export declare const holder: WeakMap<object, any>;
export declare const rootInstanceSymbol: unique symbol;
/**
 * Register an object as a root instance.
 *
 * @param  {object} object An object to associate with root instance flag.
 */
export declare function registerAsRootInstance(object: object): void;
/**
 * Check if the source of the root indication call is valid.
 *
 * @param  {symbol} rootSymbol A symbol as a source of truth.
 * @returns {boolean}
 */
export declare function hasValidParameter(rootSymbol: unknown): rootSymbol is typeof rootInstanceSymbol;
/**
 * Check if passed an object was flagged as a root instance.
 *
 * @param  {object} object An object to check.
 * @returns {boolean}
 */
export declare function isRootInstance(object: object): boolean;