export interface LogContext {
    readonly id: number;
    readonly uuid: string;
    readonly retention_limit: number;
}
export interface LokiLogContext extends LogContext {
    readonly orgId: string;
    readonly appId: string;
}
interface DeviceLog {
    message: string;
    timestamp: number;
    isSystem: boolean;
    isStdErr: boolean;
    serviceId?: number;
}
export interface InternalDeviceLog extends DeviceLog {
    nanoTimestamp: bigint;
}
export interface OutputDeviceLog extends DeviceLog {
    createdAt: number;
}
export interface SupervisorLog {
    message: string;
    timestamp: number;
    isSystem?: boolean;
    isStdErr?: boolean;
    serviceId?: number;
    uuid?: string;
}
export interface OldSupervisorLog {
    message: string;
    timestamp: number | string;
    is_system?: boolean;
    is_stderr?: boolean;
    image_id?: number;
}
export type Subscription = (log: OutputDeviceLog) => void;
export type HistoryOpts = {
    count: number;
    start: number;
};
export interface DeviceLogsBackend {
    history(ctx: LogContext, opts: HistoryOpts): Promise<OutputDeviceLog[]>;
    available: boolean;
    /**
     * `logs` will be mutated to empty and so must be handled synchronously
     */
    publish(ctx: LogContext, logs: InternalDeviceLog[]): Promise<any>;
    subscribe(ctx: LogContext, subscription: Subscription): void;
    unsubscribe(ctx: LogContext, subscription: Subscription): void;
}
export declare enum StreamState {
    Buffering = 0,
    Flushing = 1,
    Writable = 2,
    Saturated = 3,
    Closed = 4
}
export {};