old_contents: 
  
  /**
   * Rename a function to a new name, for call stack and debugging
   *
   * @param {Function} func the function to rename
   * @param {String} newName the new name
   */
  function renameFunction(func, newName) {
      // eslint-disable-next-line no-unused-vars
      const { value, ...others } = Object.getOwnPropertyDescriptor(func, 'name');
      Object.defineProperty(func, 'name', { value: newName, ...others });
  }
  
  export default renameFunction;
new_contents: 
  
  /**
   * Rename a function to a new name, for call stack and debugging
   *
   * @param {Function} func the function to rename
   * @param {String} newName the new name
   */
  function renameFunction(func, newName) {
      // eslint-disable-next-line no-unused-vars
      const prop = Object.getOwnPropertyDescriptor(func, 'name');
      if (prop) {
          const { value, ...others } = prop;
          Object.defineProperty(func, 'name', { value: newName, ...others });
      }
  }
  
  export default renameFunction;
subject: Rename function - Make it safer for IE