import { Ref } from 'vue';
/**
 * Composable for managing a single timer.
 */
export declare const useTimer: (endTime: Ref<ConstructorParameters<typeof Date>[0]>) => {
    /**
     * Time (in milliseconds) that the timer has left.
     */
    timeLeft: Readonly<Ref<number, number>>;
    /**
     * Whether the timer is ended.
     */
    isEnded: import('vue').ComputedRef<boolean>;
};