You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client_execution.rb
    path of file: ./repos/hyperstack/ruby/hyper-spec/lib/hyper-spec/internal
    
    the code of the file until where you have to start completion: module HyperSpec
  module Internal
    module ClientExecution
      def internal_evaluate_ruby(*args, &block)
        insure_page_loaded
        add_promise_execute_and_wait(*pro
    
      def add_opal_block(str, block)
        return str unless block

        source = block.source
        ast = Parser::CurrentRuby.parse(source)
        ast = find_block(ast)
        raise "could not find block within source: #{block.source}" unless ast

        "#{add_locals(str, block)}\n#{Unparser.unparse ast.children.last}"
      end