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typescript

TypeScript is a language for application scale JavaScript development


Version published
Maintainers
8
Weekly downloads
52,727,522
increased by5.91%

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Package description

What is typescript?

The TypeScript npm package is a superset of JavaScript that compiles to clean JavaScript output. It adds optional static typing to JavaScript, which can help with the development of large-scale applications and lead to more robust code. TypeScript is designed for the development of large applications and transcompiles to JavaScript.

What are typescript's main functionalities?

Static Type Checking

TypeScript allows you to define types for your variables and function parameters, which helps catch errors at compile time rather than at runtime.

let isDone: boolean = false;

Classes and Interfaces

TypeScript supports modern JavaScript features like classes and interfaces, allowing for more structured and maintainable code.

class Animal {
  name: string;
  constructor(theName: string) { this.name = theName; }
  move(distanceInMeters: number = 0) {
    console.log(`${this.name} moved ${distanceInMeters}m.`);
  }
}

Modules

TypeScript provides support for modules, enabling you to organize your code into separate files and manage dependencies more effectively.

import { ZipCodeValidator } from './ZipCodeValidator';
let myValidator = new ZipCodeValidator();

Generics

Generics enable you to create reusable components that work with a variety of types rather than a single one.

function identity<T>(arg: T): T {
  return arg;
}

Advanced Types

TypeScript offers advanced types like intersection types, union types, and mapped types, which provide powerful ways to work with your data structures.

type Tree<T> = {
  value: T;
  left: Tree<T>;
  right: Tree<T>;
};

Tooling Support

TypeScript integrates with many editors and provides features like autocompletion, type checking, and source navigation, enhancing the development experience.

n/a

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Source

TypeScript

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TypeScript is a language for application-scale JavaScript. TypeScript adds optional types to JavaScript that support tools for large-scale JavaScript applications for any browser, for any host, on any OS. TypeScript compiles to readable, standards-based JavaScript. Try it out at the playground, and stay up to date via our blog and Twitter account.

Find others who are using TypeScript at our community page.

Installing

For the latest stable version:

npm install -D typescript

For our nightly builds:

npm install -D typescript@next

Contribute

There are many ways to contribute to TypeScript.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Documentation

Roadmap

For details on our planned features and future direction, please refer to our roadmap.

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Last updated on 10 Apr 2024

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