/**
 * CsvDataLogger.ts — CSV-backed implementation of IDataLogger.
 *
 * Writes one row per EvalResult to a dated CSV file at:
 *   <outputDir>/results-YYYY-MM-DD.csv
 *
 * Default output directory: career-vivid/eval/
 *
 * Features:
 *   - Append-safe: if the file already exists from an earlier run today, new
 *     rows are appended (so re-runs don't overwrite history).
 *   - Header auto-detection: headers are written only on file creation.
 *   - Sync write: each log() call flushes immediately (no data loss on crash).
 *   - Summary row: logSummary() appends a blank-then-summary row at the end.
 */
import type { IDataLogger } from "./IDataLogger.js";
import type { EvalResult, RunSummary } from "../types.js";
export interface CsvDataLoggerOptions {
    /**
     * Directory to write CSV files into.
     * Defaults to <repo_root>/career-vivid/eval/
     */
    outputDir?: string;
}
export declare class CsvDataLogger implements IDataLogger {
    private readonly csvPath;
    private readonly outputDir;
    private headerWritten;
    constructor(options?: CsvDataLoggerOptions);
    /** Full path to the CSV file being written to. */
    get filePath(): string;
    log(result: EvalResult): Promise<void>;
    flush(): Promise<void>;
    close(): Promise<void>;
    logSummary(summary: RunSummary): Promise<void>;
}
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