SetMeta.js

import React from "react"
import { Helmet } from "react-helmet"
import PropTypes from "prop-types"

export default function SetMeta({ title, description }) => (
  <Helmet titleTemplate="My Site | %s">
    <title itemProp="name" lang="en">{title}</title>
    <meta name="description" content={description} />
  </Helmet>
)

SetMeta.propTypes = {
  title: PropTypes.string.isRequired,
  description: PropTypes.string.isRequired,
}