[Bug] Event listener on map initialized by defaultBounds causes warning in console

[mfavetti]

Description

Warning in console when initializing a map with defaultBounds and adding an event listener:

main.js:169 [createEvent] at least one of the values from the map returned undefined. This is not expected to happen. Please report an issue at https://github.com/visgl/react-google-maps/issues/new

Steps to Reproduce

import React from 'react';
import {
  APIProvider,
  Map,
} from '@vis.gl/react-google-maps';

import './App.css';

const API_KEY = '';
const MAP_ID = '';

export default function MyApp() {
  return (
    <APIProvider apiKey={API_KEY}>
      <Map
        id="map"
        mapId={MAP_ID}
        defaultBounds={{north: 45, south: 0, east: 0, west: 45}}
        onCenterChanged={() => {console.log('center changed')}}
      />
    </APIProvider>
  );
}

Environment

• Library version: 1.2.0
• Google maps version: weekly
• Browser and Version: Chrome 129.0.6668.70
• OS: Mint 22

Logs

main.js:169 [createEvent] at least one of the values from the map returned undefined. This is not expected to happen. Please report an issue at https://github.com/visgl/react-google-maps/issues/new
createMapEvent	@	use-map-events.ts:104
(anonymous)	@	use-map-events.ts:66
_.nk	@	main.js:169
tk	@	main.js:170
_.rk.set	@	main.js:294
(anonymous)	@	main.js:177
d	@	map.js:23
iC	@	map.js:24
(anonymous)	@	main.js:414
Promise.then		
fn.fitBounds	@	main.js:414
(anonymous)	@	use-map-instance.ts:157
commitHookEffectListMount	@	react-dom.development.js:23189
commitPassiveMountOnFiber	@	react-dom.development.js:24965
commitPassiveMountEffects_complete	@	react-dom.development.js:24930
commitPassiveMountEffects_begin	@	react-dom.development.js:24917
commitPassiveMountEffects	@	react-dom.development.js:24905
flushPassiveEffectsImpl	@	react-dom.development.js:27078
flushPassiveEffects	@	react-dom.development.js:27023
(anonymous)	@	react-dom.development.js:26808
workLoop	@	scheduler.development.js:266
flushWork	@	scheduler.development.js:239
performWorkUntilDeadline	@	scheduler.development.js:533
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[mfavetti]

This prevents the warning:

<Map
        id="map"
        mapId={MAP_ID}
        defaultBounds={{north: 45, south: 0, east: 0, west: 45}}
        onCenterChanged={() => {console.log('center changed')}}
        defaultCenter={{lat: 0, lng: 0}}
        defaultZoom={1}
      />

[mfavetti]

I tried some other events and so far onCenterChanged is the only one I can reproduce with.

[usefulthink]

Thanks! The official documentation doesn't have any information on why the types for map.center etc are specified as "might be undefined" and in about ten years with the maps API, I never encountered a situation where they were in fact undefined. That is why I added that error-message so I can finally learn in which situation that will happen :)

I'll figure out how we can prevent that from being a problem...