An async function returns Promise<T>, where T is the type of the resolved value:
async function getUser(): Promise<User> { ... }
Type API responses with interfaces so the rest of your code knows the shape of the data.
TypeScript Async & Promises
Type asynchronous code.
✍️ 3 exercises + code challenge in this lessonKey Takeaways: TypeScript Async & Promises
Mastering TypeScript Async & Promises helps you write clean and reliable TypeScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
TypeScript Async & Promises Code Example
TypeScriptinterface Product {
name: string;
price: number;
}
function fetchProduct(): Promise<Product> {
return new Promise(resolve => setTimeout(() => resolve({ name: "Laptop", price: 185000 }), 100));
}
async function main(): Promise<void> {
const p = await fetchProduct();
console.log(`${p.name}: Rs ${p.price.toLocaleString("en-US")}`);
}
main();Output
Laptop: Rs 185,000
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TypeScript Async & Promises Practice Exercises
Check what you learned in “TypeScript Async & Promises”.
/ 3 solved
Fill in the blank
Type an async function that resolves to a string.
async function load(): { return "done"; }
✓ Correct!
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Multiple choice
What does an async function return?
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Code challenge
Write async function getNumber(): Promise<number> that returns 7, then await it and log the result.
Write the code in the live editor. Your answer is checked automatically.
✓ Solved
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