/// <reference types="react" />
/**
 * Creates a ref that can be initalized with a callback (lazily).
 * This is useful so we don't have to construct a class or call a function every time we
 * call this hook in a component as that could be costly.
 *
 * Inspiration is from https://github.com/facebook/react/issues/14490
 *
 * @param init Initial value
 * @returns A React ref that was initalized with `init`
 *
 * @example
 * const ref = useLazyRef(() => new MyExpensiveClass());
 * ref.current.doSomething();
 */
export declare function useLazyRef<T>(init: () => T): import("react").MutableRefObject<T>;