Optional Properties Not all properties of an interface may be required. Some exist under certain conditions or may not be there at all. These

Sections The guide is broken down into the following sections.

Dependencies on Global Libraries If your library depends on a global library, use a /// <reference types="..." /> directive:

Namespacing As we add more validators, we’re going to want to have some kind of organization scheme so that we can keep track of our types and

Download packages from NPM Install PackageInstaller

Accessors TypeScript supports getters/setters as a way of intercepting accesses to a member of an object. This gives you a way of having finer-grained

Array TypeScript, like JavaScript, allows you to work with arrays of values. Array types can be written in one of two ways. In the first, you

Duo

Void void is a little like the opposite of any: the absence of having any type at all. You may commonly see this as

Rest Parameters Required, optional, and default parameters all have one thing in common: they talk about one parameter at a time. Sometimes