text: function getEmptyInitInstructionsMessage() {
    return {
      subject: "initInstructions",
      exerciseID: -1,
      content: ""
    }
  };
  
  function getEmptyInitTipsMessage() {
    return {
      subject: "initTips",
      exerciseID: -1,
      content: ""
    };
  };
  
  function getEmptyExerciseStateMessage() {
    return {
      subject: "updatedExerciseState",
      exerciseID: -1,
      content: false
    }
  }
  
  function getEmptyUpdatePageVariablesMessage() {
    return {
      subject: "updatePageVariables"
    }
  }
  
  export {
    getEmptyInitInstructionsMessage,
    getEmptyInitTipsMessage,
    getEmptyExerciseStateMessage,
    getEmptyUpdatePageVariablesMessage};