After update, printJS forces styling

We recently updated printJS to 1.6, and now all the printed documents (html) get new forced inline styling from printJS:
As you can see, this new styling applies to every single html element.
Our implementation of printJS is quite simple:

`printJS({
printable: this.options.elementId,
type: 'html',
onPrintDialogClose: function () {
resolve();
}
});`

Why is this happening? How do we configure printJS to not apply any of it's own styling at all?
Thank you

EDIT: Can't tell which version were we using before the update to 1.6, but it did not applied any extra styling to printed documents.