import type { WireMessage } from "../server/wire.js";
/**
 * Serialize and gzip a message slice, then base64-encode the compressed
 * bytes for safe transport inside a JSON `ws_event` frame.
 */
export declare function gzipEncodeMessages(messages: WireMessage[]): string;
/**
 * Type guard for the only supported history-compression encoding.
 */
export declare function shouldCompressHistory(encoding: string | undefined): encoding is "gzip-base64";
//# sourceMappingURL=history-compression.d.ts.map