Scaling Artboards in the low level web api

What is the proper way to scale artboards when using the low level web api?

I've tried calling renderer.transform with a Mat2D with xx and yy set to 0.5 , but that had no effect.

I've tried getting the root node of my artboard and setting the scale on that, but the result is blurry.

const root = artboard.node('Root');
root.scaleX = 0.5;
root.scaleY = 0.5;
// Scaled, but blurry.

I've also tried renderer.scale(0.5, 0.5) which works even though "Property 'scale' does not exist on type 'WrappedRenderer'." The animation also appears blurry in this case.