export declare enum PopCommandType {
    User = "USER",
    Pass = "PASS",
    Quit = "QUIT",
    Stat = "STAT",
    List = "LIST",
    Retr = "RETR",
    Dele = "DELE",
    Noop = "NOOP",
    Rset = "RSET",
    Top = "TOP",
    Uidl = "UIDL",
    Capa = "CAPA",
    Lang = "LANG",
    Apop = "APOP"
}
export declare class PopCommand {
    readonly type: PopCommandType;
    readonly args: string | null;
    /**
     * Constructs a new PopCommand.
     * @param type the type of command.
     * @param args the arguments.
     */
    constructor(type: PopCommandType, args: string | null);
    /**
     * Gets the args as a single string.
     */
    get argument(): string | null;
    /**
     * Gets the args as multiple arguments.
     */
    get arguments(): string[] | null;
    /**
     * Decodes the given command string.
     * @param raw the raw command.
     * @returns the parsed command.
     */
    static decode(raw: string): PopCommand;
    /**
     * Encodes the current command.
     * @param add_newline if the encoded version should include a  newline.
     */
    encode(add_newline?: boolean): string;
}