/**
 * UFOEntranceAnimator - Handles UFO entrance animation logic
 *
 * Pure animation calculator for UFO appearance effects.
 * Extracted from UFOSystem.updateEntering() for single responsibility.
 */
import type { IUFOEntranceAnimator, EntranceAnimationInput, EntranceAnimationResult } from "../contracts/IUFOEntranceAnimator.js";
export declare class UFOEntranceAnimator implements IUFOEntranceAnimator {
    calculate(input: EntranceAnimationInput): EntranceAnimationResult;
}
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