What Is TypeScript, and Why Is It Worth Learning in 2025?

Front-end and back-end programming languages evolve with the emergence of new technologies (including hardware), and the preferences of the dev community are constantly changing. The popularity of a particular language does not imply that it is suitable for any task, but rather that it offers a solid resource base and a mature ecosystem, which means a constant demand for specialists in the field. This is the case with TypeScript, derived from JS, which has remained at the top of programmers’ preferences since its launch in 2012.

In the latest Stack Overflow study, Developer Survey 2024, TypeScript ranks high, both in terms of the number of users who already have experience with it or come from related technologies and want to try it, and in terms of potential salary. In this article, we will explore the main features of the TypeScript language and the reasons why it is a good choice to add it to your tech stack.

What Is TypeScript?

TypeScript is an open-source programming language developed and maintained by Microsoft. Essentially, it is a syntactic superset of JavaScript, which means that any valid JavaScript code is, in essence, also TypeScript code. The main innovation that TypeScript brings is optional static typing.

In JavaScript, variable types are dynamic, checked during runtime. This provides a degree of flexibility, but can also lead to errors that are difficult to detect in large applications. TypeScript solves this problem by allowing developers to declare data types for variables, function parameters, and return values.

These types are checked during compilation (transpilation), before the code is executed in the browser or in a Node.js environment. The compilation process transforms TypeScript code into clean JavaScript code that is compatible with any environment that runs JavaScript.

A Brief History of TypeScript

Released publicly in October 2012 after two years of internal development at Microsoft, the TypeScript project was led by Anders Hejlsberg, the principal architect of the C# language and creator of Delphi and Turbo Pascal. Its emergence was motivated by the need to build large-scale JavaScript applications, which were becoming increasingly complex and difficult to maintain. The team behind TypeScript identified that the lack of static types was a major barrier to developing enterprise-level applications with JavaScript.

Since its launch, TypeScript has been rapidly adopted by the development community, especially after the Angular team announced that it would rewrite the popular framework in TypeScript (starting with Angular 2). Today, TypeScript is one of the most loved and used languages in modern web development.

Advantages of TypeScript for Programmers

Adopting TypeScript in software projects brings a number of concrete benefits that contribute to increased productivity and higher code quality, as follows.

Error detection during development: By checking types at compile time, many common JavaScript errors (e.g., undefined is not a function) are eliminated before the code goes into production. This reduces debugging time and increases application robustness.

Superior intelligence and autocompletion in IDEs: Modern code editors, such as Visual Studio Code, WebStorm, or Sublime Text, use TypeScript type information to provide accurate code suggestions, safe refactorings, and easier navigation through the project.

Improved maintenance and scalability: In a large code base, types act as a form of documentation. By reviewing them, a new developer can quickly understand the data structure and what kind of values are expected by functions, facilitating collaboration and long-term maintenance.

Gradual adoption: As a superset of JavaScript, TypeScript can be introduced gradually into an existing project. You can start by renaming .js files to .ts and adding types as needed, without rewriting everything from scratch.

Overview

TypeScript extends JavaScript syntax with specific constructs that make it easier to write more structured and secure code.

Variables, Constants, and Types

In addition to JavaScript’s var, let, and const, TypeScript introduces type annotations.

TypeScript
let name: string = “Alex”;
let age: number = 30;
const isActive: boolean = true;

The language includes basic types such as string, number, boolean, array (e.g., number[]), tuple, any, unknown, void, null, and undefined.

Interfaces and Custom Types

You can define the structure of an object using interface or type, ensuring that objects adhere to a certain “contract.”

TypeScript
interface User {
id: number;
name: string;
email?: string; // Optional property
}

Classes

TypeScript fully implements object-oriented programming concepts. Classes can have properties, constructors, methods, access modifiers (public, private, protected), and can inherit from other classes.

Enums

Enums allow you to define a set of numeric or string-based constants, making your code more readable.

TypeScript
enum Role {
ADMIN,
EDITOR,
READER
}
let userRole: Role = Role.ADMIN;

Object Operations

TypeScript makes it easy to work with objects through structural patterns. An object is considered compatible with an interface if it has at least the properties defined by that interface. This, combined with operators such as spread (…) and destructuring, provides enormous flexibility.

Modules

As in modern JavaScript, code can be organized into modules, using import and export to share functionality between files.

Generics

Allows you to write reusable components (functions, classes, interfaces) that can work with a variety of types while maintaining type safety.

TypeScript
function firstValue<T>(arr: T[]): T {
return arr[0];
}

Equality

TypeScript, like JavaScript, has two equality operators: == (loose equality) and === (strict equality). It is recommended practice to always use ===, as it compares both value and type, preventing subtle errors.

Asynchrony

Fully supports asynchronous operations through Promises and async/await syntax, allowing you to write asynchronous code that looks and behaves like synchronous code, making it much easier to read and follow.

Why It’s Worth Knowing TypeScript in 2025 and Beyond

The technical arguments are compelling, but for many, the relevance of a programming language in the job market is the deciding factor. From this perspective, TypeScript is in an excellent position.

Competitive Salaries

The high demand for TypeScript developers, especially for mid-level and senior roles, translates directly into attractive salary packages. According to data from the devjob.ro platform in Romania, a programmer who knows TypeScript can earn an average net monthly salary of approximately 13,000 lei, with the possible salary range generally varying between 7,500 and 25,000 lei per month, net. Of course, these values vary depending on experience, city, and company, and senior developers with solid expertise can far exceed this level.

Diverse Employment Opportunities

Knowledge of TypeScript opens doors to a wide range of roles, from frontend (with frameworks such as Angular, React, or Vue.js, all of which have excellent support for TypeScript) to backend (with Node.js and frameworks such as NestJS). Large technology companies and innovative startups alike have adopted TypeScript as the standard for new projects due to its robustness and scalability benefits.

Access to the Global Remote Job Market

The pandemic has accelerated the transition to remote work, and software developers are among those who benefit most from this trend. Companies in Western Europe and North America are actively seeking talent in Romania, and knowledge of a modern and in-demand technology such as TypeScript is a major competitive advantage. Salaries for remote positions are often in dollars or euros and can be significantly higher than those offered on the local market, with hourly rates ranging from $20-$30 for junior roles, reaching and exceeding $70-$80 for seniors and software architects.

In conclusion, learning TypeScript in 2025 is not only an investment in the quality of the code you write, but also a strategic choice for your career. This language provides you with a powerful set of tools to build modern and reliable applications, aligns you with market demands, and maximizes your earning potential, both in Romania and internationally. In an industry where JavaScript is ubiquitous, TypeScript is the next logical step: the power and flexibility of JavaScript, augmented with the security and structure that successful projects need.