Why is there a need for another framework? the current approach is not producing fast sites, and this problem will not disappear by waiting for a faster CPU.

Foreword

Qwik in Action

Introduction to the frontend development. Now, the responsibility of creating good or bad applications depends on you because the means available are all there.

Introduction

Overview of TypeScript. TypeScript introduced types into an untyped language like Javascript to ensure code consistency.

TypeScript

Overview of the frontend architectures. In this lesson you will understand the difference from Client Side Rendering and Multi Page Application.

Frontend architectures

Overview of the hydration. In this lesson you will understand the difference from Hydration and Island architecture/Partial Hydration.

Hydration

React Server Component. In this lesson you will understand the difference from Server Component and Client Component.

React Server Component

Qwik resumability will change the frontend ecosystem, In this lesson you will understand why is so great.

Resumability, the Qwik way

Wrap up of frontend architectures module.

Summary Chapter 2

In this lesson you will be able to understand more about performance and you will understand how improve your application with less JavaScript.

Qwik, the framework built on top of closure-extraction

Resumability is the core concept behind Qwik. In this lesson you will understand better the process.

Resumability

Code Extraction is a topic hard to master, you will understand how it works with different approaches.

Code Extraction

JSX syntax is the most famous one because of React, but what about the other frameworks, Vue, Angular?

Why Qwik use JSX syntax

Summary Chapter 3

Let's see together the fundamentals of Qwik. In this lesson you will compare Webpack and Vite.

Getting started with Qwik

The Qwik build process is so important because the resumability process requires correct and intelligent bundling.

Qwik compilation Process

Qwik CLI and amazing tool to have a great Developer Experience with Qwik.

Technical requirements to start a new Qwik application

Qwik Middleware an easy and clever way to expose your RESTful APIs or GraphQL APIs.

Middleware

Wrap up of Getting Started with Qwik module.

Summary Chapter 4

In this lesson you will learn the pillars of SEO. You will lean few new terms and metrics that can help you to measure your application.

In this lesson you will learn the some new things about SEO and crawler.

Sitemap and robots files

Partytown an amazing library to execute third scripts in the service worker.

Partytown

Core Web Vitals are so important for own application. You will learn in detail all the metrics.

Core Web Vitals

Core Web Vitals Labs Data vs Field Data. These two information are so different, let's figure out the peculiarity of those.

Labs data vs Field data

Summary Chapter 5

SEO and Core Web Vitals

There are many ways to deploy a Qwik application. You can have your own server and deploy your Qwik application easily with the Qwik CLI and integrations.

Deploy Qwik in production

Cloud solution are a good alternative for a low cost pipeline and host. Nowadays these kind of services are so smart and great, you should try them.

Cloud solutions

With different team and many developers, it's important to master branching strategies to avoid problems during your day by day.

Branching strategies

Progressive Web App approach can be an alternative to the stores. You can publish you application with a lot of benefit with PWA.

Progressive Web App

Wrap up of Deploy Qwik in Production module.

Summary Chapter 6

Style an application is so important let's see how engage your Stakeholders into this process.

Style and render data with Qwik

CSS is so huge, there are a lot of ways to style your application with Qwik, let's see them together.

CSS and Built-In Styling Methods

Tailwind is an amazing library, let's see together how master it. I will share you some tips and tricks to use Tailwind in a better way.

Tailwind CSS

In this lesson you will learn how manage data with Qwik. There are a lot of APIs to explore, let's jump into the code.

Managing data with Qwik

Summary Chapter 7

In this lesson you will learn how architect a modern frontend end application.

Creating an e-commerce with Qwik and Supabase

In this lesson you will learn the trade offs of technical decisions. I share with you some tips and tricks.

Technological spike

In this lesson you will explore Supabase. This is an amazing service to leverage your business.

Supabase for your backend

A custom authentication is too complex and risky to implement from scratch. Let's use the Supabase auth to optimize our goals.

