TypeScript

Superset of JavaScript with more features than vanilla JS, like Types, Classes, Interfaces. Typescript need to be compiled to JavaScipt. TypeScript is a programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript and adds optional static typing to the language. It is designed for the development of large applications and transpiles to JavaScript.

What is TypeScript?

A superset of JavaScript created by Microsoft
Compiles to plain JavaScript code
Gives us a bunch of extra features
Includes many ES6 features

The browser can’t natively parse TypeScript files. So it has to be compiled to regular JS.

TypeScript features

Strong typing
Object Oriented features
Compile time errors
Object Classes
Modules – export / import
let / const scoping
Other ES6 features like arrow functions

TypeScript compiler

Written in TypeScript
Compiles .ts files to .js files
Installed with NPM
Supports ES6 Syntax
Used by Angular

Static Type Checking

Assign variable, parameter and function types
Completely optional
Helps find bugs
More descriptive code

Available Types

String
Number
Boolean
Array

Any
Void
Null
Tuple

Arrays

numberArray: number[];
stringArray: string[];
mixedArray: any[];
myTuple: [string, number, boolean];

Date & Time

publishDate?: any;

publishDate: new Date('01/02/2022 08:30:00');

Interfaces