INonceManager.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice Contract interface that allows managing sender nonces.
interface INonceManager {
  /// @notice Increments the outbound nonce for a given sender on a given destination chain.
  /// @param destChainSelector The destination chain selector.
  /// @param sender The sender address.
  /// @return incrementedOutboundNonce The new outbound nonce.
  function getIncrementedOutboundNonce(uint64 destChainSelector, address sender) external returns (uint64);

  /// @notice Increments the inbound nonce for a given sender on a given source chain.
  /// @notice The increment is only applied if the resulting nonce matches the expectedNonce.
  /// @param sourceChainSelector The destination chain selector.
  /// @param expectedNonce The expected inbound nonce.
  /// @param sender The encoded sender address.
  /// @return incremented True if the nonce was incremented, false otherwise.
  function incrementInboundNonce(
    uint64 sourceChainSelector,
    uint64 expectedNonce,
    bytes calldata sender
  ) external returns (bool);
}