/** Reusable buffers for {@link simplifyLinePoints}. */
export interface LineSimplifyScratch {
    keep: number[];
    stack: number[];
}
/** Allocate simplification scratch once, outside the per-frame worklet. */
export declare function makeLineSimplifyScratch(): LineSimplifyScratch;
/**
 * Simplify flat screen-space points (`[x0, y0, x1, y1, ...]`) with a bounded
 * Ramer-Douglas-Peucker pass.
 *
 * `tolerance` is the maximum removable deviation in pixels. The first and last
 * point, larger peaks/valleys, and the original point order are retained. Pass
 * distinct reusable `out` and `scratch` buffers to avoid per-frame allocation.
 * `absoluteXOffset` maps the viewport-relative X coordinates back onto a fixed
 * screen-pixel grid; live chart callers should pass `winStart * xScale` so
 * historical range membership does not change as the window advances.
 */
export declare function simplifyLinePoints(points: number[], tolerance: number, out: number[], scratch: LineSimplifyScratch, absoluteXOffset?: number): number[];
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