type Level = "info" | "warn" | "error" | "debug";
export interface OperationalLogEntry {
    level: Level;
    message: string;
    fields?: Record<string, unknown>;
    timestamp: string;
}
export type OperationalLogSink = (entry: OperationalLogEntry) => void;
/** One managed sandbox daemon runs per process, so it owns one ephemeral remote sink. */
export declare function setOperationalLogSink(sink: OperationalLogSink): () => void;
export interface Logger {
    info(msg: string, fields?: Record<string, unknown>): void;
    warn(msg: string, fields?: Record<string, unknown>): void;
    error(msg: string, fields?: Record<string, unknown>): void;
    debug(msg: string, fields?: Record<string, unknown>): void;
}
export interface LogFileEntry {
    path: string;
    name: string;
    sizeBytes: number;
    mtimeMs: number;
    active: boolean;
}
export declare function formatLogLine(level: Level, msg: string, fields: Record<string, unknown> | undefined, date?: Date): string;
export declare function listDaemonLogFiles(logFile?: string): LogFileEntry[];
export declare function rotateLogIfNeeded(logFile?: string, nextBytes?: number, maxBytes?: number, keep?: number): void;
export declare const log: Logger;
export declare const LOG_FILE_PATH: string;
export {};