Defining components with options seems to be much more organized than mixing everything together in a big function! In other words, while the Composition API raises the upper bound of code quality, it also lowers the lower bound. Having props as a separate argument makes it easier to type it individually (see TypeScript-only Props Typing below) without messing up the types of other properties on the context. Check if an object is a reactive proxy created by reactive.
Evan You, the creator of Vue, has described the Composition API as a reactive API coupled with the ability to register lifecycle hooks usin…
This pattern can be applied to all the other logical concerns in the component, resulting in a number of nicely decoupled functions: This comparison excludes import statements and the setup() function. Check if an object is a readonly proxy created by readonly. A readonly proxy is deep: any nested property accessed will be readonly as well. Composition functions can also be folded in the editor to make the component much easier to scan: The setup() function now primarily serves as an entry point where all the composition functions are invoked: Granted, this is code that we didn't have to write when using the options API. Rendering something in the DOM is considered a "side effect": our program is modifying state external to the program itself (the DOM). You will notice that code related to a specific logical concern is often fragmented and scattered all over the place. Internally, Vue will perform special treatment for refs so that when a ref is encountered on the render context, the context directly exposes its inner value. The Composition API is a new (and optional) way of creating and organizing components in a Vue 3 application. Take the Vue CLI UI file explorer as an example. A reactive value wouldn't be very useful if it cannot retain its reactivity when assigned as a property or returned from functions. As our needs grew, we needed a framework... Autofac is an inversion of control container for .NET. The difference between using ref and reactive can be somewhat compared to how you would write standard JavaScript logic: If using ref, we are largely translating style (1) to a more verbose equivalent using refs (in order to make the primitive values reactive). Download the Vue 3 Cheat Sheet . In addition to computed refs, we can also directly create plain mutable refs using the ref API: We can expose a ref as a property on the render context. The function is also somewhat self-documenting due to its descriptive name. Return the raw, original object of a reactive or readonly proxy. Mixins can potentially clash on property and method names, while HOCs can clash on expected prop names. Here's a side-by-side example: Svelte code looks more concise because it does the following at compile time: Technically, we can do the same in Vue (and it's possible via userland Babel plugins). Another common feature request from developers working on large projects is better TypeScript support. This is because JavaScript primitive types are passed by value, not by reference: The same problem would occur when a value is assigned to an object as a property.
That said, this is technically feasible in userland as a Babel plugin. As we’re moving toward ASP.NET Core ... We’ve spotted some strange behavior before with ASP.NET Core and JSON serialization/deserialization, and I eventually made it back to try... As we create CSS components in our internal framework, we typically try to use little if no JS. The Composition API enables us to do the same for Vue component code.
Check out this to see how the new refs system can be used for both logical state and template refs. Many Vue plugins today inject properties onto this. It surely is difficult. The Composition API is a new optional syntax in Vue 3 that provides developers a new way to create components and organize them by feature instead of operation. In other words, Vue's existing API simply wasn't designed with type inference in mind, and that creates a lot of complexity when trying to make it work nicely with TypeScript. In addition to 2.x lifecycle equivalents, the Composition API also provides the following debug hooks: Both hooks receive a DebuggerEvent similar to the onTrack and onTrigger options for watchers: provide and inject enables dependency injection similar to the 2.x provide/inject options. Composition functions expecting or returning only primitive types also need to wrap the value in an object just for reactivity's sake. Making it available will likely cause confusions when using setup() along other 2.x options. If setup returns an object, the properties on the object will be merged on to the render context for the component's template: Note that refs returned from setup are automatically unwrapped when accessed in the template so there's no need for .value in templates. Composition API also provides a watch function that behaves exactly the same as the 2.x option. Another reason for avoiding this in setup() is a very common pitfall for beginners: To get type inference for the arguments passed to setup(), the use of defineComponent is needed. This p... Stay fresh! Here, the returned state is a reactive object that all Vue users should be familiar with. Create a ref that tracks its own .value mutation but doesn't make its value reactive. It serves as the entry point for using the Composition API inside components. toRef can be used to create a ref for a property on a source reactive object. The forced separation via options obscures the underlying logical concerns. . If we color-code each of these logical concerns, we notice how fragmented they are when expressed with component options: Such fragmentation is exactly what makes it difficult to understand and maintain a complex component. Both callbacks will receive a debugger event which contains information on the dependency in question. Again, we don't think this should be the default since it would go against the intuition of standard JavaScript. The invalidation callback is called when: We are registering the invalidation callback via a passed-in function instead of returning it from the callback (like React useEffect) because the return value is important for async error handling. The setup function is a new component option. Takes an object and returns a reactive proxy of the original. // a function that may get called at a later stage, // mutating original will trigger watchers relying on the copy, // mutating the copy will fail and result in a warning, // invalidate previously pending async operation, // see `watchEffect` typing for shared options, // inspect which dependency is causing the component to re-render, // providing non-string value will result in error, // the DOM element will be assigned to the ref after initial render, // make sure to reset the refs before each update, // unwrapped is guaranteed to be number now, /* The primary goal of introducing the Class API was to provide an alternative API that comes with better TypeScript inference support.
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