/**
 * Copyright (c) 2014-present Houfeng
 * @homepage https://github.com/Houfeng/ober
 * @author Houfeng <houzhanfeng@gmail.com>
 */
import { Flag } from "./Flag";
/**
 * 是否触发 change 事件
 */
export declare const changeFlag: Flag<boolean>;
/**
 * 是否触发 unref 事件
 */
export declare const unrefFlag: Flag<boolean>;
/**
 * 是否触发 ref 事件
 */
export declare const refFlag: Flag<boolean>;
export type ObserveEvent = {
    id: string;
    member: PropertyKey;
    value?: any;
};
export declare function ObserveKey(event: ObserveEvent): string;
export type ObserveListener = {
    (event: ObserveEvent): void;
    dependencies?: Set<string>;
};
export type ObserveEvents = {
    /**
     * 在属性值发生变化时触发
     */
    change: ObserveListener;
    /**
     * 在最后一个监听移除时触发
     */
    unref: ObserveListener;
    /**
     * 在第一个监听建立时触发
     **/
    ref: ObserveListener;
};
export type ObserveEventNames = keyof ObserveEvents;
export declare function subscribe<T extends ObserveEventNames>(type: T, listener: ObserveEvents[T]): void;
export declare function unsubscribe<T extends keyof ObserveEvents>(type: T, listener: ObserveEvents[T]): void;
export declare function emitChange(event: ObserveEvent): void;
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