import { default as React } from 'react';
/**
 * Custom hook for creating a lazy-initialized mutable ref.
 * @template T - The type of the value stored in the ref.
 * @param {() => T} fn - A function that returns the initial value for the ref.
 * @returns {React.MutableRefObject<T>} - The mutable ref object.
 */
export declare function useLazyRef<T>(fn: () => T): React.MutableRefObject<T>;
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