run java script in R

I'm trying to use R to run javascript from a webpage. and create internal variables in R. I could do this with web drivers like selenium but I want to this with javascript engine v8 from inside R instead of from a browser instance. However, I cannot create a window object in the V8 engine. Here is my code to read and evaluate javascript in a page:

library('rvest')
library("V8")
library("dplyr")
url <- 'https://google.com'
webpage        <- read_html(url)
script         <- html_nodes(webpage,'script') %>% html_text %>% paste(collapse = "\r\n")
ct <- v8()
ct$eval(src = script)

in javascript code, they referred to internal dom objects like document, body and etc. which I don't care about them, but I cannot run the rest of the code; I'm getting error like ReferenceError: the document is not defined. is there any way to create a dummy window object in V8 engine independent from the browser? or even better determine to skip any line than you cannot execute?