let bar = null
let fooPromise = null

const foo = () => new Promise(resolve => setTimeout(() => {
    bar = 123
    resolve(4000)
}, 5000))

const func1 = async (id) => {
    if (fooPromise === null) {
        fooPromise = foo()
    }
    console.log(id, 'is awaiting')
    // await fooPromise
    // console.log(id, bar)
    console.log(id, await fooPromise)
}

Promise.allSettled([func1(1), func1(2)]).then(() => {
    console.log('done')
    func1(3).then(() => {
        console.log('done2')
    })
})