declare const BASELINE_DIR: string;
export interface SaveBaselineResult {
    name: string;
    path: string;
    bytes: number;
}
export interface DiffResult {
    name: string;
    baselinePath: string;
    currentPath: string;
    diffPath: string;
    matched: boolean;
    /** Pixels that differ between baseline and current beyond the threshold. */
    mismatchedPixels: number;
    totalPixels: number;
    /** mismatchedPixels / totalPixels. Lower = more similar. 0 = identical. */
    mismatchRatio: number;
    similarity: number;
    baselineDims: {
        width: number;
        height: number;
    };
    currentDims: {
        width: number;
        height: number;
    };
    /** True when baseline + current have different dimensions (auto-fail). */
    sizeMismatch: boolean;
}
export declare function saveBaseline(currentPngPath: string, name: string): SaveBaselineResult;
export declare function diffAgainstBaseline(currentPngPath: string, name: string, opts?: {
    threshold?: number;
    diffOutputPath?: string;
}): DiffResult;
export declare function baselineExists(name: string): boolean;
export declare function listBaselines(): string[];
export { BASELINE_DIR };
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