Let's talk about the Authentication process

Summary Chapter 8

Supabase CLI an handy tool to improve consistency across environments.

Supabase CLI

Let's use the Supabase CLI to manage our database migrations and schemas.

Supabase db migrations

In this lesson you will create the e-commerce homepage with the Supabase client to read the data.

Show products on our homepage

Every e-commerce has a detail page, let's create our product detail page with Qwik.

Product Detail

Cache is really useful and in this lesson I will explain in the detail how it works. I will share my experience in this topic with some cool analogies.

Cache-control headers

Summary Chapter 9

Rendering products with Orama full text search

Let's improve out application with a useful "Add to favorites" feature.

Add a product to your favorites list

In this lesson you will learn how to use Stripe to manage your payments in a secure way.

Adding cart and checkout process with Stripe

Let's try the Supabase database function. This is an easy way to allows us to do several things and also add some logic to our procedure.

Page views tracking

A real-time database with Supabase is so simple to implement, let's build together a new functionality with this great feature.

Real-time database

Summary Chapter 10

Let's explore together the benefit of testing. In this lesson you will explore the various types of tests, Unit Test, E2E, Visual regression tests and more.

Overview of application testing

Let's discuss together how and when testing is valuable for our business. 3X Explore/Expand/Extract can help us is this reasoning.

How much testing is enough? When do I write tests?

In this lesson you will lean the Test driven development TDD flow. It's a really good practice to put in place.

Test-Driven Development (TDD)

In this lesson you will lean how test your components with Cypress.

Let's add some tests with Cypress

Do you need a Qwik component library? Qwik UI is the project for you because can give you a lot of Qwik accessible components out of the box.

Qwik UI

Summary Chapter 11

Adding tests to our Qwik application

Let's explore a bit of history of Qwik. A new framework with a great past.

Final thoughts

Qwik and React together, no problem, qwikify$ is the API to solve your problems.

qwikify$

Qwik and Astro together, no problem, @qwikdev/astro is the library to solve your problems.

Qwik inside Astro application

Qwik and micro-frontends together, no problem, out of the box Qwik can manage this scenario with no external dependencies.

Micro-frontends with Qwik

Summary chapter 12

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( the primaryDescriptionMarkdown is long - several lines, include images, as long as you want )

In this course we <headline of what we do>. <why this technology is good> but <here's how learning it is problem>. 

In <the length of these lessons> we cover <three salient points about what we cover. Your BEST points>. Its <however long it is> and comes with <these bonus features, and reasons to buy. code, etc.>

It's taught by <author name> who <credibility, reason you should listen to them>. <social proof, if you have it yet>

<then you can list other supporting stuff you want to add, anything you want here>

-------
Example:
-------

We created a free course to create your first GraphQL server (from scratch) using Node and TypeScript. TypeScript and GraphQL are a powerful combo, but there's a lot of confusing edges if you're getting it setup the first time.

In this course we cover the basics of getting TypeScript setup with Node, how GraphQL works, and how to set up a GraphQL server using Apollo server. It's two hours long, it comes with complete code examples, and we walk through the code step-by-step.

It's taught by my friend, Shopify-engineer Hassan Djirdeh and he's integrated what he's learned using GraphQL in production as an engineer at Shopify. We've already had over 1,300 students enroll and it's been getting great reviews so far.

// ... and so on

Harness Qwik Resumable Architecture for Lightning-Fast Startup Times

In this course we <headline of what we do>. <why this technology is good> but <here's how learning it is problem>. 

( the summary is short - one or two lines )

Complete Guide to Qwik

You have seen how to create Vite plugins, and in fact, behind the scenes, at the time of compilation, optimization takes place and prepares our code to be used in the Resumability architecture.
To perform this optimization, the Qwik team built 

 (stands for Speedy Web Compiler), the same technology used by 

, to perform advanced optimizations without sacrificing build times.
SWC accepts any JavaScript or TypeScript files using modern JavaScript features and outputs valid code that is supported by all major browsers; it's fast because it is Rust-based. If you were to do the same computations with JavaScript, you would run into the problem that it is single-threaded and is not a good place to do heavy computation. Additionally, the Rust and SWC communities are growing, and you can easily find support, so it's a plus.
So, 

 and applies a transformation that extracts the expression into a loadable and importable symbol.

