When I crop an image with a transparent background, why does the resulting cropped image change the background color.

[moon-web75]

When I crop an image with a transparent background, why does the background color of the resulting cropped image turn black?

I want to crop image with a transparent image, means without change image background(JPEG)

[fengyuanchen]

For PNG images, use cropper.getCroppedCanvas().toDataURL('image/png') instead of cropper.getCroppedCanvas().toDataURL('image/jpeg').

[dymarchyk]

try different solutions like
canvas.toBlob(blob => { const file = new File([blob], "tmp", { type: "image/png" }); onFileReady(file); }, 'image/png' , 1);

or
const file = new File([canvas.toDataURL("image/png")], "tmp") onFileReady(file);

but result is the same. transparent background replaced with black
version is 1.6.1