Visual studio code not autocompleting my javascript methods

I am writing automated tests for a webshop using Visual studio Code, webdriverIO and javascript/nodeJS

Everything works fine, but I can't seem to get vs code to autocomplete my methods (I am using a page object model, pageobjects which contain methods are called in tests).

This is my login pageobject with a method to login a user (just an example, actual pageobject contains many more methods) :

class LoginPage{

    login(username, password) {
        browser.setValue('#ShopLoginForm_Login', username)
        browser.setValue('#ShopLoginForm_Password', password)
        browser.click('button=Login')
  }
}

module.exports = { LoginPage };

This is how I call it in the testfile:

describe('login test', function() {

    const LoginPage = require('../../pages/loginPage').LoginPage;
    loginPage = new LoginPage
    const Menu = require('../../pages/menu').Menu;
    menu = new Menu

    it('should be able to login with valid credentials', function () {
        browser.url(url)
        menu.gotoLoginPage()
        loginPage.login(username, password)
    });
});

Every time I want to call a method in a test, it does not autocomplete the methods name, forcing me to write it out full, leading to many unneccesary typo's. Other types of methods, like webdriverIO browser.click, are autocompleted just fine.

I have tried the same code in webstorm, and there autocomplete does work.

Does anyone know what I can do to get VS code to autocomplete my methods?