import { LogTransportInterface, type LogRecord } from '../../common';
/**
 * File-based log transport for CLI mode.
 *
 * Follows the npm/pip pattern: always captures full verbosity to file
 * regardless of the console log level, so users can inspect server
 * activity after the fact without console noise.
 *
 * **Log location:** `~/.frontmcp/logs/{appName}-{ISO-timestamp}.log`
 * (configurable via `FRONTMCP_LOG_DIR` or `FRONTMCP_HOME`).
 *
 * **Format:** Plain text, no ANSI colors, one record per line:
 * ```
 * [2026-04-06T12:34:56.789Z] INFO [FrontMcp.MultiAppScope] Scope ready — 3 apps
 * ```
 *
 * **Rotation:** Count-based — keeps the most recent 25 log files
 * (configurable via `FRONTMCP_LOGS_MAX`; set to 0 to disable file logging).
 */
export declare class FileLogTransportInstance extends LogTransportInterface {
    private fd;
    private readonly logDir;
    private readonly appName;
    constructor();
    /** Close the file descriptor. Call during shutdown to prevent handle leaks. */
    close(): void;
    log(rec: LogRecord): void;
    /** Remove oldest log files when count exceeds max (npm-style rotation). */
    private rotate;
}
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