import type { AnimationItem } from 'recharts';
interface PolarBoundary {
    startAngle: number;
    endAngle: number;
    midAngle?: number;
}
/** Interpolates matched boundaries in a fixed, unwrapped angular frame.
 * Add/remove/reorder snap; no wrap normalization or radius interpolation.
 * Recharts snapshots the last rendered frame on retarget. Never match by position.
 */
export declare function interpolatePolarBoundaries<T extends PolarBoundary>(items: ReadonlyArray<AnimationItem<T>> | null, progress: number): T[];
export {};