import type { ArtifactProtection, AudioAnalysis, NoiseAnalysis, RestorationPlan, RestorationValidation } from "../types/audio.js";
/**
 * Worst change across the bands that carried performance before processing.
 * Bands that were already noise or empty are excluded: cleaning those is the
 * whole point, and their movement is not damage.
 */
export declare function contentBandDamage(before: NoiseAnalysis, afterBands: Array<{
    lowHz: number;
    floorDb: number | null;
    spreadDb: number | null;
}>): {
    floorDropDb: number | null;
    spreadRiseDb: number | null;
};
export declare function validateRestoredAudio(options: {
    before: AudioAnalysis;
    beforeNoise: NoiseAnalysis;
    restoredPath: string;
    plan: RestorationPlan;
    artifactProtection: ArtifactProtection;
}): Promise<RestorationValidation>;
/**
 * Next plan to try when validation rejects the result.
 *
 * Ordered by what actually causes the damage: the denoise threshold first, then
 * the extra denoiser, then the reduction amount.
 */
export declare function chooseFallbackPlan(plan: RestorationPlan): RestorationPlan | null;