Built-in TypeScript support

Deno natively understands TypeScript code with no compiler to configure. Start writing code in .ts files, and the runtime will work with them just fine.

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Define an interface in TypeScript

interface Person {
  name: string;
  age: number;
}

Provide a typed input to a function

function greet(person: Person) {
  return "Hello, " + person.name + "!";
}

Everything works with zero config!

console.log(greet({ name: "Alice", age: 36 }));

Run this example locally using the Deno CLI:

deno run https://docs.deno.com/examples/typescript.ts

Additional resources

TypeScript handbook