Unsubscribe from Geolocation.watchPosition() in desktop browsers results in an error.

[arlowhite]

ionic info

Cordova CLI: 6.1.1
Ionic Framework Version: 2.0.0-beta.6
Ionic CLI Version: 2.0.0-beta.25
Ionic App Lib Version: 2.0.0-beta.15
OS: Distributor ID: Ubuntu Description: Ubuntu 16.04 LTS
Node Version: v5.11.1

rxjs: 5.0.0-beta.6
ionic-native: 1.2.2 - 1.2.4

cordova-plugin-geolocation version: 2.2.0

Chrome Version 50.0.2661.102 (64-bit) - 51.0.2704.84 (64-bit)
Firefox 47.0

When testing my app with ionic serve in Chrome Dev tools, I get an error when unsubscribing.
http://ionicframework.com/docs/v2/native/geolocation/
However, the same code works fine on my Android device.

In Chrome Dev Tools, I see this warning:
"Unable to clear the previous observable watch for Geolocation watchPosition"
Followed by the stacktrace:

TypeError: Illegal invocation
(anonymous function) @ plugin.js:142
tryCatcher @ tryCatch.js:6
Subscription.unsubscribe @ Subscription.js:29
tryCatcher @ tryCatch.js:6
Subscription.unsubscribe @ Subscription.js:41
Subscriber.unsubscribe @ Subscriber.js:71
tryCatcher @ tryCatch.js:6
Subscription.unsubscribe @ Subscription.js:41
Subscriber.unsubscribe @ Subscriber.js:71
RefCountSubscriber._unsubscribe @ ConnectableObservable.js:123
tryCatcher @ tryCatch.js:6
Subscription.unsubscribe @ Subscription.js:29
Subscriber.unsubscribe @ Subscriber.js:71
tryCatcher @ tryCatch.js:6
Subscription.unsubscribe @ Subscription.js:41
Subscriber.unsubscribe @ Subscriber.js:71
SightingEditPage.onPageWillLeave @ sighting-edit.ts:82

(cutoff rest of stacktrace, unsubscribe is called in onPageWillLeave)

[arlowhite]

EDIT: A previous version of this issue suggested that .map() .publishBehavior().refCount() did not work as expected. However, this is working fine for me now on Android. So I must have made a build or coding mistake when reporting the issue.

[ihadeed]

Sorry @arlowhite, I'm a bit confused here.

Are you still experiencing issues with the GeoLocation plugin?

[mlynch]

I did notice the README had an incorrect example of calling unsubscribe. You call it on the return from subscribe not from watchPosition. Updating now...

[arlowhite]

Updated ionic-native to 1.2.4, no effect.
cordova-plugin-geolocation version: 2.2.0 (same as when bug first created)

Yes, I still see this error with Chrome and Firefox; in Firefox, the message is different:

TypeError: 'clearWatch' called on an object that does not implement interface Geolocation.
Stack trace:
wrapObservable/</<@http://localhost:8100/build/js/app.bundle.js:75831:24
tryCatcher@http://localhost:8100/build/js/app.bundle.js:101172:16
[505]</Subscription</Subscription.prototype.unsubscribe@http://localhost:8100/build/js/app.bundle.js:89968:25
tryCatcher@http://localhost:8100/build/js/app.bundle.js:101172:16

Just to clarify, there's no issue when running on my Android device. This error is only seen when developing on the desktop in Chrome or Firefox while using ionic serve.

I can't test Internet Explorer since I'm on Linux and don't have my development environment setup in Windows.

You don't see this error when unsubscribing in a desktop browser environment?

I would say this is a minor bug that almost isn't worth hunting down except for the fact that it may worry developers when they see it. And it's not good to have a method that errors in the development environment but works when deployed to a mobile device.