/**
 * Returns true if the stream is a system stream.
 * @param streamId - The stream id to test against.
 */
export declare const isSystemStream: (streamId: string) => boolean;
/**
 * Returns true if the stream is a metadata stream.
 * @param streamId - The stream id to test against.
 */
export declare const isMetastream: (streamId: string) => boolean;
/**
 * Returns the metadata stream of the stream.
 * @param streamId - The stream id to get the metastream name of.
 */
export declare const metastreamOf: (streamId: string) => string;
/**
 * Returns the original stream of the metadata stream.
 * @param metastreamId - The metastream id to get the original stream name of.
 */
export declare const originalStreamOf: (metastreamId: string) => string;