rules:
    -
      id: use-custom-error-not-require
      message: >-
        Consider using custom errors as they are more gas efficient while allowing developers 
        to describe the error in detail using NatSpec.
      metadata:
          references:
          - https://blog.soliditylang.org/2021/04/21/custom-errors/
          category: performance
          technology:
          - solidity
      patterns:
            # todo: check pragma when semgrep supports it
            # - pattern-regex: pragma solidity .*0\.8\.([3-9]|\d\d+);
            - pattern-either:
                - pattern: require(..., "$MSG");
                - pattern: revert("$MSG");
      languages: 
      - solidity
      severity: INFO