Is there a way to see how this transformation occurs in the Vite process?
You can install a special plugin, 

 to be able to analyze what Vite does behind the scenes; this is also very useful when you are developing a new plugin because it is difficult to understand the build process without being able to see step by step what happens behind the scenes.
To activate the plugin, it is very simple; as you saw before, just add it to the configuration as follows.

import Inspect from 'vite-plugin-inspect';

export default defineConfig(() => {
  return {
    plugins: [..., Inspect()],
  };
});

 inside the dependencies array. This plugin, if not configured differently, will start when you launch the 

 process, and in addition to the application, an interactive page will also be served, usually at the address 

Let's see the component below using this plugin and try to analyze the information it provides us.

export default component$(() => {
  const handleClick = $(() => {
    console.log("handleClick");
  });
  return (
    <button onClick$={handleClick}>handleClick</button>
  );
});

 opens a panel displaying the transformation steps that have been performed.

, which is responsible for the optimizations performed by the Qwik plugin, the 

: Clicking on the icon provides a detailed analysis of how the file is optimized.

 function has been extracted on an isolated symbol.

 are single lazy-loadable pieces in Qwik; as you saw earlier, when 

 is encountered, the optimizer creates a symbol.

 are JavaScript packages that can contain one or more symbols. These packages are files loaded by the service worker under the hood and imported when needed.

This is a simple example, but let's complicate things to see how Qwik groups 

. This serves to optimize the entire Resumability process and obtain maximum performance.

Let's take this slightly more complex example.

export default component$(() => {
  const signalOne = useSignal(0);
  const signalTwo = useComputed$(() => {
    console.log("useComputed$");
    return signalOne.value * 2;
  });
  const handleClick = $(() => {
    console.log("handleClick");
    signalOne.value++;
  });
  return (
    <button onClick$={handleClick}>
      {signalOne.value} - {signalTwo.value}
    </button>
  );
});

, which are two reactive variables. Let's go into more detail about the 

 API, but for now, you just need to know that every time 

 changes automatically too.
Every time you click on the button, 

 will be changed, and, as previously explained, 

 will also be changed.
These transformations and optimizations only take place in the build phase for production, and the code that is produced is minified, which is why two console.log were added to better understand how the functions are divided in the screenshots. This way, you will be able to trace the complete tour without too much difficulty.

Let's start by analyzing the two symbols using the 

---
title: Qwik compilation Process
description: The Qwik build process is so important because the resumability process requires correct and intelligent bundling.
---

# Qwik compilation Process

You have seen how to create Vite plugins, and in fact, behind the scenes, at the time of compilation, optimization takes place and prepares our code to be used in the Resumability architecture.
To perform this optimization, the Qwik team built `Qwik Optimizer` in Rust using [SWC](https://swc.rs) (stands for Speedy Web Compiler), the same technology used by [TurboBuild](https://turbo.build/), to perform advanced optimizations without sacrificing build times.
SWC accepts any JavaScript or TypeScript files using modern JavaScript features and outputs valid code that is supported by all major browsers; it's fast because it is Rust-based. If you were to do the same computations with JavaScript, you would run into the problem that it is single-threaded and is not a good place to do heavy computation. Additionally, the Rust and SWC communities are growing, and you can easily find support, so it's a plus.
So, `Qwik Optimizer` looks for `$` and applies a transformation that extracts the expression into a loadable and importable symbol.

