export declare const CURRENT_PROTOCOL_VERSION = 4;
export declare const REGISTER_ACK_TIMEOUT_MS = 15000;
export declare const SEND_ACK_TIMEOUT_MS = 15000;
export interface RegisterEvent {
    event: "REGISTER";
    token: string;
    protocolVersion: number;
    clientVersion?: string;
    hostVersion?: string;
}
export interface AddressedSendEvent {
    event: "SEND_MESSAGE";
    messageId: string;
    to: string;
    content: string;
    contentType: string;
    metadata?: Record<string, unknown>;
}
export interface RegisterAckEvent {
    event: "REGISTER_ACK";
    status: "ok" | "error";
    reason?: string;
    protocolVersion: number;
}
export interface SendAckEvent {
    event: "SEND_ACK";
    messageId: string;
    status: "delivered" | "stored";
    messageRef?: string;
    addressedTarget?: {
        address: string;
        basis: "resolved" | "forwarded";
    };
}
export type ObservedSendAckEvent = Omit<SendAckEvent, "status" | "messageRef" | "addressedTarget"> & {
    status: string;
    messageRef?: unknown;
    addressedTarget?: unknown;
};
export interface AddressedMessageEvent {
    event: "MESSAGE_RECEIVED";
    messageId?: string;
    from: string;
    content: string;
    contentType: string;
    metadata: Record<string, unknown>;
    sentAt?: string;
}
export interface NodeRefView {
    kind: string;
    mstpAddress: string;
    handle?: string;
    displayName?: string;
    avatarUrl?: string;
}
export interface StructuredErrorEvent {
    event: "ERROR";
    messageId?: string;
    to?: string;
    code: string;
    message: string;
}
export type PluginToConnectorEvent = RegisterEvent | AddressedSendEvent;
export type ConnectorToPluginEvent = RegisterAckEvent | SendAckEvent | AddressedMessageEvent | StructuredErrorEvent;
export declare function isRegisterAck(data: unknown): data is RegisterAckEvent;
export declare function isSendAck(data: unknown): data is ObservedSendAckEvent;
export declare function isAddressedMessage(data: unknown): data is AddressedMessageEvent;
export declare function isStructuredError(data: unknown): data is StructuredErrorEvent;
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