TypeScript Tutorial

JavaScript with types TypeScript is a superset of JavaScript that adds optional static types . Every valid JavaScript file is already valid TypeScript; you opt into types where ...

Install and compile For a project, generate a config file with tsc --init ; it creates tsconfig.json where you set the target JS version, strictness and output folder. Then just ...

Describing an object An interface defines the shape an object must have. Functions that take that interface only accept matching objects: Optional and read-only members A ? makes ...

Typing functions A ? after a parameter name makes it optional; a default value both provides a fallback and makes the parameter optional. Why generics Without generics you either ...

Classes with typed members Access modifiers TypeScript adds public (default), private and protected to control visibility. A shorthand lets the constructor declare and assign ...

Modules: import and export Each file is a module. Export what other files may use, and import it by path: A default export is imported without braces; named exports use braces. ...