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async function fun1() {
    try {
        if(condition) {
            //your statements
        } else {
            await sleep(3000);
            //now execute your else code
        }
    } catch(err) {
        console.log('Error is: ', err);
    }
}

function sleep(duration) {
    return new Promise((resolve, reject)=> {
        setTimeout(()=> resolve('time complete'), duration);
    })
}