Puppeteer Opera open newPage

index.js

operaNewPage = async function(browser) {
    const browserPages = await browser.pages();

    //count pages
    console.log((await browser.pages()).length);
    const pageCount = (await browser.pages()).length;
    const mainPage = (await browser.pages())[0];
    await mainPage.evaluate( function (){
        window.open('about:blank');
    });

    while((await browser.pages()).length === pageCount){
        //sleep
        console.log((await browser.pages()).length);
        //await exports.delay(1000);
    }
    //return last element of array
    let page = (await browser.pages())[(await browser.pages()).length - 1];
    return new Promise((resolve) => {
        resolve(page);
    });
};