An example of using Q.spawn with generator and yield a request

main.coffee

Q = require("q")
request = require("request")

# add a new GET method on top of the original GET
request.qget = (uri, options) ->
    dfd = Q.defer()

    request.get uri, options, (err, response, body) ->
        if err
            dfd.reject(err)
        else
            dfd.resolve([err, response, body])

    dfd.promise

Q.spawn ->
    [err, response, body] = yield request.qget("http://google.com")
    console.log body
    console.log "done!"

console.log "You should see me first"