/**
 * Prevents "swarm" of async calls to the same method.
 * Allows max 1 in-flight promise to exist.
 * If more calls appear, while Promise is not resolved yet - same Promise is returned.
 *
 * Does not support `cacheKey`.
 * So, the same Promise is returned, regardless of the arguments.
 */
export declare const _SwarmSafe: () => MethodDecorator;