Subscribe is deprecated: Use an observer instead of an error callback

Solution 1:

subscribe isn't deprecated, only the variant you're using is deprecated. In the future, subscribe will only take one argument: either the next handler (a function) or an observer object.

So in your case you should use:

.subscribe({
   next: this.handleUpdateResponse.bind(this),
   error: this.handleError.bind(this)
});

See these GitHub issues:

• https://github.com/ReactiveX/rxjs/pull/4202

• https://github.com/ReactiveX/rxjs/issues/4159

Solution 2:

Maybe interesting to note that the observer Object can also (still) contain the complete() method and other, additional properties. Example:

.subscribe({
    complete: () => { ... }, // completeHandler
    error: () => { ... },    // errorHandler 
    next: () => { ... },     // nextHandler
    someOtherProperty: 42
});

This way it is much easier to omit certain methods. With the old signature it was necessary to supply undefined and stick to the order of arguments. Now it's much clearer when for instance only supplying a next and complete handler.