How to use TypeScript with Nodejs

Typescript and Node.js have grown in popularity among programmers over the years. TypeScript is a typed superset of JavaScript. TypeScript will aid in the development process, ensuring that you are free of bugs and small errors, whereas Node.Js is an open-source server-side execution platform for JavaScript code. This tutorial will help you understand how to use TypeScript with Node.js.

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What Is TypeScript?

• TypeScript is a superset of JavaScript and is an object-oriented and tightly typed programming language. TypeScript code is transformed to JavaScript, which may be used in any environment that supports JavaScript, including browsers, Node.js, and your own applications.
• At Microsoft, Anders Hejlsberg created typeScript. TypeScript was created in response to the limitations of JavaScript for constructing large-scale applications within Microsoft and among its external customers. There was a demand for specialized tooling to make developing JavaScript components easier because of the complexity of working with complex JavaScript code.
• TypeScript is a variant of JavaScript with a few more features. TypeScript extends JavaScript with extra syntax to provide a more robust interface with your editor. TypeScript is a scripting language that understands JavaScript and relies on type inference to deliver advanced functionality without the need for additional code.

What Is Node.js?

• Node. js (Node) is an open-source server-side execution platform for JavaScript code. 
• Node is often used in real-time applications like news feeds, chats, and web push notifications because it allows for a persistent connection from the browser to the server.
• Node.js is a JavaScript runtime based on the V8 JavaScript engine from Chrome. Node.js is an asynchronous event-driven JavaScript runtime for building scalable network applications.
• Although Node.js is excellent for developing server-side apps, it lacks several current features such as type checking. It can also be difficult to manage a Node.js codebase.
• Typescript supports these current coding methods, such as static typing and type checking. It's designed to create complex and high-level applications. That's why having Typescript as the primary language for supporting Node.js capabilities would be ideal.
• This lets you develop server-side apps with rigorous type checking, avoiding runtime type errors and other Typescript benefits while maximizing Node.js' capabilities.

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Features of Node.js

• The Node.js library is extremely fast in code execution because it is built on Google Chrome's V8 JavaScript Engine.
• Node.js is an asynchronous, event-driven programming language. The Node.js library's APIs are all asynchronous or non-blocking. It means that a Node.js-based server never waits for data from an API.
• Node.js features an event looping approach with a single-threaded model. The event mechanism allows the server to reply in a non-blocking manner that increases its scalability.
• Because NodeJS is cross-platform, it may be used on many systems, including Windows, Unix, Linux, macOS X, and mobile devices.
• Node.js is a rapid data processing framework that concurrently processes and uploads a file, which saves time. As a result, NodeJs boosts data and video streaming speeds overall. Data is never buffered in a Node.js application.

Examples of TypeScript With Node.js 

In the Node.js environment, TypeScript is well-known, with numerous organizations, open-source projects, tools, and frameworks using it. The following are some significant open-source node.js projects that use TypeScript:

• NestJS - It is a comprehensive and feature-rich framework that makes building scalable, well-architected systems simple and enjoyable.
• TypeORM - Great ORM influenced by well-known utilities from other languages, such as Hibernate, Doctrine, and Entity Framework.
• Prisma - A declarative data model, automated migrations, and fully type-safe database queries feature this next-generation ORM.
• RxJS - It’s a commonly used reactive programming library.
• AdonisJS - With Node.js, building a full-featured web framework is possible.

Setting Up Development Environment

• Go to node.js official website and install node.js. After installing, enter the command “node -v” to check if the node is installed properly.

• Run npm init to produce the package.json file for Node.js. This will prompt you to ask a series of questions about your project. This instructs you on how to set up a typical Node.js project.
• Typescript dependencies are required to set up Typescript with Node.js. Run the following command to install the Typescript compiler package:

npm install -g typescript  (2)

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• The Typescript compiler will be installed worldwide with the command above. This implies that each project you create on your computer can use Typescript dependencies without reinstalling the Typescript package.
• To see if the compiler is installed, type tsc —version. (3)

• Open Visual Studio Code and Run a simple program to check

Function welcome(message) {

Return “Welcome, “ + message;

}

Let user = ‘Simplilearn’;

console.log(welcome(user));

Output: Welcome to Simplilearn

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Next Steps

Hope that this TypeScript with Node.js tutorial has provided you with a foundational grasp of TypeScript and NodeJS. Course certification will be advantageous if you learn these technologies and possibly work as a developer or programmer.

 If you wish to learn these programming languages and work as a developer or programmer, course certification will benefit you. Enroll in the Full Stack Developer - MERN Stack to learn typescript.

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