/**
 * Copyright (c) 2014-present Houfeng
 * @homepage https://github.com/Houfeng/ober
 * @author Houfeng <houzhanfeng@gmail.com>
 */
export declare const $Observable: unique symbol;
export declare const $None: unique symbol;
export declare const $Bind: unique symbol;
export declare const $Pending: unique symbol;
export declare const $Identify: unique symbol;
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