TypeScript
TypeScript is a programming language developed by Microsoft that extends JavaScript with static typing. That means you define what type of data you expect for variables, functions, and objects — a number, text, an array, or a custom structure. The TypeScript compiler then checks whether the code matches these definitions and catches errors before the application is even run. The result is more reliable code with fewer bugs.
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The difference between TypeScript and JavaScript
JavaScript is dynamically typed — a variable can first hold a number and then text without anyone warning you. TypeScript adds a type system that catches such inconsistencies in the editor while you're still writing the code. Before deployment, TypeScript is compiled back to JavaScript, so the same code runs in the browser. You can think of it as a spell checker for programming — it doesn't stop you from doing anything, but it warns you about potential problems.
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Why we write in TypeScript at Appitect
We write all our code in TypeScript because it significantly reduces the number of bugs in production. When working on a larger project with dozens of components and API endpoints, the type system serves as living documentation — every developer immediately sees what data a component expects. Refactoring is safer because the compiler warns us about every place a change will affect. For our clients that means fewer bugs, faster development, and more reliable applications.
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TypeScript benefits in practice
The main benefits include better autocomplete in the editor (IntelliSense), automatic code documentation through type definitions, easier refactoring, and faster onboarding of new developers onto a project. TypeScript also offers modern language features such as generics, union types, and utility types, which let you write elegant and reusable code. Last but not least, a large portion of npm packages now ship with type definitions.
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When TypeScript makes sense
TypeScript pays off in practically any project larger than a simple script. For small prototypes, the added overhead of typing can slow down initial development, but as soon as the project grows and more people work on it, TypeScript pays back many times over. Large companies like Google, Microsoft, Airbnb, and Slack use TypeScript for their key products precisely because it reduces bugs and improves team productivity.
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Practical example
Imagine you have a contact form with name, email, and message fields. In TypeScript, you define a ContactForm type with the exact field types. If you then accidentally assign a number instead of text somewhere in the code, or forget a required field, the editor will warn you straight away with red underlining. You don't have to wait until a customer hits an error on the live site — TypeScript catches it during development.
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