module RuboCop::Cop::ArraySyntax

def array_of?(element_type, node)
  return false unless square_brackets?(node)
  array_elems = node.children
  # no need to check empty arrays
  return false unless array_elems && array_elems.size > 1
  array_elems.all? { |e| e.type == element_type }
end

def square_brackets?(node)
  node.loc.begin && node.loc.begin.is?('[')
end