Parameter 1 is not of type 'Path2D'

[markov00]

Hi, we are trying to replace the canvas npm dependency with just your mock to speedup our ci infrastructure.
I've replaced the library and I'm getting the following error:

'CanvasRenderingContext2D': parameter 1 is not of type 'Path2D'

when something like this exists in my code:

ctx.stroke(new Path2D(line));

The problem seems caused by the fact that Path2D is available in my jest environment when running the test (Path2D doesn't probably need any special os-dependent treatment and is available in the jsdom) and you, correctly, don't mock if it is present:

jest-canvas-mock/src/window.js

Line 47 in 315d56b

if (!win.Path2D) win.Path2D = Path2D;

The thing is that you check for a path2d being an instance of Your Path2D (and not the possible already available Path2D)

jest-canvas-mock/src/classes/CanvasRenderingContext2D.js

Lines 705 to 710 in 315d56b

	if (arguments.length === 2 && !(path instanceof Path2D))
	throw new TypeError(
	"Failed to execute 'drawFocusIfNeeded' on '" +
	this.constructor.name +
	"': parameter 1 is not of type 'Path2D'."
	);

[jtenner]

Yes. This is quite the predicament. I will look at this today.

[markov00]

@jtenner a similar issue happens also with the DOMMatrix as described here #85
The canvas context getTransform returns a DOMMatrix that is an instance of the internal implementation, not the one coming from the environment if present on window.