Unable to pass page object to a function in another file.

I have a file index.js where i have initialized the browser as below :

(async () => {
    const browser = await _driver.launch
    (
        {
            headless: false,
            args: ['--start-maximized']
        }
    );
    var page = await browser.newPage();
    await page.setViewport({'width': 1366, 'height': 768 });    
    await page.goto('https://www.example.com/');
})();

Now i have another file homepage.js which contains the methods for manipulations on the homepage. This file used the page object initialized in index.js file. Im trying to pass the page object to the function of homepage.js bt it gives me UnhandledPromiseejectionWarning.

[vsemozhetbyt]

Something like this? index.js:

'use strict';

const _driver = require('puppeteer');

module.exports = async () => {
  const browser = await _driver.launch({
    headless: false,
    args: ['--start-maximized']
  });
  var page = await browser.newPage();
  await page.setViewport({ 'width': 1366, 'height': 768 });
  await page.goto('https://www.example.com/');
  return page;
};

homepage.js:

'use strict';

const getPage = require('./index.js');

(async function main() {
  try {
    const page = await getPage();
    console.log(await page.evaluate(() => document.title));
  } catch (err) {
    console.error(err);
  }
})();

Output:

Example Domain

[vsemozhetbyt]

index.js:

'use strict';

const puppeteer = require('puppeteer');
const pUtils = require('./puppeteer-utils.js');

(async function main() {
  try {
    const browser = await puppeteer.launch();
    const [page] = await browser.pages();

    await page.goto('https://example.org/');

    console.log(await pUtils.getLocation(page));
    console.log(await pUtils.getTitle(page));

    await browser.close();
  } catch (err) {
    console.error(err);
  }
})();

puppeteer-utils.js:

'use strict';

async function getLocation(page) {
  const location = await page.evaluate(() => document.location.href);
  return `Document location is "${location}".`;
}

async function getTitle(page) {
  const title = await page.evaluate(() => document.title);
  return `Document title is "${title}".`;
}

module.exports = {
  getLocation,
  getTitle,
};

Output:

Document location is "https://example.org/".
Document title is "Example Domain".