How to use promises with a unknown amount of tokens?

The following code retrieves comments from a comment section of a youtube video. The thing is it retrieves 20 comments and if there is more it retrieves a next token. I am not very experienced using promises so I wonder how can I get all comments in the section until there is no token anymore?

This code is the example code from a npm package called youtube-comment-api

I guess my question is very easy to solve, but right now I have no clue.

---

Example:

const fetchCommentPage = require('youtube-comment-api')
const videoId = 'DLzxrzFCyOs'



fetchCommentPage(videoId)
  .then(commentPage => {
    console.log(commentPage.comments)

    return fetchCommentPage(videoId, commentPage.nextPageToken)
  })
  .then(commentPage => {
    console.log(commentPage.comments)
  })

via R_Valdez