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

We have displayed the list of products in our application and it would be nice to be able to add the ability to mark as favorite. It is a very common feature in e-commerce applications that of being able to mark a product as a favorite so that it can then be retrieved at a later time to continue with the purchase or go and repurchase it.
In the previous chapter, you may have noticed that there is a heart-shaped icon, to implement this new functionality we can use this graphic element to mark a single article as a favorite. This functionality also offers us the excuse to see together how we can write inside our tables with Supabase because up to now we have only read information, but usually in applications many more operations are performed. Usually to interact with an entity the term CRUD is used to refer to all the operations that can be performed: create, read, update, and delete.

So we are telling ourselves that to implement this functionality we must save in our database that the user has expressed his desire to save that specific product. Thinking about how to structure our database table we can simply think of creating a table with two columns, one with the user ID and one with the product ID these are the two pieces of information that are necessary to track the choices of each user. It can be implemented in a thousand ways, but I think this is the simplest for our context.

Please note that you can find the code for this module in the following Replit:

Let's create a new migration to create the table that will contain this information.

Let's write the SQL that will generate our table to contain the information we need.

create table public.favorites (
  id bigint generated by default as identity,
  user_id uuid not null,
  product_id bigint not null,
  constraint favorites_pkey primary key (id),
  constraint favorites_id_key unique (id),
  constraint favorites_product_id_fkey foreign key (product_id) references products (id)
) tablespace pg_default;

Now we can go and apply our changes to the database with the following command:

---
title: Add a product to your favorites list
description: Let's improve out application with a useful "Add to favorites" feature.
useMdx: true
code: https://gitlab.com/fullstackio/books/newline-course-apps/giorgio-boa-qwik-in-action-app/-/tree/main/module_10
---

# Add a product to your favorites list

We have displayed the list of products in our application and it would be nice to be able to add the ability to mark as favorite. It is a very common feature in e-commerce applications that of being able to mark a product as a favorite so that it can then be retrieved at a later time to continue with the purchase or go and repurchase it.
In the previous chapter, you may have noticed that there is a heart-shaped icon, to implement this new functionality we can use this graphic element to mark a single article as a favorite. This functionality also offers us the excuse to see together how we can write inside our tables with Supabase because up to now we have only read information, but usually in applications many more operations are performed. Usually to interact with an entity the term CRUD is used to refer to all the operations that can be performed: create, read, update, and delete.

So we are telling ourselves that to implement this functionality we must save in our database that the user has expressed his desire to save that specific product. Thinking about how to structure our database table we can simply think of creating a table with two columns, one with the user ID and one with the product ID these are the two pieces of information that are necessary to track the choices of each user. It can be implemented in a thousand ways, but I think this is the simplest for our context.

Please note that you can find the code for this module in the following Replit:

<ReplitEmbed src="https://replit.com/@newlineauthors/module10" />

Let's create a new migration to create the table that will contain this information.

```shell
pnpm supabase migration new favorites
```

Let's write the SQL that will generate our table to contain the information we need.

```SQL
create table public.favorites (
  id bigint generated by default as identity,
  user_id uuid not null,
  product_id bigint not null,
  constraint favorites_pkey primary key (id),
  constraint favorites_id_key unique (id),
  constraint favorites_product_id_fkey foreign key (product_id) references products (id)
) tablespace pg_default;
```

Now we can go and apply our changes to the database with the following command:

```shell
pnpm supabase db reset
```

Once the changes have been applied we can modify the code in our application as follows. First of all, we have to modify the products on our homepage to insert a link that allows us to reach the detail directly. Here it will be enough to modify the image of our products to accept the user's click and consequently redirect the user to the product detail page.

FILE: `src/routes/index.tsx`

```tsx
export type Product = {
  id: number;
  [...]
  slug: string; // <- We need to add the slug property
};

export default component$(() => {
  return (
    <div class='...'>
      <div class='...'>
        {resultsSig.value.map((product) => (
          <div key={product.id}>
            [...]
            <img
              loading='eager'
              width={280}
              height={280}
              class='...'
              src={`/images/${product.image}`}
              alt={product.name}
              onClick$={() => {
                navigate(`/detail/${product.slug}`);
              }}
            />
            [...]
          </div>
        ))}
        [...]
      </div>
    </div>
  );
});
```

Here we see that we have added the `slug` property to our Product type so that we can use it in our component. We have added the `onClick$` event to the image so when the user clicks on the image he will be able to go and see the detail.
Precisely on this detail page, we will add the logic to show or not whether the product is among our favorites. But first let's modify the icon to be able to assume the two states, when it is active or not.

FILE: `src/components/HeartIcon/index.tsx`

```tsx
type Props = {
  active: boolean;
  onClick$?: PropFunction<() => void>;
};

export const HeartIcon = component$<Props>(
  ({ active, onClick$ }) => {
    return (
      <svg
        xmlns="http://www.w3.org/2000/svg"
        class="h-6 w-6 flex-shrink-0"
        fill={active ? "red" : "none"}
        viewBox="0 0 24 24"
        stroke="currentColor"
        stroke-width="2"
        onClick$={() => {
          onClick$ && onClick$();
        }}
      >
        <path
          stroke-linecap="round"
          stroke-linejoin="round"
          d="..."
        />
      </svg>
    );
  }
);
```

Here we have an additional property `active`, in fact now we can go and set whether we want the icon active or not. Furthermore, we have defined the `onClick$` event to manage the user's click and change the status. This prepares the ground for modifying the product detail page.

FILE: `src/routes/detail/[slug]/index.tsx`

```tsx
import type { PostgrestSingleResponse } from "@supabase/supabase-js";
import { HeartIcon } from "~/components/HeartIcon";
import { IconShoppingCart } from "~/components/IconShoppingCart";
import type { Product } from "~/routes";
import { useUser } from "~/routes/layout";
import { supabaseClient } from "~/utils/supabase";