailmaps/pull/1

Answer 2

try to use declare var google; before @Component

Example:

import React, { Component } from 'react';
import './App.css';
import MapWithAnOverlayView from './components/overlayView';
import MapWithGroundOverlay from './components/groundOverlay';

declare var google;

class App extends Component {

}