TypeScript

What is TypeScript?

TypeScript is a programming language built by Microsoft that extends JavaScript with optional static typing. It compiles down to plain JavaScript, so it runs anywhere JavaScript runs: browsers, servers, edge functions, mobile shells. You write code with extra guarantees, and the output is the JavaScript everyone already knows.

Types let developers declare the shape of data up front. What value a variable holds, what arguments a function takes, what it returns. The compiler checks all of it at build time and catches a whole category of bugs before the code ever executes. Rename a field on one object and TypeScript flags every place that still expects the old name. On a small script the extra syntax can feel like overhead. On a large codebase touched by several people over years, it cuts bugs, makes the code easier to read, and turns risky refactors into routine ones.

It has become the default for serious JavaScript work and ships with first-class support in React, Next.js, Angular, and Node.js. When teams talk about strict mode, generics, or type inference, this is the tooling they mean.

TypeScript at Dallonses

TypeScript runs through our web development from day one. Strict mode is on across every package we maintain, so the types are doing real work rather than decorating the code. When a client's system grows and new people join, the compiler is the part of the team that never forgets how the data is supposed to flow.

This pays off most in the projects that outlive their first version. A custom web development engagement that started as a prototype often becomes the backbone of a business, and types are what let us evolve it without breaking what already works. We refactor with the compiler watching our back, ship, and move on. Clients get software that stays maintainable long after the first release.

Got a JavaScript codebase that's getting hard to change safely? Let's talk about it.

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