/**
 * Prepare Heatmap data for WebGL rendering
 * Creates a mesh of triangles for the grid.
 *
 * @param x - X coordinates of grid columns
 * @param y - Y coordinates of grid rows
 * @param z - Z values (matrix flattened in row-major order: width=x.length, height=y.length)
 * @returns Interleaved data [x, y, value, ...] ready for gl.TRIANGLES
 */
export declare function interleaveHeatmapData(x: Float32Array | Float64Array | number[], y: Float32Array | Float64Array | number[], z: Float32Array | Float64Array | number[]): Float32Array;
/**
 * Generates a colormap texture data
 * Viridis approximation
 */
export declare function getColormap(name?: string): Uint8Array;