storybook/addons/contexts/src/manager/components/ToolBar.tsx

import React, { ComponentProps, memo } from 'react';
import { Separator } from '@storybook/components';
import { ToolBarControl } from './ToolBarControl';
import { ContextNode, FCNoChildren, SelectionState } from '../../shared/types.d';

type ToolBar = FCNoChildren<{
  nodes: ContextNode[];
  state: SelectionState;
  setSelected: ComponentProps<typeof ToolBarControl>['setSelected'];
}>;

export const ToolBar: ToolBar = memo(({ nodes, state, setSelected }) =>
  nodes.length ? (
    <>
      <Separator />
      {nodes.map(({ components, ...forwardProps }) => (
        <ToolBarControl
          {...forwardProps}
          setSelected={setSelected}
          selected={state[forwardProps.nodeId] || ''}
          key={forwardProps.nodeId}
        />
      ))}
    </>
  ) : null
);