A ThumbHash-rendered low-quality placeholder of the source image as a data:image/png;base64,… URL — a ≤32px blur with the right average colour, aspect ratio and rough structure, ~400–700 bytes. Ready for <img src> or Next's blurDataURL; no client-side decoder needed.
const lqip = await Bun.file("hero.jpg").image().placeholder();
// "data:image/png;base64,iVBORw0KGgoAAAANSUhE…"