Root + Impact

[O-1] Replace require Statements with Custom Errors, only if solc version is 0.8.4 or higher.

Description

As stated in the official release of (Solidity 0.8.4)[https://soliditylang.org/blog/2021/04/21/custom-errors/], utilizing custom errors can reduce runtime and deployment costs, as indicated by the following benchmark, while also improving clarity in error handling.

Risk

Likelihood: Low

Impact: None

Proof of Concept

Lets take the Game::nonReentrant modifier as example:

This modifier requires the _locked value to be false in order to continue its logic.

Recommended Mitigation

Consider update to solidity version 0.8.4 or higher and replacing all require statements with custom errors.

Then you can add a custom error like this:

Consider to apply this methodology to replace all require conditionals using the example above.