import { ReactiveElement } from 'lit';
export declare function isReactiveElementProto(decoratorName: string, proto: any): proto is {
    constructor: typeof ReactiveElement;
};
export declare function isReactiveElementConstructor(decoratorName: string, ctor: any): ctor is typeof ReactiveElement;
/**
 * TC39 Decorator
 *
 * @param decoratorName
 * @param context
 * @link https://github.com/tc39/proposal-decorators
 */
export declare function throwIfTC39Decorator(decoratorName: string, context: any): void;