Originally published October 2018. Updated March 2023. This article describes the features and functionality of TypeScript 5.0. One of the most interesting languages for large-scale application development is Microsoft’s TypeScript. TypeScript is unique in that it is a superset of JavaScript, but with optional types, interfaces, generics, and more.

Originally published November 2018. Updated November 2022.

This cheat sheet is an adjunct to our Definitive TypeScript Guide. Originally published November 2018.