import type { AvatarDefinition } from './types/AvatarDefinition';
import type { AvatarInteractionState, AvatarPointerType } from './types/AvatarVisualDefinition';
/**
 * Internal interaction state kept between animation frames.
 *
 * @private utility of the avatar rendering system
 */
export type AvatarInteractionRuntimeState = AvatarInteractionState & {
    readonly lastFrameMs: number | null;
};
/**
 * Raw shared pointer sample used to derive one avatar-local gaze target.
 *
 * @private utility of the avatar rendering system
 */
export type AvatarPointerSnapshot = {
    readonly clientX: number;
    readonly clientY: number;
    readonly isPointerActive: boolean;
    readonly pointerType: Exclude<AvatarPointerType, 'idle'>;
};
/**
 * Avatar-local pointer target resolved from viewport coordinates.
 *
 * @private utility of the avatar rendering system
 */
export type AvatarPointerTarget = {
    readonly gazeX: number;
    readonly gazeY: number;
    readonly bodyOffsetX: number;
    readonly bodyOffsetY: number;
    readonly intensity: number;
    readonly isPointerActive: boolean;
    readonly pointerType: AvatarPointerType;
};
/**
 * Creates one stable cache key from the meaningful avatar-definition fields.
 *
 * @param avatarDefinition Normalized or raw avatar definition.
 * @returns Stable cache key that ignores object identity churn.
 *
 * @private utility of the avatar rendering system
 */
export declare function createAvatarDefinitionKey(avatarDefinition: AvatarDefinition): string;
/**
 * Returns the neutral interaction state used by static/server-side renders.
 *
 * @returns Zeroed interaction state.
 *
 * @private utility of the avatar rendering system
 */
export declare function createIdleAvatarInteractionState(): AvatarInteractionState;
/**
 * Creates a fresh runtime state for the interactive animation loop.
 *
 * @returns Runtime interaction state with neutral values.
 *
 * @private utility of the avatar rendering system
 */
export declare function createAvatarInteractionRuntimeState(): AvatarInteractionRuntimeState;
/**
 * Converts the shared viewport pointer state into one avatar-local gaze target.
 *
 * @param avatarBounds Canvas bounds in viewport coordinates.
 * @param pointerSnapshot Latest shared pointer sample.
 * @returns Local target used to steer eyes and subtle body lean.
 *
 * @private utility of the avatar rendering system
 */
export declare function resolveAvatarPointerTarget(avatarBounds: Pick<DOMRectReadOnly, 'left' | 'top' | 'width' | 'height'>, pointerSnapshot: AvatarPointerSnapshot | null): AvatarPointerTarget;
/**
 * Advances the smoothed interaction state toward the latest pointer target.
 *
 * @param runtimeState Previous animation-frame state.
 * @param pointerTarget Latest local pointer target.
 * @param nowMs Current animation-frame timestamp.
 * @returns Next runtime state to keep in the animation loop.
 *
 * @private utility of the avatar rendering system
 */
export declare function stepAvatarInteractionRuntimeState(runtimeState: AvatarInteractionRuntimeState, pointerTarget: AvatarPointerTarget, nowMs: number): AvatarInteractionRuntimeState;