What Is TypeScript: Introduction to Features and Advantages of TypeScript

Complete beginner guide for typescript learning

In today’s evolving world of web development, understanding the benefits of TypeScript has become increasingly important. As a powerful and popular superset of JavaScript, TypeScript offers developers the ability to leverage advanced features and capabilities, making it a valuable tool for modern software projects. This article will explore what is TypeScript, its key features, and its advantages over traditional JavaScript, providing insight into why you should consider using it for your next project.

What Is TypeScript?

As a popular statically typed superset of JavaScript, TypeScript has been gaining momentum among developers who wonder what is TypeScript and how it can improve code quality and maintainability. Developed by Microsoft in 2012, TypeScript extends JavaScript by adding optional static types, which help catch errors during development and provide better tooling support for editors and IDEs. By incorporating type annotations, developers can easily understand how their code is expected to behave, reducing the likelihood of runtime errors. In essence, TypeScript bridges the gap between JavaScript’s dynamic nature and the need for robust, scalable code, making it a go-to choice for large-scale applications.

TypeScript Components

The core components of TypeScript include the language itself, the compiler, and the language services. TypeScript language extends JavaScript by adding syntax for type declarations and annotations. The TypeScript compiler, tsc, is responsible for transforming TypeScript code into JavaScript, ensuring it follows the defined types. Lastly, the language services provide editor support, enabling features like autocompletion, refactoring, and error detection, ultimately enhancing developers’ productivity and code quality.

TypeScript Features

TypeScript offers a plethora of features that cater to developers’ needs and address some of the limitations in JavaScript. 

  1. One of the most significant advantages of TypeScript is its strong typing system. By adding optional static types, TypeScript allows for type-checking at compile time, catching potential errors before they occur during runtime.
  2. Another notable feature is TypeScript’s support for interfaces, which enables developers to define the shape of an object, ensuring that it adheres to a specific structure. This structural typing system promotes code reusability and enforces contracts between different parts of an application.
  3. TypeScript also supports classes and inheritance, allowing developers to easily write object-oriented code. This feature makes it simpler to create complex applications by encapsulating functionality in modular components.
  4. Additionally, TypeScript introduces namespaces and modules to manage code organization better. With these features, developers can avoid naming conflicts and maintain a clean, organized codebase.
  5. TypeScript’s compatibility with existing JavaScript code is another essential feature. Since TypeScript is a superset of JavaScript, any valid JavaScript code is also valid TypeScript code, making it easy to migrate existing projects incrementally.
  6. Lastly, TypeScript comes with a vast ecosystem of libraries and tools. Developers can leverage type definitions for popular JavaScript libraries, further enhancing the advantages of TypeScript.

Why Use TypeScript?

The question of “Why use TypeScript?” is common, especially among developers familiar with JavaScript. TypeScript offers numerous benefits, making it an attractive choice for building scalable and maintainable applications. With a better understanding of what is TypeScript used for, it’s easy to see why many developers choose it over JavaScript.

Use typescript over javascript

Ease of integration is one reason, as TypeScript offers seamless compatibility with existing JavaScript libraries and frameworks. This makes TypeScript a versatile choice for a wide range of applications, allowing developers to incorporate TypeScript into their projects without having to rewrite large portions of their codebase.

Improved development experience is another aspect. TypeScript provides better tooling and support for code editors and IDEs through features like autocompletion, error detection, and refactoring support, enabling developers to work more efficiently and accurately.

Incremental adoption is also important, as TypeScript allows developers to convert their codebase at their own pace. This flexibility enables teams to gradually transition from JavaScript to TypeScript, minimizing potential disruptions to their workflow.

Lastly, TypeScript is an open-source project with strong backing from Microsoft and the development community at large. This support ensures continuous improvements and updates, keeping TypeScript relevant and reliable for current and future projects.

With these factors in mind, it’s clear that TypeScript offers several compelling reasons for developers to consider it as a powerful alternative to JavaScript, providing a more robust and maintainable foundation for web development projects.

Advantages of TypeScript

Some advantages of TypeScript include:

  • Improved code quality: Static typing helps catch errors during development, leading to fewer runtime errors and increased reliability.
  • Better tooling support: IDEs and editors can provide better suggestions, auto-completion, and refactoring options, improving the overall development experience.
  • Enhanced readability: Type annotations make it easier to understand the code’s intended behavior, allowing developers to more effectively review and maintain the codebase.
  • Scalability: TypeScript is well-suited for large-scale applications due to its maintainability and robustness, offering a solid foundation for growing projects.
  • Easier collaboration: A self-documenting codebase simplifies collaboration among team members, making it more efficient for developers to work together.
  • Interoperability: TypeScript can work seamlessly with existing JavaScript code, allowing gradual adoption without requiring a complete rewrite of existing codebases.
  • Strong community and ecosystem: TypeScript is supported by a vibrant community, with a wealth of resources, tools, and third-party libraries available to help developers maximize their productivity.

Disadvantages of TypeScript

Some disadvantages of TypeScript include:

  • Longer compilation time: TypeScript requires compilation to JavaScript, which can slow down development.
  • Learning curve: Developers need to learn TypeScript’s syntax and typing system, which can be challenging for those new to static typing.
  • Limited third-party library support: Some libraries may lack TypeScript definition files, leading to manual type definition work.
Developers use JavaScript frameworks to create applications

What’s the Difference Between TypeScript and JavaScript?

As you explore what is TypeScript, it’s essential to understand the difference between TypeScript and JavaScript, the language it’s built upon. TypeScript is a statically typed superset of JavaScript, which means it extends the capabilities of JavaScript by introducing optional static types. These static types help developers catch potential errors during development rather than at runtime.

