reflectY
Mirror a path across the X axis (negate all y coordinates).
reflectY(svgPath: string): string
svgPath — SVG path d-attribute string.
Returns — A new SVG path string mirrored vertically across y = 0.
// Mirror a shape across the X axis
const mirrored = pathRite.reflectY("M 0 10 L 50 10 L 50 60 Z");