import { MetricsOutput } from './types.js';
export interface StorageOptions {
    outputPath: string;
    pretty?: boolean;
}
/**
 * Write metrics to a JSON file.
 * @param metrics
 * @param options
 */
export declare const writeMetrics: (metrics: MetricsOutput, options: StorageOptions) => void;
/**
 * Read metrics from a JSON file.
 * @param inputPath
 */
export declare const readMetrics: (inputPath: string) => MetricsOutput | null;
/**
 * Resolve output path relative to project root.
 * @param fromPath
 * @param outputPath
 */
export declare const resolveOutputPath: (fromPath: string, outputPath?: string) => string;
/**
 * Merge multiple metrics outputs into one.
 * Later metrics take precedence for conflicts.
 * @param metricsList
 */
export declare const mergeMetrics: (...metricsList: MetricsOutput[]) => MetricsOutput;
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