import type PortalClient from "../index";
import type { IExtension, IExtensionConstructor } from "../index";
export default class ExtensionHandler {
    client: PortalClient;
    private extensionMap;
    constructor(client: PortalClient);
    private getExtension;
    static add<T extends IExtension>(extensionConstructor: IExtensionConstructor<T>, extensionName: string): void;
}