Why using inbuilt webdriver wait yields an error "ReferenceError: until is not defined"?

Question

Webdriverjs apparently has an inbuilt method which allows you to wait for an element.

var saveButton = driver.wait(until.elementLocated(By.xpath("//div[text() = 'Save']")), 5000);
driver.wait(until.elementIsVisible(saveButton), 5000).click();

Using this method results in an error "ReferenceError: until is not defined". Why is this method not working?

Answer 1

The most common best practice is to require webdriver.By and webdriver.until at the top of your file right after you require webdriver.

then you don't have to do webdriver.By inside your tests, you can do driver(By.css())

Answer 2

I read the webdriverjs docs and the example given there is missing 'webdriver' keyword.

var saveButton = driver.wait(webdriver.until.elementLocated(webdriver.By.xpath("//div[text() = 'Save']")), 5000);
driver.wait(until.elementIsVisible(saveButton), 5000).click();

Adding 'webdriver' keyword before 'until' and 'By' solves the issue.