import type { RParseRequestFromFile, RParseRequestFromText } from '../r-bridge/retriever';
/**
 * Statistics on skipped files, the time required, and more.
 *
 * @see extractUsageStatistics
 * @see initialMetaStatistics
 */
export interface MetaStatistics {
    /**
   * The number of requests that were parsed successfully
   */
    successfulParsed: number;
    /**
   * The processing time for each request
   */
    processingTimeMs: number[];
    /**
   * All failed requests (e.g., if they can not be converted to XML)
   */
    failedRequests: (RParseRequestFromText | RParseRequestFromFile)[];
    /**
   * Number of lines with each individual line length consumed for each request
   */
    lines: number[][];
    /**
     * The number of nodes in the normalized AST
     */
    numberOfNormalizedNodes: number[];
}
/**
 * Returns an initial {@link MetaStatistics} object, using neutral defaults (like the empty list).
 */
export declare function initialMetaStatistics(): MetaStatistics;