What is Typescript?

• TypeScript is a superset of JavaScript which primarily provides optional static typing, classes and interfaces. One of the big benefits is to enable IDEs to provide a richer environment for spotting common errors as you type the code.

Why Typescript?

• TypeScript supports JS libraries & API Documentation
• It is a superset of Javascript
• It is optionally typed scripting language
• TypeScript Code can be converted into plain JavaScript Code
• Better code structuring and object-oriented programming techniques
• Allows better development time tool support
• It can extend the language beyond the standard decorators, async/await

As an example:

class Greeter {
    greeting: string;
    constructor (message: string) {
        this.greeting = message;
    }
    greet() {
        return "Hello, " + this.greeting;
    }
}