export type RuntimeLogLevel = "debug" | "info" | "warn" | "error" | "silent";
export interface RuntimeLogRecord {
    level?: RuntimeLogLevel;
    event: string;
    [key: string]: unknown;
}
export interface RuntimeLogOptions {
    logDir?: string;
    now?: Date;
    retentionDays?: number;
    level?: RuntimeLogLevel;
}
export interface RuntimeLogWriteResult {
    written: boolean;
    path?: string;
    entry?: unknown;
}
export interface RuntimeLogCleanupResult {
    checked: number;
    deleted: number;
    retention_days: number;
}
export declare function defaultRuntimeLogDir(): string;
export declare function localDateStamp(date?: Date): string;
export declare function localTimestamp(date?: Date): string;
export declare function runtimeLogPath({ now, logDir }?: {
    now?: Date;
    logDir?: string;
}): string;
export declare function writeRuntimeLog(record: RuntimeLogRecord, options?: RuntimeLogOptions): RuntimeLogWriteResult;
export declare function cleanupRuntimeLogs({ logDir, retentionDays, now }?: {
    logDir?: string;
    retentionDays?: number;
    now?: Date;
}): RuntimeLogCleanupResult;
export declare function redactRecord(value: unknown): unknown;
export declare function redactString(value: string): string;