Is there a way to see how this transformation occurs in the Vite process?
You can install a special plugin, `vite-plugin-inspect,` to be able to analyze what Vite does behind the scenes; this is also very useful when you are developing a new plugin because it is difficult to understand the build process without being able to see step by step what happens behind the scenes.
To activate the plugin, it is very simple; as you saw before, just add it to the configuration as follows.

```typescript
import Inspect from 'vite-plugin-inspect';

export default defineConfig(() => {
  return {
    plugins: [..., Inspect()],
  };
});
```

So, activate it by adding `Inspect()` inside the dependencies array. This plugin, if not configured differently, will start when you launch the `dev` process, and in addition to the application, an interactive page will also be served, usually at the address `localhost:5173/__inspect/` to inspect the modules.

Let's see the component below using this plugin and try to analyze the information it provides us.

FILE: `./src/routes/index.tsx`

```typescript
export default component$(() => {
  const handleClick = $(() => {
    console.log("handleClick");
  });
  return (
    <button onClick$={handleClick}>handleClick</button>
  );
});
```

Here are the screens of the build steps.

![1_vite-plugin-inspect](https://d2uusema5elisf.cloudfront.net/courses/complete-guide-to-qwik/module_04/lesson_04.02/public/assets/1_vite-plugin-inspect.png)

![2_vite-plugin-inspect](https://d2uusema5elisf.cloudfront.net/courses/complete-guide-to-qwik/module_04/lesson_04.02/public/assets/2_vite-plugin-inspect_2.png)

**Step 1**: Clicking on the file `./src/routes/index.tsx` opens a panel displaying the transformation steps that have been performed.

**Step 2**: One of the steps is `vite-plugin-qwik`, which is responsible for the optimizations performed by the Qwik plugin, the `Optimizer`.

**Step 3**: Clicking on the icon provides a detailed analysis of how the file is optimized.

![3_vite-plugin-inspect](https://d2uusema5elisf.cloudfront.net/courses/complete-guide-to-qwik/module_04/lesson_04.02/public/assets/3_vite-plugin-inspect_2.png)

Here, you can see that our `handleClick` function has been extracted on an isolated symbol.

> `Symbols` are single lazy-loadable pieces in Qwik; as you saw earlier, when `$` is encountered, the optimizer creates a symbol.
> `Bundles` are JavaScript packages that can contain one or more symbols. These packages are files loaded by the service worker under the hood and imported when needed.

This is a simple example, but let's complicate things to see how Qwik groups `Symbols` into the `Bundles`. This serves to optimize the entire Resumability process and obtain maximum performance.

Let's take this slightly more complex example.

FILE: `./src/routes/index.tsx`

```typescript
export default component$(() => {
  const signalOne = useSignal(0);
  const signalTwo = useComputed$(() => {
    console.log("useComputed$");
    return signalOne.value * 2;
  });
  const handleClick = $(() => {
    console.log("handleClick");
    signalOne.value++;
  });
  return (
    <button onClick$={handleClick}>
      {signalOne.value} - {signalTwo.value}
    </button>
  );
});
```

In this example, you can see `signalOne` and `signalOne`, which are two reactive variables. Let's go into more detail about the `useSignal` and `useComputed$` API, but for now, you just need to know that every time `signalOne` changes, `signalTwo` changes automatically too.
Every time you click on the button, `signalOne` will be changed, and, as previously explained, `signalTwo` will also be changed.
These transformations and optimizations only take place in the build phase for production, and the code that is produced is minified, which is why two console.log were added to better understand how the functions are divided in the screenshots. This way, you will be able to trace the complete tour without too much difficulty.

Let's start by analyzing the two symbols using the `vite-plugin-inspect` tool seen previously.

![symbol_1](https://d2uusema5elisf.cloudfront.net/courses/complete-guide-to-qwik/module_04/lesson_04.02/public/assets/symbol_1_2.png)

![symbol_2](https://d2uusema5elisf.cloudfront.net/courses/complete-guide-to-qwik/module_04/lesson_04.02/public/assets/symbol_2_2.png)

The build process creates two constants, which are the example functions. In a previous chapter, this behavior was discussed in detail. The functions contain `useLexicalScope`, which is a function that restores the necessary variables from the closure.