import type { AnimationAction } from "three";
import type { AnimationStateEvent } from "./AnimationStateEvent";
/**
 * Small epsilon value used for floating-point comparisons.
 */
export declare const EPSILON = 0.000001;
/**
 * Two times PI (2π), commonly used for full circle calculations.
 */
export declare const PI2: number;
/**
 * Gets the next unique anchor index.
 * @returns The next available anchor index
 */
export declare function getNextAnchorIndex(): number;
/**
 * Animation anchor with timing and state information.
 */
export interface Anchor {
    /** The index of the anchor */
    index: number;
    /** The animation action */
    action: AnimationAction;
    /** The weight of the animation action */
    weight: number;
    /** The duration of the animation */
    duration: number;
    /** The inverse duration of the animation */
    invDuration: number;
    /** The iteration event type for this anchor */
    iterationEventType: AnimationStateEvent;
}