import { Extendable } from '..';
import { Core } from '../../..';
/**
 * This method allows safely type casting an Extendable object to include an extension type.
 *
 * It assumes you are checking if the target extension has declared its name to the core,
 * and if that name is found in core's declaredExtensionNames, it will complete the type cast.
 */
export declare const hasExtension: <T>(extendable: Extendable, core: Core, extensionName: string) => extendable is Extendable & T;