Implicit Internal

Property	Value
Rule Code	NTX3
Severity	Style

Background

Since Vyper 0.4.0 functions without a visibility modifier will be marked as internal. Explicitly marking functions as @internal improves code clarity.

Purpose

Detects when internal functions are missing the @internal decorator.

Example

# Non-compliant - function is internal but not marked with @internal
def helper_function(x: uint256) -> uint256:
    return x * 2

# Compliant
@internal
def _helper_function(x: uint256) -> uint256:
    return x * 2

The helper_function would be flagged by this rule because it's not explicitly marked as @internal. The _helper_function is compliant.