declare const messageTypes: readonly ["text", "audio", "video", "link"];
export type MessageType = (typeof messageTypes)[number];
declare const historyTypes: readonly ["view", "edit"];
export type HistoryType = (typeof historyTypes)[number];
declare const durationUnits: readonly ["ms", "s", "m", "h"];
export type DurationUnit = (typeof durationUnits)[number];
declare class Message {
    uid: string;
    type: MessageType;
    chat: string;
    sentBy: string;
    repliedTo?: string;
    deleted: boolean;
    deletedAt?: Date;
    deletedBy?: string;
    createdAt: Date;
    history: {
        type: HistoryType;
        user: string;
        extra: {
            [key: string]: any;
        };
        date: Date;
    }[];
    constructor(data?: Partial<Message>);
    wasViewedBy(userUid: string): boolean;
    clone(): Message;
    static isMessage(obj: any): obj is Message;
}
declare class TextMessage extends Message {
    type: "text";
    text: string;
    attachments?: {
        filename: string;
        extension: string;
        mimetype: string;
        size: number;
        path: string;
        url: string;
    }[];
    constructor(data?: Partial<TextMessage>);
    clone(): TextMessage;
    static isTextMessage(obj: any): obj is TextMessage;
}
declare class AudioMessage extends Message {
    type: "audio";
    audio: {
        url: string;
        duration: number;
        unit: DurationUnit;
    };
    constructor(data?: Partial<AudioMessage>);
    clone(): AudioMessage;
    static isAudioMessage(obj: any): obj is AudioMessage;
}
declare class VideoMessage extends Message {
    type: "video";
    video: {
        url: string;
        duration: number;
        unit: DurationUnit;
    };
    constructor(data?: Partial<VideoMessage>);
    clone(): VideoMessage;
    static isVideoMessage(obj: any): obj is VideoMessage;
}
export default Message;
export { TextMessage, AudioMessage, VideoMessage };