Vapor: The Future Of Vue

Introduction to Vue Vapor and Improving Code Efficiency

Vue has been around for 10 years and has had a significant impact in the Vue ecosystem and beyond.
Evan, the creator of Vue, wanted to do something different from other JavaScript frameworks and released Vue V2 and V3.
React has been heavily inspired by Vue, and one exciting development is Vue Vapor.
Vue Vapor aims to make code more efficient and reactive without putting too much load on the user's devices.
The traditional component tree in Vue can be similar to React, where components can have shared parent components.
When a component's state changes, all components below it have to re-render, even if they are not directly affected.
React uses the virtual DOM to identify changes and update only the necessary elements on the page.
The exact model used by Vue for this purpose is not discussed in detail, but it aims to achieve similar efficiency improvements.

Signals in Solid are used to create relationships between state and components.
Signals in Solid are called as functions, not referenced as values.
Signals update the relevant places that are calling the binding when the signal value changes.
Components in Solid act as templates, and stateful values create their own tree of updates.
Solid's signal model simplifies many aspects of app development and improves performance.
Other frameworks, including Angular, are also moving towards the signal model.
Understanding the difference between state management in Solid and other frameworks is important.

Signals are reactive primitives similar to refs used in composition APIs.
They provide dependency tracking on access and trigger side effects on mutation.
Signals have been used in frameworks like Knockout and Meteor for over a decade.
Vue's options API and React's state management library Mobx also use the same principles.
Signals are often discussed in relation to rendering models and fine-grain subscriptions.
Vue relies on compilers for optimizations, while other frameworks like Svelte and React handle it internally.
Vue is exploring a new compilation strategy called Vapor mode inspired by Solid.
Signals in Vue are exposed as a reactive getter and separate setter.
Signals ensure state mutation only occurs when the setter is explicitly called.
The syntax for signals in Vue can be replicated to mimic Solid, but without compiler benefits.
Replicating the syntax of signals in Vue may feel like faking it on both sides.
Signals in Solid require using the equals sign for binding initial signals.
Signals in Vue can be set using R.V value, similar to how it is done in Svelte.

Angular is going through a signals reinvention of the framework.
Angular's signal API allows for passing around a single value.
Angular's getter-based API style has some trade-offs in view components.
Solid's API style is less verbose for value access but more verbose for updating the value.
Solid allows passing raw signals as component props.
Solid's API design provides simplicity and trade-offs.
View is flexible and allows creating custom reactivity primitive APIs.
Vapor mode is an alternative compilation strategy in view.
Vapor mode does not use a virtual DOM.
Vapor mode compiles view SFCs into more performant JavaScript output.

In React, when a component's state changes, React reruns the component and its children. This is different from Vue.js where the state change triggers a reevaluation of all components that consume that state.
React uses a virtual DOM to update components, while Vue.js uses signals to determine which components should update. This means that Vue.js doesn't require a virtual DOM.
Vapor Mode in Vue.js is designed for performance-critical scenarios. It allows embedding a vapor component subtree into an existing Vue.js app or building an app with only vapor components.
Vapor Mode significantly reduces the baseline runtime size by removing the virtual DOM runtime from the bundle.
Vapor Mode only supports a subset of Vue.js features, specifically the Composition API and script setup. However, this subset works the same way for both vapor and non-vapor components.
Vapor Mode allows for granular opt-in at the component level, enabling the mixing of vapor and non-vapor components in the same app.
Vapor Mode provides a custom Vue.js version, called the Vue SFC playground, for experimenting with vapor components and observing their effects.
Vapor Mode simplifies state binding and input handling compared to React, making it more performant in certain scenarios.

The code demonstrates the use of template values in Vue.js, which allows for rerunning when changes occur.
The code includes bindings for H1, input, and B elements.
The input is bound to the "update model value" event, which updates the message variable.
The code is relatively concise, with only 52 lines of compiled output and minimal imports from Vue.js.
The use of directives, such as V-model, text, and class, influences the generation of templates.
The code showcases the benefits of using Vapor mode in Vue.js, including reduced code complexity and improved SSR rendering.
The non-Vapor mode code is more fragile and relies on external dependencies.
The non-Vapor mode code involves a nested flow and the creation of virtual elements for display bindings.
The non-Vapor mode code is more computationally complex compared to Vapor mode.
The code highlights the advantages of using template-based rendering in Vue.js for SSR.