@preflow/prose

Early testing phase — APIs may change before 1.0.

Line-level virtualization for documents whose wrapping can be calculated before paint.

bun add @preflow/prose

import { createProse } from "@preflow/prose";

const prose = createProse({
  count: blocks.length,
  getLineCount: (index, containerWidth) => measureLines(blocks[index], containerWidth),
  lineHeight: 22,
  blockGap: 14,
});

prose.setContainerWidth(720);
prose.setViewport(0, 600);
const lines = prose.getLines();

ProseFlow maps global line indices to blocks, supports scrollToLine, scrollToEnd, setCount, setContainerWidth, and relayout. createColumnLayout lays out intact blocks across shortest columns; it does not split blocks or perform widow/orphan typography.

React and Vue adapters are exported as useProse from @preflow/react and @preflow/vue.