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lib_openzeppelin_contracts/contracts/interfaces/IERC777Recipient.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC777Recipient.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Interface of the ERC-777 Tokens Recipient standard as defined in the ERC.
+ *
+ * Accounts can be notified of {IERC777} tokens being sent to them by having a
+ * contract implement this interface (contract holders can be their own
+ * implementer) and registering it on the
+ * https://eips.ethereum.org/EIPS/eip-1820[ERC-1820 global registry].
+ *
+ * See {IERC1820Registry} and {IERC1820Implementer}.
+ */
+interface IERC777Recipient {
+    /**
+     * @dev Called by an {IERC777} token contract whenever tokens are being
+     * moved or created into a registered account (`to`). The type of operation
+     * is conveyed by `from` being the zero address or not.
+     *
+     * This call occurs _after_ the token contract's state is updated, so
+     * {IERC777-balanceOf}, etc., can be used to query the post-operation state.
+     *
+     * This function may revert to prevent the operation from being executed.
+     */
+    function tokensReceived(
+        address operator,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata userData,
+        bytes calldata operatorData
+    ) external;
+}