class RuboCop::Cop::Sorbet::ValidSigil

def check_strictness_valid(sigil, strictness)
  return true if STRICTNESS_LEVELS.include?(strictness)
  add_offense(
    sigil.pos,
    message: format(INVALID_SIGIL_MSG, sigil: strictness),
  ) do |corrector|
    autocorrect(corrector)
  end
  false
end