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How to Build Apps with Great Startup Performance Using Qwik

In this article, we will recap the JS Drops Qwik workshop with Misko Hevery. This workshop provided an overview on Qwik, its unique features and a look at some example components. We will also address some of the questions raised at the end of the workshop.

If you want to learn more about Qwik with Misko Hevery, then please check out this presentation on This Dot Media’s YouTube Channel. Also don’t forget to subscribe to get the latest on all things web development.

Table of Contents

What is Qwik?

Qwik is a web framework that builds fast web applications with consistent performance at scale regardless of size or complexity.

To get started with Qwik, run the following command:

npm create qwik@latest

The Qwik CLI will prompt options to scaffold a starter project on your local machine.

Screenshot 2022-12-07 160054

To start the demo application, run npm start and navigate to in the browser.

Screenshot 2022-12-07 160302

How to create a Counter Component in Qwik

Create a sub-directory in the routes directory named counter and add an index.tsx file with the component definition below.

import { component$, useStore } from "";

export default component$(() => {
  const store = useStore({
    count: 0

  return (
      <div>Counter: {store.count}</div>
      <button onClick$={() => store.count++}>Increment</button>


Now navigate to and you should see the counter component rendered on the page.

Screenshot 2022-12-07 160508

Unique features of Qwik

Directory Based Routing

Qwik is a directory-based routing framework. When we initiated Qwik, it created a routes sub-directory in the src directory and added index and layout files for route matching.

The index.tsx is the base route component and the layout.tsx is the component for handling the base page layout.

The sub-directories in the route directory serve as the application’s structure for route matching with its index.tsx files as the route components. Every index.tsx file does a look up for the layout component. If it doesn’t exist in the same directory, then it moves up to the parent directory.

// layout.tsx

import { component$, Slot } from '';
import Header from '../components/header/header';

export default component$(() => {
  return (
        <Header />
          <Slot />
        <a href="" target="_blank">
          Made with ♡ by

Slots in Qwik

Qwik uses slots as a way of connecting content from the parent component to the child projection.

The parent component uses the q:slot attribute to identify the source of the projection and the element to identify the destination of the projection.

To learn more about slots, please check out the Qwik documentation.

Very little JavaScript in production

In production, Qwik starts the application with no JavaScript at startup, which makes the startup performance really fast.

To see this in action, open the browser’s dev tools, click on the Network tab, and on the Filter tab select JS.

Screenshot 2022-12-07 160737

You will notice the Vite files for hot module reloading are currently the only JavaScript files served which will not be shipped to production.

Go to the filter tab and check the invert checkbox then in the filter input type select Vite.

Screenshot 2022-12-07 161025

Resumability with Qwik

Qwik applications do not require hydration to resume an application on the client. To see this in action, click on the increment button and observe the browser’s dev tools network tab. You will notice Qwik is downloading only the required amount of JavaScript needed.

The way Qwik attaches the event to the DOM and handles the state of components is that it serializes the attribute, which tells the browser where to download the event handler and its state. To learn more about serialization with Qwik, read through the Qwik documentation.

Screenshot 2022-12-07 161548

By default, the code associated with the click event will not download until the user triggers that event. On this interaction, Qwik will only download the minimum code for the event handler to work.

To learn more about Qwik events, please read through the [documentation] (

This Dot Labs is a development consultancy that is trusted by top industry companies, including Stripe, Xero, Wikimedia, Docusign, and Twilio. This Dot takes a hands-on approach by providing tailored development strategies to help you approach your most pressing challenges with clarity and confidence. Whether it's bridging the gap between business and technology or modernizing legacy systems, you’ll find a breadth of experience and knowledge you need. Check out how This Dot Labs can empower your tech journey.

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How to automatically deploy your full-stack JavaScript app with AWS CodePipeline

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