export type PresentationStyle = 'compact' | 'expanded';
export interface MessageLayout {
    caption: string;
    subcaption?: string;
    trailingCaption?: string;
    trailingSubcaption?: string;
    imageUrl?: string;
    mediaFileUrl?: string;
    url?: string;
}
export interface ConversationInfo {
    conversationId: string;
    remoteParticipantIds: string[];
    participantCount: number;
    hasSelectedMessage: boolean;
}
export interface SelectedMessage {
    url?: string;
    caption?: string;
    subcaption?: string;
    trailingCaption?: string;
    trailingSubcaption?: string;
}
export interface AttachmentPayload {
    /** Alternate filename shown in Messages. */
    filename?: string;
    /** UTF-8 text written to a temp file and inserted. */
    contents?: string;
}
export declare class Messages {
    getPresentationStyle(): PresentationStyle | null;
    requestPresentationStyle(style: PresentationStyle): void;
    sendMessage(layout: MessageLayout): void;
    sendUpdate(layout: MessageLayout, sessionId: string): void;
    createSession(): string | null;
    insertAttachment(payload?: AttachmentPayload): Promise<boolean>;
    getConversationInfo(): ConversationInfo | null;
    addEventListener(eventName: 'onPresentationStyleChange', listener: (style: PresentationStyle) => void): any;
}
export declare const getPresentationStyle: () => PresentationStyle | null;
export declare const requestPresentationStyle: (style: PresentationStyle) => void;
export declare const sendMessage: (layout: MessageLayout) => void;
export declare const sendUpdate: (layout: MessageLayout, sessionId: string) => void;
export declare const createSession: () => string | null;
export declare const insertAttachment: (payload?: AttachmentPayload) => Promise<boolean>;
export declare const getConversationInfo: () => ConversationInfo | null;
export declare const addEventListener: (eventName: 'onPresentationStyleChange', listener: (style: PresentationStyle) => void) => any;
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