import { Ref } from 'vue';
declare function useInterval(
/**
 * The function to be executed every `delay` milliseconds.
 */
fn: () => void, 
/**
 * The time in milliseconds, the timer should delay in between executions of the specified function. The timer will be cancelled if delay is set to `undefined`.
 */
delay: Ref<number | undefined> | number | undefined, options?: {
    /**
     * Whether the function should be executed immediately on first execution.
     */
    immediate?: boolean;
}): {
    /**
     * Clear the interval timer.
     */
    clear: VoidFunction;
    /**
     * Restart the interval timer.
     */
    restart: VoidFunction;
};
export default useInterval;