import { Fr } from '@aztec/foundation/curves/bn254';
/**
 * Computes the out hash of a tx. It's the root of the unbalanced tree of all the L2-to-L1 messages emitted by the tx.
 * @param messages - The L2-to-L1 messages emitted by the tx.
 * @returns The out hash of the tx.
 */
export declare function computeTxOutHash(messages: Fr[]): Fr;
/**
 * Computes the out hash of a block. It's the root of the wonky tree of all the tx out hashes.
 * @param messagesPerTx - The L2-to-L1 messages emitted by the txs in the block. This is an array of message arrays.
 * The array at index 0 contains the messages emitted by the first tx, the array at index 1 contains the messages
 * emitted by the second tx, and so on.
 * @returns The out hash of the block.
 */
export declare function computeBlockOutHash(messagesPerTx: Fr[][]): Fr;
/**
 * Computes the out hash of a checkpoint. It's the root of the wonky tree of all the block out hashes.
 * @param messagesPerBlock - The L2-to-L1 messages emitted by the txs in the blocks in the checkpoint. This is an array
 * of arrays of messages. The array at index 0 contains the arrays of messages emitted by the first block, the array at
 * index 1 contains the arrays of messages emitted by the second block, and so on.
 * @returns The out hash of the checkpoint.
 */
export declare function computeCheckpointOutHash(messagesPerBlock: Fr[][][]): Fr;
/**
 * Computes the accumulated (epoch) out hash of a checkpoint. It's the root of the balanced tree of all the out hashes
 * from the first checkpoint in an epoch to the current checkpoint.
 * It's this value that's set to the checkpoint header and validated on L1 instead of the checkpoint out hash.
 * @param checkpointOutHashes - The out hashes of all checkpoints in the epoch.
 * @returns The accumulated (epoch) out hash.
 */
export declare function accumulateCheckpointOutHashes(checkpointOutHashes: Fr[]): Fr;
/**
 * Computes the epoch out hash. It's the root of the balanced tree of all the checkpoint out hashes.
 * It should match the **accumulated** out hash of the last checkpoint in the epoch.
 * This value will be inserted into the Outbox on L1.
 * @param messagesPerCheckpoint - The L2-to-L1 messages emitted by the txs in the blocks in the checkpoints in the epoch.
 * This is an array of arrays of arrays of messages. The array at index 0 contains the arrays of arrays of messages
 * emitted by the first checkpoint, the array at index 1 contains the arrays of arrays of messages emitted by the second
 * checkpoint, and so on.
 * @returns The epoch out hash.
 */
export declare function computeEpochOutHash(messagesPerCheckpoint: Fr[][][][]): Fr;
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