In contrast, JavaScript is a dynamically typed language, meaning variables can change types during runtime. This flexibility can lead to runtime errors and make maintaining and scaling large applications challenging. TypeScript aims to address these issues by offering static types, which provide better tooling and support for code editors and IDEs.

Another notable difference is that TypeScript needs to be transpiled into JavaScript before running in browsers, as web browsers don’t natively support TypeScript. This transpilation process converts TypeScript code into plain JavaScript, allowing it to run smoothly in any JavaScript environment.

TypeScript also comes with various features not found in JavaScript, such as interfaces, namespaces, and decorators. These features make it easier for developers to organize and maintain code, especially in large projects.

In essence, TypeScript provides several advantages over JavaScript, such as improved code maintainability, reduced likelihood of runtime errors, and additional features that make it easier to develop large-scale applications. So when considering what is TypeScript used for, it’s clear that it offers a more robust alternative to JavaScript for developers who want to build scalable and reliable applications. However, it’s important to note that TypeScript is just one of the languages that compile to JavaScript, and developers should choose the best option based on their project requirements and preferences.

How Does TypeScript Fill in JavaScript Gaps?

By understanding what is TypeScript, you’ll quickly see how it effectively fills in some of the gaps in JavaScript by providing features that enhance the development process:

  1. Static typing: TypeScript’s static typing helps catch errors during development instead of at runtime, improving code reliability and maintainability. This addresses a common concern in JavaScript applications.
  2. Better tooling support: TypeScript offers enhanced tooling support, making it easier to navigate, refactor, and debug code in editors and IDEs.
  3. Advanced features: TypeScript introduces advanced features not found in JavaScript, such as interfaces, namespaces, and decorators, allowing for more organized and scalable code.

By addressing these gaps in JavaScript, TypeScript has become a popular choice for developers seeking more robust languages that compile to JavaScript. Through its static typing, better tooling support, and advanced features, TypeScript empowers developers to create more maintainable and reliable applications.

ECMAScript and TypeScript: Differences and Functions

ECMAScript and TypeScript are closely related, but they serve different functions in web development. While ECMAScript is a standardized scripting language specification that defines the core features of JavaScript, TypeScript is a superset of JavaScript that adds static typing and other advanced features. As developers explore what is TypeScript, they often compare it to ECMAScript to better understand their differences and functions.

Key differences between ECMAScript and TypeScript:

  • Static typing: ECMAScript is dynamically typed, while TypeScript adds optional static typing, helping developers catch errors during development rather than at runtime.
  • Language features: TypeScript introduces additional language features not found in ECMAScript, such as interfaces, namespaces, decorators, and generics, helping developers create more scalable applications.
  • Tooling support: TypeScript offers better tooling support, making it easier to navigate, refactor, and debug code in editors and IDEs.
  • Compilation: TypeScript needs to be compiled to JavaScript before it can be executed in a browser, while ECMAScript can be run directly in most modern browsers.

TypeScript is compatible with ECMAScript standards, incorporating new ECMAScript features as they are released. This compatibility ensures that developers using TypeScript can benefit from the latest advancements in JavaScript while enjoying TypeScript’s additional functionality. Some examples of how TypeScript adopts ECMAScript features include:

  • Arrow functions: TypeScript supports ECMAScript’s arrow functions, providing a more concise way to create function expressions.
  • Template literals: TypeScript uses ECMAScript’s template literals, allowing developers to embed expressions within string literals.
  • Modules: TypeScript adopts ECMAScript’s module system, enabling better organization and management of large codebases.

All things considered, ECMAScript defines the core features of JavaScript, and TypeScript is a superset of JavaScript that adds static typing and other advanced features. By understanding the differences and functions of ECMAScript and TypeScript, developers can make informed decisions about which language best suits their specific needs and projects. Choosing TypeScript offers the advantage of leveraging ECMAScript’s core features while benefiting from TypeScript’s additional functionality, providing a more robust and maintainable codebase.

Javascript and typescript learning resources

How to Install TypeScript

Installing TypeScript is a straightforward process, making it easy for developers to start using this powerful language. To install TypeScript, simply follow these steps:

  1. Ensure that you have Node.js installed on your system. If you don’t already have it, you can download it from the official Node.js website.
  2. Open your command prompt or terminal and run the following command to install TypeScript globally: npm install -g typescript 

This command will install the latest version of TypeScript on your machine, making it available for use in your projects. Once installed, you can start using TypeScript to develop applications that compile to JavaScript, taking advantage of its many features and benefits.

How to Learn TypeScript?

There are multiple ways to learn TypeScript and understand what is TypeScript, ranging from self-education using online resources to enrolling in a comprehensive certified course. One particularly effective method is to take an online certified course through WildLearner

The free TypeScript course is designed to help you master the language, providing the essential knowledge and hands-on experience needed to excel in your projects.

WildLearner’s TypeScript course offers a structured curriculum, expert instructors, and a supportive learning environment, ensuring you gain a deep understanding of TypeScript features and best practices. In addition, the course includes practical exercises and real-world examples to help you build a strong TypeScript portfolio.

While there are alternative options like YouTube video courses and self-learning through online documentation, these methods might not provide the same level of guidance and structure as a certified course. By choosing WildLearner, you’ll not only gain access to high-quality learning materials but also have the opportunity to earn a free certification that demonstrates your proficiency in TypeScript.


To sum up, TypeScript offers significant benefits and features that make it a valuable addition to any developer’s toolkit. By grasping what is TypeScript and its features, you can make an informed decision about whether it’s the right tool for your development needs. 

To unlock these advantages and enhance your skill set, consider enrolling in WildLearner’s TypeScript course. With expert guidance and practical exercises, you’ll be well-prepared to leverage TypeScript’s power in your development projects.