Sleeping in TypeScript

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Sleeping in TypeScript

Author：JIYIK Last Updated：2025/04/15 Views：

When implementing business logic, you often need to add a delay to a function or sleep for a while waiting for an API call.

This article will discuss different ways and concepts of sleeping threads in TypeScript.

Using blocking to sleep threads in TypeScript

Blocking can be used to wait for a period of time in a synchronous manner. The following code example demonstrates how to block a thread so that it can execute after a few seconds.

function delayBlocking(milliseconds: number){
    const timeInitial : Date = new Date();
    var timeNow : Date = new Date();
    for ( ; timeNow - timeInitial < milliseconds; ){
        timeNow = new Date();
    }
    console.log('Sleep done!');
}

console.log('Starting, will sleep for 5 secs now');
delayBlocking(5000);
console.log('Normal code execution continues now');

Output:

Starting, will sleep for 5 secs now
Sleep done!
Normal code execution continues now

The above code snippet will certainly stop execution for some time, but sometimes this is not the desired effect because the delay is so large that the whole code is blocked.

Using Promise Sleep in TypeScript

setTimeoutThe function is used to resolve after some delay Promise. This method can be chained with thenor async...await. The following code snippet shows thenthe behavior of .

function delay(milliseconds : number) {
    return new Promise(resolve => setTimeout( resolve, milliseconds));
}

console.log('Starting, will sleep for 5 secs now');
delay(5000).then(() => console.log('Normal code execution continues now') );

Using async..awaitit it can be achieved as per the following code snippet −

function delay(milliseconds : number) {
    return new Promise(resolve => setTimeout( resolve, milliseconds));
}
( async() => {
    console.log('Starting, will sleep for 5 secs now');
    await delay(5000);
    console.log('Normal code execution continues now');
})();

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