code: function rewrite_code(code, node, replacement_string) {
          return code.substr(0, node.start.pos) + replacement_string + code.substr(node.end.endpos);
      }
docs: Modify code string with a new value based on start and end position of an UglifyJS.AST_Node
  @param  {string} code                code to modify
  @param  {UglifyJS.AST_Node} node     node to replace the content for
  @param  {string} replacement_string  replacement js encoded value for the property
  @return {string}                     modified code