Updated unary expression to put space when typeof is the operator

Author: bryanjos

CHANGELOG.md

@@ -1,3 +1,8 @@
+# v2.1.2
+
+* Bug fixes
+  * ESTree.Tools.Generator: updated UnaryExpression to put space in when operator is :typeof 
+
 # v2.1.1
 
 * Enhancements

lib/es_tree/tools/generator.ex

@@ -291,6 +291,10 @@ defmodule ESTree.Tools.Generator do
     Enum.map_join(expressions, ",", &generate(&1))
   end
 
+  def do_generate(%ESTree.UnaryExpression{operator: :typeof, prefix: true, argument: argument}, level) do
+    "#{generate(:typeof)} #{generate(argument)}"
+  end
+
   def do_generate(%ESTree.UnaryExpression{operator: operator, prefix: true, argument: argument}, level) do
     "#{generate(operator)}#{generate(argument)}"
   end