@antv/g2/src/interaction/brushYHighlight.ts

the Grammar of Graphics in Javascript

import { BrushHighlight } from './brushHighlight';

export function brushYRegion(x, y, x1, y1, extent) {
  const [minX, , maxX] = extent;
  return [minX, y, maxX, y1];
}

export function BrushYHighlight(options) {
  return BrushHighlight({
    ...options,
    brushRegion: brushYRegion,
    selectedHandles: ['handle-n', 'handle-s'],
  });
}