/**
 * Sub-segments each span is split into, and the vertex count a curve draw
 * asks for. Measured against canvas: 8 and 16 are indistinguishable and cost
 * the same, 4 is visibly worse.
 */
export declare const CURVE_SUBDIVISIONS = 32;
/** Cubic splines evaluated on the GPU, one instance per span. */
export declare const curveShader: (blend: string, kind?: string) => string;