class RuboCop::Cop::RSpec::EmptyLineAfterFinalLet

it { does_something }
let(:something) { other }
let(:foo) { bar }
# good
it { does_something }
let(:something) { other }
let(:foo) { bar }
# bad
@example
Checks if there is an empty line after the last let block.

def autocorrect(node) 

def autocorrect(node)
  loc = last_node_loc(node)
  ->(corrector) { corrector.insert_after(loc.end, "\n") }
end

def heredoc_line(node, &block) 

def heredoc_line(node, &block)
  yield node.loc.heredoc_end if node.loc.respond_to?(:heredoc_end)
  node.each_child_node { |child| heredoc_line(child, &block) }
end

def last_node_loc(node) 

def last_node_loc(node)
  last_line = node.loc.end.line
  heredoc_line(node) do |loc|
    return loc if loc.line > last_line
  end
  node.loc.end
end

def no_new_line_after(node) 

def no_new_line_after(node)
  loc = last_node_loc(node)
  next_line = processed_source[loc.line]
  yield unless next_line.blank?
end

def on_block(node) 

def on_block(node)
  return unless example_group_with_body?(node)
  latest_let = node.body.child_nodes.select { |child| let?(child) }.last
  return if latest_let.nil?
  return if latest_let.equal?(node.body.children.last)
  no_new_line_after(latest_let) do
    add_offense(latest_let, location: :expression)
  end
end