export type QoS = 0 | 1 | 2;
export type ProtocolVersion = 3 | 4 | 5;
export type ProtocolId = 'MQTT' | 'MQIsdp';
export declare function checkQoS(qos: number, error?: string): QoS;
export declare function checkProtocolVersion(version: number): ProtocolVersion;
export declare function checkProtocolId(id: string): ProtocolId;
export declare type PacketCmd = 'auth' | 'connack' | 'connect' | 'disconnect' | 'pingreq' | 'pingresp' | 'puback' | 'pubcomp' | 'publish' | 'pubrel' | 'pubrec' | 'suback' | 'subscribe' | 'unsuback' | 'unsubscribe';
export type UserProperties = {
    [index: string]: string | string[];
};
export interface IPacket {
    cmd: PacketCmd;
    messageId?: number;
    length?: number;
}
export interface IConnectPacket extends IPacket {
    cmd: 'connect';
    clientId: string;
    protocolVersion?: ProtocolVersion;
    protocolId?: ProtocolId;
    clean?: boolean;
    keepalive?: number;
    username?: string;
    password?: Uint8Array;
    will?: {
        topic?: string;
        payload?: Uint8Array;
        retain?: boolean;
        qos?: QoS;
    };
}
export interface IConnackPacket extends IPacket {
    cmd: 'connack';
    sessionPresent?: boolean;
    returnCode?: number;
}
export interface IDisconnectPacket extends IPacket {
    cmd: 'disconnect';
}
export interface IPingreqPacket extends IPacket {
    cmd: 'pingreq';
}
export interface IPingrespPacket extends IPacket {
    cmd: 'pingresp';
}
export interface IPubackPacket extends IPacket {
    cmd: 'puback';
    messageId: number;
}
export interface IPubcompPacket extends IPacket {
    cmd: 'pubcomp';
    messageId: number;
}
export interface PublishOptions {
    qos?: QoS;
    dup?: boolean;
    retain?: boolean;
}
export interface IPublishPacket extends PublishOptions, IPacket {
    cmd: 'publish';
    messageId?: number;
    topic: string;
    payload: Uint8Array;
}
export interface IPubrecPacket extends IPacket {
    cmd: 'pubrec';
    messageId: number;
}
export interface IPubrelPacket extends IPacket {
    cmd: 'pubrel';
    messageId: number;
}
export interface ISubackPacket extends IPacket {
    cmd: 'suback';
    messageId: number;
    granted: number[];
}
export interface ISubscription {
    topic: string;
    qos: QoS;
}
export interface ISubscribePacket extends IPacket {
    cmd: 'subscribe';
    messageId: number;
    subscriptions: ISubscription[];
}
export interface IUnsubackPacket extends IPacket {
    cmd: 'unsuback';
    messageId: number;
}
export interface IUnsubscribePacket extends IPacket {
    cmd: 'unsubscribe';
    messageId: number;
    unsubscriptions: string[];
}
export interface PacketOptions {
    protocolVersion: ProtocolVersion;
}
export declare function encodeUint8Array(bytes: Uint8Array): number[];
export declare function decodeUint8Array(buffer: Uint8Array, startIndex: number): Uint8Array | undefined;
export declare function parseMessageId(buffer: Uint8Array, startIndex: number): number;
export declare function createHeaderFlagsError(requiredHeaderFlag: number, types: string): string;
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