How to use the @material/toolbar/index.MDCToolbar function in @material/toolbar

autoInit.register('MDCGridList', gridList.MDCGridList);
autoInit.register('MDCIconToggle', iconToggle.MDCIconToggle);
autoInit.register('MDCLineRipple', lineRipple.MDCLineRipple);
autoInit.register('MDCLinearProgress', linearProgress.MDCLinearProgress);
autoInit.register('MDCNotchedOutline', notchedOutline.MDCNotchedOutline);
autoInit.register('MDCRadio', radio.MDCRadio);
autoInit.register('MDCSnackbar', snackbar.MDCSnackbar);
autoInit.register('MDCTab_', tab.MDCTab);
autoInit.register('MDCTabIndicator', tabIndicator.MDCTabIndicator);
autoInit.register('MDCTab', tabs.MDCTab);
autoInit.register('MDCTabBar', tabs.MDCTabBar);
autoInit.register('MDCTextField', textField.MDCTextField);
autoInit.register('MDCMenu', menu.MDCMenu);
autoInit.register('MDCSelect', select.MDCSelect);
autoInit.register('MDCSlider', slider.MDCSlider);
autoInit.register('MDCToolbar', toolbar.MDCToolbar);
autoInit.register('MDCTopAppBar', topAppBar.MDCTopAppBar);

// Export all components.
export {
  autoInit,
  base,
  checkbox,
  chips,
  dialog,
  drawer,
  floatingLabel,
  formField,
  gridList,
  iconToggle,
  lineRipple,
  linearProgress,