import { Disposable } from '@typed/disposable';
import { Arity1 } from '@typed/lambda';
import { Timer } from './types';
/**
 * Call a function at a given interval using a Timer.
 * @param fn :: (number -> *)
 * @param interval :: number
 * @param timer :: Timer
 * @returns :: Disposable
 */
export declare function interval(fn: Arity1<number, Disposable>, interval: number, timer: Timer): Disposable;
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