import { MessageContent } from "./model";
/**
 * 文本
 */
export declare class MessageText extends MessageContent {
    text?: string;
    constructor(text?: string);
    get conversationDigest(): string;
    get contentType(): number;
    decodeJSON(content: any): void;
    encodeJSON(): any;
}
export declare class MessageSignalContent extends MessageContent {
    get contentType(): number;
}
/**
 * 未知
 */
export declare class UnknownContent extends MessageContent {
    realContentType: number;
    get contentType(): number;
    get conversationDigest(): string;
    decodeJSON(content: any): void;
}
/**
 * 系统消息
 */
export declare class SystemContent extends MessageContent {
    content: any;
    private _displayText;
    decodeJSON(content: any): void;
    get conversationDigest(): string;
    get displayText(): string;
}
export declare class CMDContent extends MessageContent {
    cmd: string;
    param: any;
    decodeJSON(content: any): void;
    get contentType(): number;
}