class RuboCop::Cop::Lint::DuplicateRequire


require_relative ‘foo’
require ‘foo’
# good
require ‘bar’
require ‘foo’
# good
require ‘foo’
require ‘bar’
require ‘foo’
# bad
@example
This cop checks for duplicate ‘require`s and `require_relative`s.

def on_new_investigation 

def on_new_investigation
  # Holds the known required files for a given parent node (used as key)
  @required = Hash.new { |h, k| h[k] = Set.new }.compare_by_identity
  super
end

def on_send(node) 

def on_send(node)
  return unless require_call?(node)
  return if @required[node.parent].add?("#{node.method_name}#{node.first_argument}")
  add_offense(node, message: format(MSG, method: node.method_name))
end