After I read Image, I want to use canvas's drawImage.

but id does not work. when I call onload,

TypeError: a.onload is not a function

it happened.

what's wrong?

let ctx = new Image();
　ctx.onload(() => {　
　this.compositedImage.drawImage(ctx, 0, 0, ctx.width, ctx.height, 0, 0,　is.compositedCanvas.width, this.compositedCanvas.height);
　resolver(this);
}, this);

it is written in a Promise context, so is it related to this?

Please help me....