import { type KeepInitialValueOperator } from '../types/index.mjs';
/**
 * Emits the first value, then ignores subsequent values for a specified duration.
 * After the duration, the next emission is allowed through.
 *
 * @template A - The type of values from the source
 * @param milliSeconds - The throttle duration in milliseconds
 * @returns An operator that throttles emissions
 *
 * @example
 * ```ts
 * //  Timeline (250ms throttle):
 * //
 * //  Time(x50ms)  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
 * //
 * //  input$       0       2   3                   9   10  11  12  13  14
 * //               |- 250ms -> |- 250ms ->         |- 250ms ->    |- 250ms ->
 * //  throttled$   0           3                   9          12           (emitted at start of window)
 * //
 * //  Explanation:
 * //  - throttle emits the FIRST value received, then ignores subsequent values
 * //    for the specified duration (250ms)
 * //  - Unlike audit (which emits the LAST value), throttle emits the FIRST
 * //  - Useful for rate-limiting scroll/resize events
 *
 * const input$ = source<number>();
 *
 * const throttled$ = input$.pipe(throttle(250));
 *
 * const valueHistory: number[] = [];
 *
 * throttled$.subscribe((value) => {
 *   valueHistory.push(value);
 * });
 *
 * const sleep = (ms: number): Promise<void> =>
 *   new Promise((resolve) => {
 *     setTimeout(resolve, ms);
 *   });
 *
 * input$.next(0);
 *
 * assert.deepStrictEqual(valueHistory, [0]);
 *
 * await sleep(200);
 *
 * input$.next(2);
 *
 * assert.deepStrictEqual(valueHistory, [0]);
 *
 * await sleep(100);
 *
 * input$.next(3);
 *
 * assert.deepStrictEqual(valueHistory, [0, 3]);
 *
 * await sleep(300);
 *
 * input$.next(9);
 *
 * assert.deepStrictEqual(valueHistory, [0, 3, 9]);
 *
 * await sleep(100);
 *
 * input$.next(10);
 *
 * await sleep(100);
 *
 * input$.next(11);
 *
 * assert.deepStrictEqual(valueHistory, [0, 3, 9]);
 *
 * await sleep(100);
 *
 * input$.next(12);
 *
 * assert.deepStrictEqual(valueHistory, [0, 3, 9, 12]);
 * ```
 */
export declare const throttle: <A>(milliSeconds: number) => KeepInitialValueOperator<A, A>;
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