expect-expect(browser.getTitle())错误-browser.getTitle不是函数

“TypeError:browser.getTitle不是函数。” 我到Globals.js的路径是正确的,因为如果我这样做,它就会工作- expect('Test abc').toContain('abc') . 请帮忙。

const Globals = require('../utilities/Globals');
const browser = require('protractor');
const { Given } = require('cucumber');

// Chai
const globals = new Globals();
const expect = globals.expect;


Given('I am on google page with title {string}', function (title) {
    return expect(browser.getTitle()).to.eventually.equal(title);
});

const chai = require('chai');
const chaiAsPromised = require('chai-as-promised');

class Globals {
    constructor() {
        this.expect = chai.expect;
        chai.use(chaiAsPromised);
    }
}

module.exports = Globals;