Can't find docs on this library's objects

The Canvas API itself from HTML5 can be found on MDN, and the non-standard Canvas API is documented here. My question doesn't regard those docs (I think).

My question is, _is there an API documentation for how to use __the new objects__ provided by this library?_

I found this question on SO: https://stackoverflow.com/questions/9548074/nodejs-how-to-add-image-data-from-file-into-canvas

This particular snippet within it is concerning:

`var canvas = new Canvas( img.width, img.height )`

Where `Canvas` is defined here:

`Canvas = require('canvas');`

However, I didn't find any resource documenting this API. All I found was documentation on `Canvas.createCanvas`, and even then there is no description of what createCanvas does, what arguments it takes, and what kind of properties the function has as a javascript object.

Another API that seems to be mysterious is the `new Image()` API. I am assuming it is identical to [`Image()` defined by the HTML Living Standard (MDN)](https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/Image), but again there is no doc, not even a sentence saying that "node-canvas `Image()` = HTML living standard `Image()`"

How am I supposed to know how your implementation of `Image()` differs from say Mozilla Firefox's implementation of `Image()`?