/**
 * Encodes a non-negative integer into Protobuf Variant format.
 * @param value - The non-negative integer to encode.
 * @returns A Uint8Array containing the Variant bytes.
 */
export declare function encodeVariant(value: number): Uint8Array;
/**
 * Converts a non-negative integer (up to 32 bits) to a 4-byte Big Endian Uint8Array.
 * @param value - The number to convert.
 * @returns A 4-byte Uint8Array.
 */
export declare function uint32ToBigEndianBytes(value: number): Uint8Array;
/**
 * Appends a uint32 index to a byte array (typically a SubnetID) to compute a derived ID.
 * This mimics the Go `ids.ID.Append(uint32)` logic used for bootstrap validator IDs.
 * @param baseIDBytes - The base ID bytes (e.g., SubnetID).
 * @param index - The uint32 index to append.
 * @returns The combined ID bytes.
 */
export declare function computeDerivedID(baseIDBytes: Uint8Array, index: number): Uint8Array;
/**
 * Manually marshals the ConvertSubnetToL1TxData justification protobuf.
 * L1ValidatorRegistrationJustification {
 *   oneof preimage {
 *     // Field 1
 *     SubnetIDIndex convert_subnet_to_l1_tx_data = 1;
 *     // Field 2
 *     bytes register_l1_validator_message = 2;
 *   }
 * }
 * SubnetIDIndex {
 *   bytes subnet_id = 1; // wire type 2
 *   uint32 index = 2;   // wire type 0 (varint)
 * }
 *
 * @param subnetIDBytes - The raw bytes of the subnet ID.
 * @param index - The bootstrap index.
 * @returns The marshalled L1ValidatorRegistrationJustification bytes.
 */
export declare function marshalConvertSubnetToL1TxDataJustification(subnetIDBytes: Uint8Array, index: number): Uint8Array;
/**
 * Marshals the payload bytes into a RegisterL1ValidatorMessage justification format.
 * This creates a protobuf-encoded field 2 (register_l1_validator_message) with the payload bytes.
 *
 * L1ValidatorRegistrationJustification {
 *   oneof preimage {
 *     // Field 1
 *     SubnetIDIndex convert_subnet_to_l1_tx_data = 1;
 *     // Field 2
 *     bytes register_l1_validator_message = 2;
 *   }
 * }
 *
 * @param payloadBytes - The payload bytes to marshal (RegisterL1ValidatorMessage bytes).
 * @returns The marshalled justification bytes with protobuf field tag and length.
 */
export declare function marshalRegisterL1ValidatorMessageJustification(payloadBytes: Uint8Array): Uint8Array;
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