QProxy

QProxy wraps JavaScript promises (Promises/A spec, e.x. Q) to allow you to chain arbitrary method calls before proxy is resolved.

For example, normally with the wd WebDriver library you would need to do the following:

browser.elementById("email").then(function(element) {
  element.type("[email protected]");
});

With QProxy you can do the following:

QProxy(browser).elementById("email").type("[email protected]")

Once the result of elementById is resolved the type method will actually be called with the correct arguments. The whole expression returns a promise which is resolved after both the elementById and subsequent type invocations are resolved.

With a sequential helper library such as QStep you could do the following (CoffeeScript):

browser = QProxy(wd.promiseRemote("localhost", 4444))
QStep(
  -> browser.init(browserName: "firefox")
  -> browser.get("https://www.facebook.com/")
  -> browser.elementById("email").type(credentials.email)
  -> browser.elementById("pass").type(credentials.password)
  -> browser.elementById("u_0_b").click()
)