import { JsonObjType } from './baseUri';
import { ConstantUri } from './constantUri';
export declare class EmptyUri extends ConstantUri {
    private static _instance;
    private constructor();
    static get instance(): EmptyUri;
    toJsonObj(): JsonObjType;
    static isEmptyUri(uri: any): uri is EmptyUri;
    isEmpty(): boolean;
    toString(): string;
}