Sleep Function

Need to pause execution in an async function? A sleep utility is a simple and powerful tool for delaying code.

export const sleep = (ms: number): Promise<void> =>
    new Promise((resolve) => setTimeout(resolve, ms));

How It Works

• setTimeout(resolve, ms) schedules the resolve after ms milliseconds.
• Wrapped in a Promise, so you can await it inside async functions.

Example

async function run() {
    console.log("Start");
    await sleep(2000);
    console.log("2 seconds later...");
}

run();

Output:

Start
(2-second delay)
2 seconds later...

Use Cases

• Throttling tasks in loops
• Simulating network delays in tests
• Waiting before retrying failed operations

Note

Don’t use sleep in synchronous code — it's async-only. Also, avoid excessive delays in production code unless it’s intentional and safe.

A tiny utility, but extremely useful in testing and async flows!