## What's New

### Support the _mounted_ function when starting a component manually

> Dec, 8, 2023

When using a component in JSX, AppRun always invokes the the _mounted_ lifecycle function each time the component is loaded.

```js
class ComponentClass extends Component {
  mounted = () => console.log('mounted is called');
}
app.render(document.body, <ComponentClass />);
```

However, the _mounted_ function is not called when you start the component manully in the previous versions.

```js
class ComponentClass extends Component {
  mounted = () => console.log('mounted is called'); // not called in previous versions
}
new ComponentClass().start(document.body);
```

Now, the _mounted_ function is called when the component is started.

```js
class ComponentClass extends Component {
  mounted = () => console.log('mounted is called'); // called in this version
}
new ComponentClass().start(document.body);
```

This change make the _mounted_ funciton compatible in JSX and in manual start.


### Support View Transition API

> September, 27, 2023

AppRun now supports the [View Transition API](https://developer.mozilla.org/en-US/docs/Web/API/TransitionEvent) at the event level, component level and app level.

Event level example:

```js
const update = {
  '+1': [state => state + 1, {transition: true}],
  '-1': [state => state - 1, {transition: true}]
};
```

Component level example:

```js
class C extends Component {

}
new C().mount(document.body, {transition: true});
```


App level example:

```js
app.start(document.body, {transition: true});
```

### Vite Support

> December 11, 2022

The command `npm create apprun-app` supports [Vite](https://vitejs.dev/) in addition to esbuild and webpack.

### Use React for Rendering View

You can use React for rendering view. See [apprun-use-react](https://github.com/yysun/apprun-use-react) for details.

> React 18 has breaking changes. Please use React 17 for now.

### Create-AppRun-App CLI

> April 5 , 2022

You can create an AppRun app by running command `npm create apprun-app`.

```sh
npm create apprun-app [my-app]
```

> Note: AppRun CLI `npx apprun init` is deprecated. Please use `npm create apprun-app` instead.


## Recent Posts and Publications

### [All the Ways to Make a Web Component - May 2021 Update](https://webcomponents.dev/blog/all-the-ways-to-make-a-web-component/)

This post compares the coding style, bundle size, and performance of 55 different ways to make a Web Component. It put AppRun on the top 1/3 of the list of bundle size and performance.


### [A Dev Server Supports ESM](https://dev.to/yysun/a-dev-server-supports-esm-3cea)

This post introduces [apprun-dev-server](https://dev.to/yysun/a-dev-server-supports-esm-3cea), a dev server that provides fast and productive experiences to AppRun application development, so-called unbundled development.

### [Observerble HQ Notebooks](https://observablehq.com/@yysun)

* [Introducing AppRun](https://observablehq.com/@yysun/introducing-apprun)

### [Rust WebAssembly and AppRun](https://dev.to/yysun/rust-webassembly-and-apprun-3bei)

### [Serverless App Using Firebase and AppRun](https://dev.to/yysun/serverless-app-on-firebase-using-apprun-1k46)

### [Avoid Spaghetti Code using AppRun](https://dev.to/yysun/apprun-helps-to-avoid-spaghetti-code-1835)

### [Create a Phoenix LiveView Like App in JS with AppRun](https://dev.to/yysun/create-a-phoenix-liveview-like-app-in-js-with-apprun-dc8)

### [Reactivity in AppRun](https://dev.to/yysun/reactivity-in-apprun-31po)

### [AppRun Event Directives](https://dev.to/yysun/apprun-events-directives-4jph)

### [Ceremony vs. Essence Revisited](https://dev.to/yysun/ceremony-vs-essence-revisited-5e77)

### [Database-Driven Applications Using WebSockets](https://dev.to/yysun/database-driven-applications-using-websockets-2b9o)

This post introduces a new application architecture that allows event handling between the frontend apps and the backend business logic modules without REST API.

![](https://res.cloudinary.com/practicaldev/image/fetch/s--ydBm2YgN--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://github.com/yysun/apprun-websockets-sqlite/raw/master/architecture-new.png)

Published on Mar 9, 2020 6 min read

### [Use State Machine in AppRun Applications](https://dev.to/yysun/use-state-machine-in-apprun-applications-odo)

This post describes how to create a state machine in AppRun applications to help event handling using a calculator as an example.

