Make Style/EmptyHeredoc aware of EnforcedStyle of `Style/StringLi…

…terals`

Follow up #10820 (comment).

lib/rubocop/cop/style/empty_heredoc.rb

@@ -48,11 +48,25 @@ def on_heredoc(node)
           add_offense(node) do |corrector|
             heredoc_end = node.loc.heredoc_end
 
-            corrector.replace(node, "''")
+            corrector.replace(node, preferred_string_literal)
             corrector.remove(range_by_whole_lines(heredoc_body, include_final_newline: true))
             corrector.remove(range_by_whole_lines(heredoc_end, include_final_newline: true))
           end
         end
+
+        private
+
+        def preferred_string_literal
+          enforce_double_quotes? ? '""' : "''"
+        end
+
+        def enforce_double_quotes?
+          string_literals_config['EnforcedStyle'] == 'double_quotes'
+        end
+
+        def string_literals_config
+          config.for_cop('Style/StringLiterals')
+        end
       end
     end
   end

spec/rubocop/cop/style/empty_heredoc_spec.rb

@@ -68,4 +68,22 @@
       EOS
     RUBY
   end
+
+  context 'when double-quoted string literals are preferred' do
+    let(:other_cops) do
+      super().merge('Style/StringLiterals' => { 'EnforcedStyle' => 'double_quotes' })
+    end
+
+    it 'registers an offense when using empty `<<~EOS` heredoc' do
+      expect_offense(<<~RUBY)
+        <<~EOS
+        ^^^^^^ Use an empty string literal instead of heredoc.
+        EOS
+      RUBY
+
+      expect_correction(<<~RUBY)
+        ""
+      RUBY
+    end
+  end
 end