/**
 * One quad per line segment instance, with the coverage of the segment computed
 * analytically. Dashes, dashed rect borders, diagonal rules, shape outlines and
 * line segments all come through here.
 *
 * Each end carries how it finishes: a flat cut, a round cap, or a join, as the
 * outward bisector of the corner and how far along it the outer corner reaches.
 * Both segments at a vertex get the same bisector and keep opposite sides of
 * it, so their union is the joined outline with no overlap between them.
 */
export declare const slineShader: (blend: string) => string;