![](https://dev-to-uploads.s3.amazonaws.com/i/fp4aodv0sdnbkosvuxgt.png)

Published on Mar 3, 2020 ・ 6 min read

### [Advanced View Features in AppRun](https://dev.to/yysun/advanced-view-features-in-apprun-17g5)

This post describes the advanced usage of the AppRun _ref_, _element embedding_, and _directive_ in the JSX view.

Published on Feb 28, 2020 ・ 4 min read

### [Strong Typing in AppRun](https://medium.com/@yiyisun/strong-typing-in-apprun-78520be329c1)

This post is a complete guide for those want to opted-in TypeScript and strong typing for AppRun application development.

![](https://cdn-images-1.medium.com/max/1600/1*RY-DEfVgOjj_clIEW4HeTA.png)

Published on May 17, 2019 · 8 min read

### [Announcing AppRun Directives](https://medium.com/@yiyisun/announcing-apprun-directives-6a063f88379c)

This post introduces the two built-in directives and then describes how to create custom directives.

Published on May 12, 2019 · 3 min read

### [AppRun Book from Apress](https://www.amazon.com/Practical-Application-Development-AppRun-High-Performance/dp/1484240685/)

[![Order from Amazon](https://camo.githubusercontent.com/99fad1f024c274a3d752a1583cf125037583811c/68747470733a2f2f696d616765732e737072696e6765722e636f6d2f7367772f626f6f6b732f6d656469756d2f393738313438343234303638372e6a7067)](https://www.amazon.com/Practical-Application-Development-AppRun-High-Performance/dp/1484240685/)

Published on Jan 9, 2019

### [Make CLI Run in the Console](https://dev.to/yysun/make-cli-run-in-the-console-42ho)

We have been using the command-line interface (CLI) in the terminal window and the command prompt. Have you thought of a CLI in the console of the browser's developer tool?

![](https://res.cloudinary.com/practicaldev/image/fetch/s--5p8ESaes--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://thepracticaldev.s3.amazonaws.com/i/khumq8np94i5uwo9bwn1.png)

Published on Aug 10, 2018 · 1 min read

### [Making ASP.NET Core MVC Apps into Single Page Apps using AppRun](https://medium.com/@yiyisun/making-asp-net-core-mvc-apps-into-single-page-apps-using-apprun-e1ae4dbc60da)

A single-page application (SPA) is a web application or web site that interacts with the user by dynamically rewriting the current page…

![](https://cdn-images-1.medium.com/max/1600/1*1ZtgK-R4YDb8P4ahLq60Hg.png)

Published on Aug 7, 2018 · 3 min read

### [I Also Created the Exact Same App Using AppRun](https://medium.com/@yiyisun/i-also-created-the-exact-same-app-using-apprun-dd1860cb8112)

I felt it was quite fun to compare AppRun with Redux and React Context API last time. Today, I found another great post titled “I created…

![](https://cdn-images-1.medium.com/max/1600/1*DWsG3B2utcEmD1rKSbIVpA.png)

Published on Aug 5, 2018 · 7 min read

### [Redux vs. The React Context API vs. AppRun](https://medium.com/@yiyisun/redux-vs-the-react-context-api-vs-apprun-f324bee8cbbf)
Recently, I have read a great post titled ‘Redux vs. The React Context API’ (https://daveceddia.com/context-api-vs-redux). It is the type…

![](https://cdn-images-1.medium.com/max/1600/1*_bvkERxKewur67C5zowOBQ.png)

Published on Jul 31, 2018 · 3 min read

### [Deep Dive into AppRun Events](https://medium.com/@yiyisun/deep-dive-into-apprun-events-1650dc7811ea)
Published on Sep 10, 2017 · 8 min read

### [Deep Dive into AppRun State](https://medium.com/@yiyisun/deep-dive-into-apprun-state-3d6fb58b1521)
Published on Sep 9, 2017 · 6 min read

### [Building Applications with AppRun](https://medium.com/@yiyisun/building-applications-with-apprun-d103cd461bae)

AppRun is a Javascript library for building reliable, high-performance web applications using the Elm inspired Architecture, events and components.

![](logo.png)

Published on Jul 2, 2017 · 5 min read


## Video Tutorials

* [Building Applications with AppRun, Part 1 - Getting Started](https://www.youtube.com/watch?v=RuRmXEN2-xI)
* [Building Applications with AppRun, Part 2 - Components](https://www.youtube.com/watch?v=qkP6HvZmhtY)


