/**
 * Downsampling Web Worker
 *
 * Performs CPU-intensive downsampling off the main thread.
 *
 * Usage:
 * ```typescript
 * const worker = new Worker(new URL('./downsample.worker.ts', import.meta.url));
 *
 * worker.postMessage({
 *   type: 'downsample',
 *   x: xArray,
 *   y: yArray,
 *   targetPoints: 1000,
 *   algorithm: 'lttb'
 * });
 *
 * worker.onmessage = (e) => {
 *   const { x, y, indices } = e.data;
 *   chart.setDownsampledData(x, y);
 * };
 * ```
 */
interface DownsampleRequestMessage {
    type: 'downsample';
    id?: string;
    x: Float32Array | Float64Array;
    y: Float32Array | Float64Array;
    targetPoints: number;
    algorithm?: 'lttb' | 'minmax';
}
interface DownsampleResponseMessage {
    type: 'downsample-result';
    id?: string;
    x: Float32Array;
    y: Float32Array;
    indices: Uint32Array;
    originalLength: number;
    duration: number;
}
interface ErrorMessage {
    type: 'error';
    id?: string;
    error: string;
}
export type { DownsampleRequestMessage, DownsampleResponseMessage, ErrorMessage };