code: function warning(message) {
    /* eslint-disable no-console */
    if (typeof console !== 'undefined' && typeof console.error === 'function') {
      console.error(message);
    }
    /* eslint-enable no-console */
    try {
      // This error was thrown as a convenience so that if you enable
      // "break on all exceptions" in your console,
      // it would pause the execution at this line.
      throw new Error(message);
      /* eslint-disable no-empty */
    } catch (e) {}
    /* eslint-enable no-empty */
  }
docs: Prints a warning in the console if it exists.
  
  @param {String} message The warning message.
  @returns {void}