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: discourse_js_processor.rb
    path of file: ./repos/discourse/lib
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require "execjs"
require "mini_racer"

class DiscourseJsProcessor
  class TranspileError < StandardError
  end

  # To generate a list of
    
    def self.v8_call(*args, **kwargs)
      fetch_result_call = kwargs.delete(:fetch_result_call)
      mutex.synchronize do
        result = v8.call(*args, **kwargs)
        result = v8.call(fetch_result_call) if fetch_result_call
        result
      end
    rescue MiniRacer::RuntimeError => e
      message = e.message
      begin
        # Workaround for https://github.com/rubyjs/mini_racer/issues/262
        possible_encoded_message = message.delete_prefix("Error: ")
        decoded = JSON.parse("{\"value\": #{possible_encoded_message}}")["value"]
        message = "Error: #{decoded}"
      rescue JSON::ParserError
        message = e.message
      end