TypeScript is JavaScript with syntax for types. TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.

Find TypeScript starter projects: from Angular to React or Node.js and CLIs.

Download TypeScript TypeScript can be installed through three installation routes depending on how you intend to use it: an npm module, a NuGet package or a Visual Studio Extension. If you are using …

The Handbook The TypeScript Handbook is intended to be a comprehensive document that explains TypeScript to everyday programmers. You can read the handbook by going from top to bottom in the …

TypeScript Documentation Get Started Quick introductions based on your background or preference. 面向编程初学者的 TS 为 JS 程序员准备的 TypeScript TS for Java/C# Programmers TS for Functional …

TypeScript stands in an unusual relationship to JavaScript. TypeScript offers all of JavaScript’s features, and an additional layer on top of these: TypeScript’s type system. For example, JavaScript provides …

The relationship between TypeScript (TS) and JavaScript (JS) is rather unique among modern programming languages, so learning more about this relationship will help you understand how …

TypeScript takes tooling seriously, and that goes beyond completions and errors as you type. An editor that supports TypeScript can deliver “quick fixes” to automatically fix errors, refactorings to easily re …

TypeScript has a structural type system, so when comparing two types, e.g. to see if a Producer<Cat> can be used where a Producer<Animal> is expected, the usual algorithm would be structurally …

Narrowing How TypeScript infers types based on runtime behavior Variable Declarations How to create and type JavaScript variables TypeScript in 5 minutes An overview of building a TypeScript web app …