Async TypeScript: The Complete Guide

Modern web development is unthinkable without asynchrony. API requests, working with databases, handling user events, video streaming — all of this requires a deep understanding of asynchronous patterns. The book "Async TypeScript: The Complete Guide" will take you from basic concepts to professional techniques, turning the chaos of callbacks into elegant and predictable code.

The book is intended for developers already familiar with TypeScript and JavaScript who want to systematize their knowledge of asynchrony and learn to write reliable, performant applications. You will learn how the Event Loop works in the browser and Node.js, how microtasks differ from macrotasks, and how to avoid "callback hell".

• Promises and then chains: creation, composition, Promise.all/Promise.race, exception handling in asynchronous code.
• Async/await: syntactic sugar, parallel execution, nuances of working with loops and conditional statements.
• Timers and intervals: requestAnimationFrame, setTimeout/setInterval, precise time control.
• Events and streams: EventEmitter in Node.js, working with data streams (Readable, Writable, Transform), backpressure.
• Reactive programming: basics of RxJS — Observable, Subject, operators (map, filter, debounce, switchMap).
• Parallelism and concurrency: Web Workers, worker_threads, memory sharing, Atomics, SharedArrayBuffer.
• Advanced patterns: queues, connection pools, retry strategies, Circuit Breaker, Throttle and Debounce.
• Testing asynchronous code: mocks, stubs, fake timers, testing Promises and Observables with Jest and Mocha.

Special attention is paid to practical examples and typical mistakes. You will analyze how subscriptions leak in RxJS, why you should not forget about handling reject, and how to profile asynchronous code using built-in browser and Node.js tools. Each chapter ends with exercises to reinforce the material.

By the end of the book, you will be able to confidently design asynchronous architecture, optimize data loading, create responsive interfaces, and scalable server applications. This book is your guide to the world of non-blocking code in TypeScript.