@storybook/cli/dist/cjs/frameworks/web-components/js/Header.stories.js

Storybook's CLI - easiest method of adding storybook to your projects

import { Header } from './Header';

export default {
  title: 'Example/Header',
};

const Template = (args) => Header(args);

export const LoggedIn = Template.bind({});
LoggedIn.args = {
  user: {},
};

export const LoggedOut = Template.bind({});
LoggedOut.args = {};