/**
 * Creates a function that will "batch" calls that are within the `timeout`
 *
 * The first time the function that is created is called, it will wait the `timeout` for additional calls.
 * After the `timeout` expires the result of one execution of `fn` will be resolved to all calls during the `timeout`.
 *
 * If `runNowFn` is specified it will be run synchronously without a timeout. Useful for functions that are used to set rather than get.
 *
 * @param {() => Promise<T>} fn
 * @param {number} timeout (ms)
 * @param {(arg: U) => void} [runNowFn]
 * @returns {(arg?: U) => Promise<T>}
 */
export declare function deferAndCombine<T, U>(fn: (requestCount: number) => Promise<T>, timeout: number, runNowFn?: (arg: U) => void): (arg?: U) => Promise<T>;
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