vm.startBroadcast();Who is msg.sender at this time?

[chaoticpunk]

function broadcast() external;
function broadcast(address who) external;
function broadcast(uint256 privateKey) external;

https://book.getfoundry.sh/cheatcodes/broadcast

contract Deploy is Script {
    function run() external {
        vm.startBroadcast();

        Vault vault = new Vault();
        vault.deposit{value: 10 ether}();

        console.log("address:Vault", address(vault));
    }
}

In this example, in this Deploy contract, when deploying the Vault contract,Who is msg.sender?

[urosognjenovic]

When deploying the Vault contract, msg.sender is the account that you used to deploy the contract (the one that you specified either using --private-key yourPrivateKey or using --account yourEncryptedAccount).

You can check the msg.sender by adding a console log inside of your contract like this:

contract Deploy is Script {
    function run() external {
        vm.startBroadcast();

        Vault vault = new Vault();
        vault.deposit{value: 10 ether}();
        console.log(msg.sender);

        console.log("address:Vault", address(vault));
    }
}