import SignedMessage from "./SignedMessage";
export default class Subscription {
    channel: string;
    callback: (sender: string, data: any) => void;
    oldMessages: {
        [signature: string]: boolean;
    };
    constructor(channel: string, callback: (sender: string, data: any) => void);
    isNew(sm: SignedMessage): boolean;
    handlePublish(sm: SignedMessage): boolean;
}