import { RpcObservableRequestContext } from '../rpc-observable-request';
import { RpcObservableResultContext } from '../rpc-observable-result';
/**
 * RPC Extension Data request name and version.
 */
export declare class RpcObservableExtensionDataKey {
    static command: string;
    static version: string;
}
/**
 * Rpc observable extension data.
 */
export interface RpcObservableExtensionDataRequest extends RpcObservableRequestContext {
    extension: string;
    key: string;
    data?: string;
}
export interface RpcObservableExtensionDataResult extends RpcObservableResultContext {
    data?: string;
}
export interface RpcObservableExtensionDataError extends RpcObservableResultContext {
    error: string;
}