Yoon H. Typescript Mini Reference 2023. A Quick Guide

Textbook in PDF format

Typescript is a better JavaScript, It is a statically typed, safe programming language, which uses more or less the same syntax as JavaScript. Typescript programs are compiled to JavaScript, and they can be run anywhere JavaScript is supported. It is widely used by professional JavaScript developers, for frontend development (e.g., Angular, React, and VueJS) as well as for backend development (e.g., Node.Js and Deno). This book is a "mini" language reference on the Typescript programming language. We go through all essential features of Typescript (as of versions 4.8 and 4.9), and some new ECMAScript features, in this book. Although it is written as a reference, however, you can read it more or less from beginning to end and you should be able to get the overall picture of the Typescript language if you have some prior experience with programming in Typescript or modern JavaScript (ES2015 and later).
The book covers:
Typescript development basics.
ES module system.
Basic JS/TS types. Type annotations.
Variable declarations. Type inference.
Algebraic data types. Generics.
Objects. Classes.
Function types. Arrow functions.
How to create new types from existing types