solhint
no-unchecked-calls
The {“extends”: “solhint:recommended”} property in a configuration file enables this rule.
Description
Check return value of low-level calls (call, staticcall, delegatecall).
Options
This rule accepts a string option for rule severity. Must be one of “error”, “warn”, “off”. Defaults to warn.
Example Config
{
"rules": {
"no-unchecked-calls": "warn"
}
}
Notes
- Unlike avoid-low-level-calls, this rule allows low-level calls but requires their return value to be checked.
Examples
👍 Examples of correct code for this rule
Return value of low-level call checked with tuple assignment
(bool success, ) = addr.call(data);
(bool success, bytes memory result) = addr.call(data);
if(addr.call(data)) {}
require(addr.call(data));
assert(addr.call(data));
👎 Examples of incorrect code for this rule
Return value of low-level call ignored
addr.call(data);
addr.staticcall(data);
addr.delegatecall(data);
addr.call{value: 1 ether}("");
addr.call.value(1)();
Version
This rule was introduced in the latest version.