Unused Imports

Property	Value
Rule Code	NTX14
Severity	Warning

Background

Unused imports make the code harder to understand and maintain. They can mislead developers about the contract's dependencies and may indicate incomplete refactoring or copy-paste errors.

Purpose

This rule detects import statements that are never referenced in the contract code.

Example

# Non-compliant code
from ethereum.ercs import IERC20  # Warning: Import 'IERC20' is not used
from ethereum.ercs import IERC721  # Warning: Import 'IERC721' is not used

counter: uint256

@external
def increment():
    self.counter += 1

# Compliant code
from ethereum.ercs import IERC20

token: IERC20

@external
def set_token(addr: address):
    self.token = IERC20(addr)