Run async tasks sequentally and with delay while without blocking event-loop

index.js

async function getNumber(number) {
    return number
}

let tasks = [
    () => getNumber(1),
    () => getNumber(2),
    () => getNumber(3),
    () => getNumber(4)
];

(async function () {

    tasks = tasks.map(task => () => new Promise(resolve => {
        setTimeout(async () => {
            resolve(await task())
        }, 3000);
    }))

    let seconds = 0

    setInterval(() => {
        console.log('seconds', seconds++)
    }, 1000);

    for (let task of tasks) {
        console.log(await task())
    }
})();