function olx_links() {
    return new Promise((resolve, reject) => {
        driver.get(olxUrl())
            .then(_ => driver.findElement(By.id('offers_table')))
            .then(e => e.findElements(By.className('wrap')))
            .then(e => {
                Promise.all(e.map(wrap => wrap.findElements(By.className('detailsLink')))).then(detailsLinks => {
                    Promise.all(detailsLinks).then(detailsLinksObjs => {
                        let dl = detailsLinks.flatMap(f => f)
                        let links = dl.map(l => l.getAttribute("href"))

                        Promise.all(links).then(
                            lks => {
                                resolve(lks.unique())
                            }
                        )
                    })
                })
            })
    })
}

olx_links().then(console.log)