Not composable component

Button.jsx

import React from 'react';

type Props = {
  isPrimary?: boolean,
  isSecondary?: boolean,
  isHeaderButton?: boolean,
  children: string,
};

const Button = (props: Props) => {
  /* Button markup logic */
};

export default Button;

/*
  <Button isPrimary>Primary</Button>
  <Button isSecondary>Secondary</Button>
  <Button isHeaderButton>Header Button</Button>
*/