/**
 * WebGL grid spike — batched GL_LINES renderer for axis grid lines.
 * Labels remain on Canvas 2D; this spike covers grid lines only.
 * @module renderer/spike/WebGLGridSpike
 */
export interface GridLineSpec {
    /** Plot area in CSS pixels */
    plotArea: {
        x: number;
        y: number;
        width: number;
        height: number;
    };
    /** Pixel X positions for vertical grid lines */
    xLines: number[];
    /** Pixel Y positions for horizontal grid lines */
    yLines: number[];
    /** Canvas width (physical pixels) */
    width: number;
    /** Canvas height (physical pixels) */
    height: number;
    /** Line color RGBA 0–1 */
    color?: [number, number, number, number];
    /** Line width in pixels */
    lineWidth?: number;
}
/** Build interleaved [x,y] vertex pairs for GL_LINES from tick pixel positions */
export declare function buildGridLineVertices(spec: GridLineSpec): Float32Array;
export declare class WebGLGridSpike {
    private gl;
    private program;
    private buffer;
    private aPosition;
    private uResolution;
    private uColor;
    constructor(canvas: HTMLCanvasElement);
    /** Upload vertices and draw grid lines */
    draw(spec: GridLineSpec): number;
    destroy(): void;
}