Advanced TypeScript
$19.99
Minimum price
$29.99
Suggested price

Advanced TypeScript

  • English

  • PDF

  • EPUB

  • MOBI

  • WEB

About the Book

The book introduces you to the world of advanced TypeScript concepts including: compiler flags for catching more errors, generic types, and how to compose types with discriminated unions. 

After reading this book, you’ll feel more confident in your TypeScript skills. You will be able to write types that detect whole classes of possible runtime errors at compile time. Typing even the most untypeable JavaScript code will be a no brainer for you, and you’ll be fluent in TypeScript error messages.

The course is divided into five chapters. All of them have real life examples and focus on practicality. The first module is dedicated to strict typing. It discusses the most important compiler flags responsible for increasing strictness of type checking. The second module talks about one of the most confusing concepts of TypeScript, generic types. The third module is the most important one as it explains how to compose types in TypeScript and focuses on discriminated union types. The fourth module lists other advanced types available in TypeScript and explains their usefulness. Finally, the fifth module is specifically dedicated to real-life examples of using TypeScript in complex scenarios. It talks about debugging compile errors and about using TypeScript with some of the most popular libraries.

  • Share this book

  • Feedback

    You must own a copy of this Book to access the forums.

    Email the Author(s)

About the Author

Miłosz Piechocki
Miłosz Piechocki

I'm an experienced software engineer, currently working as an Engineering Manager at a SaaS company. I've been using TypeScript for the last 5 years. Previously, I wrote code in various statically typed languages, including C#, Haskell and Scala. I run a programming blog and love to share knowledge at meet-ups and conferences.

Table of Contents

  • Introduction
  • Strict Types
    • Introduction
    • No Implicit any
    • Fixing noImplicitAny Errors
    • The unknown Type
    • Strict Null Checks
    • Optionality
    • Strict Property Initialization
    • Non-Null Assertion Operator
    • Exercise in Strictness
  • Generics
    • Introduction
    • Function Types
    • Generic Functions
    • Generic Functions Example - Typing reduce
    • Generic Interfaces - OOP Perspective
    • Generic Interfaces - FP Perspective
    • Type Argument Constraints
    • Type Constructors
    • Type Argument Propagation
  • Composing Types
    • Introduction
    • Union and Intersection Types
    • Discriminated Union Types
    • Discriminated Unions in Practice
    • State Machines
    • Discriminated Unions vs Subtyping
  • Advanced Types
    • Introduction
    • Conditional Types Introduction
    • Built-in Conditional Types
    • The infer Keyword
    • Conditional Types Example - React Component Props
    • Mapped Types Introduction
    • Built-in Mapped Types
    • Type Guards
    • Custom Type Guards
    • Nominal Types
  • TypeScript in Practice
    • Introduction
    • Debugging Errors: Type Assignability
    • Debugging Errors: Narrowing Types
    • Debugging Errors: Unintuitive Error Message
    • React and TypeScript: useState Hook
    • React and TypeScript: useReducer Hook
  • Conclusion

Authors have earned$9,908,691writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.

Learn more about writing on Leanpub

The Leanpub 45-day 100% Happiness Guarantee

Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

See full terms

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses! Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks. Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. It really is that easy.

Learn more about writing on Leanpub

Top Books

  1. #1

    C++ Best Practices

    Jason Turner

    Level up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!

  2. #2

    Continuous Delivery Pipelines

    Dave Farley

    This practical handbook provides a step-by-step guide for you to get the best continuous delivery pipeline for your software.

  3. #3
  4. #4

    C++20

    Rainer Grimm

    C++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.

    The book is almost daily updated. These incremental updates ease my interaction with the proofreaders.

  5. #5

    Atomic Kotlin

    Bruce Eckel and Svetlana Isakova

    For both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!

  6. #6
  7. #7

    Ansible for DevOps

    Jeff Geerling

    Ansible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.

  8. #8

    Java OOP Done Right

    Alan Mellor

    Object Oriented Programming is still a great way to create clean, maintainable code. But only if you use it right.

    This book gives you 25 years of OO best practice, ready to use.

    You'll learn to design objects behaviour-first, use TDD to help, then confidently apply Design Patterns, SOLID principles and Refactoring to make clean, crafted code.

  9. #9

    Introducing EventStorming

    Alberto Brandolini

    The deepest tutorial and explanation about EventStorming, straight from the inventor.

  10. #10

Top Bundles

  1. #1

    Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication

    2 Books

    "Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before...
  2. #2

    CCIE Service Provider Ultimate Study Bundle

    2 Books

    Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification...
  3. #3

    Cisco CCNA 200-301 Complet

    4 Books

    Ce lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301.
  4. #4

    Modern C++ by Nicolai Josuttis

    2 Books

  5. #5

    CCDE Practical Studies (All labs)

    3 Books

    CCDE lab
  6. #6

    "The C++ Standard Library" and "Concurrency with Modern C++"

    2 Books

    Get my books "The C++ Standard Library" and "Concurrency with Modern C++" in a bundle. The first book gives you the details you should know about the C++ standard library; the second one dives deeper into concurrency with modern C++. In sum, you get more than 600 pages full of modern C++ and about 250 source files presenting the standard library...
  7. #7

    Mastering Containers

    2 Books

    Docker and Kubernetes are taking the world by storm! These books will get you up-to-speed fast! Docker Deep Dive is over 400 pages long, and covers all objectives on the Docker Certified Associate exam.The Kubernetes Book includes everything you need to get up and running with Kubernetes!
  8. #8

    Modern Management Made Easy

    3 Books

    Read all three Modern Management Made Easy books. Learn to manage yourself, lead and serve others, and lead the organization.
  9. #9

    The Future of Digital Health

    6 Books

    We put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy and how technology giants such as Amazon or Google want to conquer...
  10. #10

    Django for Beginners/APIs/Professionals

    3 Books

Publish Early, Publish Often

  • Path
  • There are many paths, but the one you're on right now on Leanpub is:
  • › Advancedtypescript

Leanpub is copyright © 2010-2021 Ruboss Technology Corp. All rights reserved.