import { type BehavioralDiff, type BehavioralBaseline } from '../../baseline/index.js';
/**
 * Format a diff using the requested output format.
 */
export declare function formatDiffOutput(diff: BehavioralDiff, format: string, baselinePath: string): string;
/**
 * Format check-only output when no baseline is provided.
 */
export declare function formatCheckResults(baseline: BehavioralBaseline, format: string): string | null;
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