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A quick Solidity → Sway cross reference for the most commonly used items

• block.timestamp
• msg.sender
• etc

If something is missing here you can most likely find it in the Sway STD Library

contract;
 
abi MyContract {
    fn test_function() -> bool;
}
 
impl MyContract for Contract {
    fn test_function() -> bool {
        true
    }
}