/**
 * Pure, worklet-safe helpers for dragging a Form-A reference line along the
 * Y-axis. Kept free of hooks / SharedValues so they unit-test without Reanimated
 * (the gesture wiring lives in {@link useReferenceDrag}).
 */
/** Clamp a value to an optional `[min, max]` bound (order-independent). No-op when
 *  `bounds` is omitted. */
export declare function clampToBounds(value: number, bounds?: [number, number]): number;
/**
 * Index of the draggable line whose handle-Y is nearest the touch `y`, within
 * `slop` px — or `-1` when none is in reach. `handleYs` is index-aligned with the
 * chart's `referenceLines`; entries `< 0` (not draggable / off-screen / not laid
 * out) are skipped. Ties favor the later (topmost-drawn) line.
 */
export declare function nearestDraggableIndex(handleYs: number[], y: number, slop: number): number;
/**
 * Resolve a grabbed line's drag intent from the touch travel (px) since the grab.
 * Once a line is grabbed it **owns** the touch: any drag past `threshold` px in
 * either axis activates the drag. We deliberately don't fall through to scrub on
 * horizontal / diagonal intent — that let the scrub crosshair win the race even
 * on a vertical drag started on the line (#163). Returns `"activate"` past the
 * threshold, else `"wait"` (keep the gesture armed for more travel).
 */
export declare function resolveDragIntent(dx: number, dy: number, threshold: number): "activate" | "wait";
/**
 * Whether a line's value sits **outside** its watched interval — the trigger for
 * `onDragOut` / `onDragIn` (edge-detected by the caller). When `bounds` is set the
 * watched interval is `bounds` (at-or-past a bound counts as out, since the drag
 * clamps there); otherwise it's the visible `[min, max]` Y-range (out = scrolled /
 * dragged off-screen).
 */
export declare function referenceValueOut(value: number, min: number, max: number, bounds?: [number, number]): boolean;
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