export interface AuditEvent {
    at?: string;
    requestId?: string;
    browser?: string;
    roleId?: string;
    action: string;
    result: string;
    errorCode?: string;
    latencyMs?: number;
    bytes?: number;
    digest?: string;
}
export declare class AuditSink {
    readonly dir: string;
    private readonly file;
    private readonly memory;
    degraded?: string;
    constructor(dir?: string);
    record(event: AuditEvent): Promise<void>;
    list(limit?: number): AuditEvent[];
    private prune;
}