import type { DefineOptions, ApolloController } from '@apollo-elements/core';
import type { ReactiveControllerHost } from 'lit';
/**
 * Fired when an element property changes
 */
export declare class PolymerChangeEvent<T> extends CustomEvent<{
    value: T;
}> {
    constructor(key: string, value: T);
}
/**
 * Decorator to fire a Polymer-Library-style `*-changed` event;
 */
export declare function notify(opts?: DefineOptions): <T extends HTMLElement & ReactiveControllerHost & {
    controller: ApolloController<any, any>;
}>(proto: T, name: keyof T) => void;