import { Operation } from '../operation';
/**
 * Sleep for the given amount of milliseconds. If no duration is given, then
 * sleep indefinitely.
 *
 * ### Example
 *
 * ```typescript
 * import { main, sleep } from 'effection';
 *
 * main(function*() {
 *   yield sleep(2000);
 *   console.log("Hello lazy world!");
 * });
 * ```
 *
 * @param duration the number of milliseconds to sleep
 */
export declare function sleep(duration?: number): Operation<void>;
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