wait for Element Upgrade in connectedCallback: FireFox and Chromium differences

I think the Chrome/Safari behaviour is less intuitive for the beginners, but with some more complex scenarios (for example with child custom elements) then it is much more consistant. See the different examples below. They act strangely in Firefox… Another use case that I don’t have the courage to code: when a document is parsed, … Read more

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

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