![]() Just add provideClientHydration() to the providers when bootstrapping the standalone app:Īnother interesting feature related to component inputs is the ability to bind them directly to the current route variables – it can be path params, query params, etc. Non-destructive hydration is available as a developer preview, but you can try it today. This approach is much better: the server renders the app, we get it on the screen, and then when the client app gets downloaded and bootstrapped, it reuses the DOM being already in place and enriches it with client-side capabilities, such as event listeners. There are some workarounds that can be applied in order to reduce the negative effects of destructive hydration, but they are far from perfect and don’t resolve the issue itself.Īngular 16 adds support for non-destructive hydration. This has some significant drawbacks such as screen flickering and negatively impacts some Core Web Vitals such as LCP or CLS. This means that the server renders the app, we get it on the screen, and then when the client app gets downloaded and bootstrapped, it completely destroys the DOM being already in place and rerenders the client app from scratch. So far, Angular apps working with SSR were using destructive hydration. Server-side rendering is the next area where we got some serious improvements in Angular 16. You can find the links in the main document linked above. RFC is split into four parts: why signals as the reactive primitive, signals API, signal-based components, and interoperability between the signals and observables. This is where the Angular team has described the initial design of signals along with the reasoning behind their decisions and, equally important, where everyone can ask questions and discuss the final solutions. In the meantime we highly encourage you to check the official RFC. If you would like to learn more about signals, please stay tuned as we are already working on the first article on this topic. It is staying and will interoperate with signals. ![]() If you are also wondering if Angular is abandoning RxJS, that’s not the case. state management libraries adopting signals and building new solutions on top of them.Īt this point, it’s worth noting that signals are optional, so you can still use Angular like you used to. These are just some highlights of signals, but there are many more areas that can be affected, e.g. This means we can have per-component (or even more granular) change detection. With signals, the framework will not only know if something really changed, but also what exactly changed. Here we come to another vital point – technically zone.js just tells the framework that something might have changed. With signals, the reactivity system will look totally different as the change detection layer will be able to rely on signal notifications and then trigger re-rendering. Right now Angular strongly relies on zone.js when it comes to change detection. So why are signals so important? Mostly because of the great impact they can (and certainly will) have on the other features of the framework. Thus we get a powerful item that is capable of notifying others of its value changes, creating a derived state in a declarative way and at the same time allowing synchronous reads with a great performance baked in. ![]() It can be a component template read, another ( computed ) signal, a special effect function, and many other items. However, apart from that, when the underlying value changes, a signal is able to notify all the nodes that depend on this signal. A signal is similar to a standard variable in the sense that it can hold a value, which you can always access synchronously. ![]() You can think of a signal as the basic unit on which the reactivity system is based. You may have already heard that signals are the new “reactive primitive” in Angular, and are wondering what that actually means. Some other frameworks, like Solid.js, have already been using them for a long time, so they’re just new to the Angular world. ![]() The concept of signals is not completely new. ![]()
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