If you're new to Deno, one of the best parts is that it supports TypeScript out of the box — no extra config, no bundlers, no headaches.
In this post, I'll walk you through why TypeScript is a game-changer and how Deno makes it easy to start using right away.
🧠 What is TypeScript?
TypeScript is a statically typed superset of JavaScript. It helps you write safer code by detecting bugs before your code runs. And best of all — with Deno, you don’t need a build step or tsconfig.json to get started.
✅ Why Deno + TypeScript is a Perfect Match
-
Native TypeScript support: Just use
.tsfiles and Deno handles the rest - Cleaner project setup: No need for Babel, Webpack, or tsc
- Improved tooling: Built-in formatter, linter, and test runner — all work with TS
- Secure by default: Deno runs in a sandbox unless explicitly allowed
✨ Example: Hello TypeScript in Deno
// hello.ts
function greet(name: string): string {
return `Hello, ${name}!`;
}
console.log(greet("Deno + TypeScript"));
Run it directly:
deno run hello.ts
Boom — TypeScript without any setup.
🔧 Need More Than Just One File?
Use Deno’s built-in module system:
// utils.ts
export function square(x: number): number {
return x * x;
}
and import in another file
// main.ts
import { square } from "./utils.ts";
console.log(square(4)); // 16
🔍 What’s Next?
In the next posts, I’ll cover:
- Organizing a Deno project with TypeScript
- Using third-party modules with type definitions
- Testing with Deno’s built-in test runner
- Deploying TypeScript APIs with Deno Deploy
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💡 Pro Tip: Deno’s built-in docs generator works great with TypeScript types. Try:
deno doc your_module.ts
Thanks for reading!
Follow me for more Deno + TypeScript tips.
Happy deno coding 🔧
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Let me know if you’d like a follow-up post — for example, setting up a REST API in Deno with full TypeScript types.
Top comments (1)
What do you think about details and formatting?