/**
 * Content-Length framing helpers for JSON-RPC over named pipes / stdio.
 *
 * Wire format:
 *   Content-Length: <N>\r\n\r\n<UTF-8 body of N bytes>
 */
/**
 * Encode a UTF-8 string into a Content-Length frame.
 */
export declare function encodeFrame(body: string): Buffer;
/**
 * Find the end of the Content-Length header (position of \r\n\r\n).
 * Returns -1 if not yet present.
 */
export declare function findHeaderEnd(buf: Buffer): number;
/**
 * Extract the Content-Length value from a header block.
 * Returns -1 if not parseable.
 */
export declare function parseContentLength(headerBlock: Buffer): number;
/**
 * Given a buffer that may contain a complete Content-Length frame,
 * extract the body string. Throws if the frame is incomplete or header
 * is missing.
 */
export declare function decodeFrame(buf: Buffer): string;
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