Boolean The most basic datatype is the simple true/false value, which JavaScript and TypeScript call a boolean value.

Symbol.species A function valued property that is the constructor function that is used to create derived objects.

Library Structures The Library Structures guide helps

Understanding protected The protected modifier acts much like the private modifier with the exception

Exporting a declaration Any declaration (such as a variable, function, class, type alias, or interface) can be exported by adding the export

Reusable Types (Interfaces) Documentation When specifying a greeting, you must pass a

Add example code Type the following code into app.ts. function sayHello()

Downloading Getting type declarations in TypeScript 2.0 and above requires no tools apart from npm. As an example

Add a TypeScript configuration file You’ll want to bring your TypeScript files together - both the code you’ll be writing as well as any necessary

ES6 Modules TypeScript 1.5 supports ECMAScript 6 (ES6) modules. ES6 modules are effectively TypeScript external modules with a new syntax: