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TypeScript 4 Design Patterns and Best Practices 

Preface

Section 1: Getting Started with TypeScript 4

Getting Started with TypeScript 4

Until now we've discussed the basic programming constructs of TypeScript, for example, basic types such as interfaces, classes, and enums. Although you can write fully fledged programs in principle with only those types, in practice, we rely on higher-order abstractions and type utilities.

TypeScript Core Principles

Section 2: Core Design Patterns and Concepts

Creational Design Patterns

Structural design patterns are design patterns that help developers discover and implement more convenient ways to establish relationships between objects. They create abstractions to facilitate the cross-functional use of entities without introducing extra coupling. You will find that these patterns are widely used in the real world as they allow room for extensibility without sacrificing flexibility.

Structural Design Patterns

In this chapter, we will describe and analyze behavioral design patterns, which is the last category in the list of classical patterns. Behavioral design patterns try to solve the problem of assigning the precise responsibilities between objects in a way that is both decoupled and cohesive. You want to maintain the right balance between those two concepts so that the clients that interface with the objects won't have to know their internal connections.

Behavioral Design Patterns

Section 3: Advanced Concepts and Best Practices

Functional Programming with TypeScript

Reactive programming is a paradigm of computing that is concerned with how data flows through a system and how the system reacts to changes. By using this paradigm, you simplify the communication model between components and improve performance. Reactive programming has many use cases that include creating interactive user interfaces, real-time feeds, and communication tools.

Reactive Programming with TypeScript

So far in this book, we have focused on learning about the classical design patterns and expanded our exploration with functional and reactive programming methodologies. In the last two chapters of this book, we will switch gears and focus on understanding the best practices and recommendations for developing real-world TypeScript applications.

Developing Modern and Robust TypeScript Applications

Just as there are good design patterns and best practices while using TypeScript, there are some anti-patterns as well. When working on large-scale applications, you will inevitably come across some patterns or parts that look problematic, are hard to read and change, or promote dangerous behavior. This happens because as the application grows, you will need to write more code that fits the existing code base and quite often you will have to make some compromises. Over time and as more people are contributing to the same code space, you will see many inconsistencies. In this chapter, we look at approaches to work around these problems.

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