JavaScript, being a flexible scripting language along with its dynamic type system, can become harder to maintain the more a project scales up and as the team's staff changes. There are many tools and languages that can assist with this situation, one of which is TypeScript.

In this chapter, you'll become a TypeScript programmer as we cover its fundamentals:

• TypeScript compiler
• Types
• Interfaces
• Classes
• Modules
• Decorators

First, let's start with an overview of TypeScript.