Advanced types

TypeScript also has some advanced language features that can be used when working with basic types and objects. These features allow us to mix and match types a little more, as well as to create new types that are combinations of other types. In this section of the chapter, we will take a quick look at these advanced type features, including the following:

• Union types
• Type guards
• Type aliases
• Null and undefined
• Never and unknown
• Object rest and spread
• Tuples
• BigInt