To get the most out of this book

In general, the requirements to run most of the code are minimal. A computer that is capable of handling Chrome, Node.js, and a C compiler is needed. The C compiler that we will be utilizing near the end of this book will be CMake. These systems should work on all modern operating systems.

For Chrome, having the latest versions will be helpful as we will be utilizing some features that are either in the proposal stage or in ECMAScript 2020. We are using the latest LTS version of Node.js (v12.16.1), and are avoiding the use of Node.js 13 as it won't be promoted to LTS. On top of this, the command-line tool for Windows is not that great, so it is recommended to download Cmder, from https://cmder.net/, to have a Bash-like shell for Windows.

Finally, a modern IDE or editor is needed. We will be utilizing Visual Studio Code throughout this book, but many other alternatives, such as Visual Studio, IntelliJ, Sublime Text 3, and so on, can be used.

Software/hardware covered in the book	Operating system requirements
Svelte.js v3	Windows 10/OSX/Linux
ECMAScript 2020	Windows 10/OSX/Linux
Node.js v12.16.1 LTS	Windows 10/OSX/Linux
WebAssembly	Windows 10/OSX/Linux

Download the example code files

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the Support tab.
3. Click on Code Downloads.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Hands-On-High-Performance-Web-Development-with-JavaScript. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "This is very similar to console.time and timeEnd but it should showcase what is available with generators."

A block of code is set as follows:

for(let i = 0; i < 100000; i++) {
    const j = Library.outerFun(true);
}

Any command-line input or output is written as follows:

> npm install what-the-pack

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "If we open the DevTools by pressing F12 in Windows, we may see the Shader Editor tab already."

Warnings or important notes appear like this.

Tips and tricks appear like this.