{
    "Function": "_transferShares",
    "File": "contracts/mocks/stETHMock.sol",
    "Parent Contracts": [
        "node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol"
    ],
    "High-Level Calls": [
        "SafeMath",
        "SafeMath"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)"
    ],
    "Library Calls": [
        "sub",
        "add"
    ],
    "Low-Level Calls": [],
    "Code": "function _transferShares(\n        address _sender,\n        address _recipient,\n        uint256 _sharesAmount\n    ) internal {\n        require(_sender != address(0), \"TRANSFER_FROM_THE_ZERO_ADDRESS\");\n        require(_recipient != address(0), \"TRANSFER_TO_THE_ZERO_ADDRESS\");\n\n        uint256 currentSenderShares = shares[_sender];\n        require(\n            _sharesAmount <= currentSenderShares,\n            \"TRANSFER_AMOUNT_EXCEEDS_BALANCE\"\n        );\n\n        shares[_sender] = currentSenderShares.sub(_sharesAmount);\n        shares[_recipient] = shares[_recipient].add(_sharesAmount);\n    }"
}