/**
 * Transform statistics tracking
 *
 * Tracks per-file metrics and computes aggregate statistics including
 * timing breakdown and percentiles for consistent comparison across
 * Vite and Webpack implementations.
 *
 * @module @domscribe/transform/core/stats
 */
import type { ManifestWriterStats } from '@domscribe/manifest';
import type { FileMetrics, AggregateMetrics } from './types.js';
/**
 * Statistics tracker for transform operations
 *
 * Records per-file metrics and computes aggregate statistics
 * including timing breakdown and percentiles.
 *
 * @example
 * ```typescript
 * const stats = new TransformStats();
 *
 * // Record file metrics
 * stats.record({
 *   file: 'src/App.tsx',
 *   timings: { parseMs: 2.5, traversalMs: 0.5, ... },
 *   counts: { elementsFound: 10, elementsInjected: 10 },
 * });
 *
 * // Get aggregate statistics
 * const aggregate = stats.getAggregate();
 *
 * // Print formatted output
 * stats.print('vite-plugin', managerStats);
 * ```
 */
export declare class TransformStats {
    private static instances;
    private files;
    /**
     * Get or create a singleton TransformStats instance for a workspace.
     */
    static getInstance(workspaceRoot: string): TransformStats;
    /**
     * Record metrics for a single file transform
     */
    record(metrics: FileMetrics): void;
    /**
     * Get aggregate statistics from all recorded file metrics
     */
    getAggregate(): AggregateMetrics;
    /**
     * Get all recorded file metrics
     */
    getFileMetrics(): readonly FileMetrics[];
    /**
     * Reset all recorded metrics
     */
    reset(): void;
    /**
     * Print formatted statistics to console
     */
    print(prefix: string, writerStats?: ManifestWriterStats | null): void;
    private percentile;
    private empty;
}
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