export default class Layer2Registry {
    private static _instance;
    private static _address;
    private _contract;
    private constructor();
    static instance(): Layer2Registry;
    static setNetwork(net: string): void;
    static get address(): string;
    numLayer2s(): Promise<number>;
    layer2ByIndex(index: number): Promise<string>;
    layer2s(layer2: string): Promise<boolean>;
}