/**
 * Minimal RLP encoder/decoder for transaction signing. Supports byte strings
 * and (nested) lists. No support for other types — we never need them.
 *
 * Ref: https://ethereum.org/en/developers/docs/data-structures-and-encoding/rlp/
 */
export type RlpInput = Buffer | Uint8Array | RlpInput[];
export declare function rlpEncode(input: RlpInput): Buffer;
/**
 * Encode a non-negative integer as a minimal big-endian byte string,
 * dropping leading zeros. 0 encodes to empty buffer (RLP convention).
 */
export declare function encodeInt(n: number | bigint): Buffer;
export type Decoded = Buffer | Decoded[];
export declare function rlpDecode(buf: Buffer): Decoded;
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