Book Image

TypeScript 4 Design Patterns and Best Practices

By : Theofanis Despoudis
Book Image

TypeScript 4 Design Patterns and Best Practices

By: Theofanis Despoudis

Overview of this book

Design patterns are critical armor for every developer to build maintainable apps. TypeScript 4 Design Patterns and Best Practices is a one-stop guide to help you learn design patterns and practices to develop scalable TypeScript applications. It will also serve as handy documentation for future maintainers. This book takes a hands-on approach to help you get up and running with the implementation of TypeScript design patterns and associated methodologies for writing testable code. You'll start by exploring the practical aspects of TypeScript 4 and its new features. The book will then take you through the traditional gang of four (GOF) design patterns in their classic and alternative form and show you how to use them in real-world development projects. Once you've got to grips with traditional design patterns, you'll advance to learning about their functional programming and reactive programming counterparts and how to couple them to deliver better and more idiomatic TypeScript code. By the end of this TypeScript book, you'll be able to efficiently recognize when and how to use the right design patterns in any practical use case and gain the confidence to work on scalable and maintainable TypeScript projects of any size.
Table of Contents (14 chapters)
1
Section 1: Getting Started with TypeScript 4
4
Section 2: Core Design Patterns and Concepts
8
Section 3: Advanced Concepts and Best Practices

Working with advanced types

Our exploration into TypeScript does not end with basic types. TypeScript offers more advanced ways to model types and you will encounter them quite often in production code. By learning what they are and how they work, you can combine them to produce more accurate transformations. Let's start by learning about some common utility types.

Using utility types

When you define the TypeScript compilation target, for example, ES5, ES6, and so on, then the compiler includes a relevant global definition file with an identical name, for example, lib.es5.d.ts or lib.es6.d.ts. Those files contain common utility types for you to use in your applications. We will now explore the most significant utilities and how to put them into practical use:

  • Record: If you want to define an object type that contains property keys taken from a specific type and values from another, you should use Record. A common use case is when you want to declare configuration...