What meta tags you need for a Gatsby site

In almost every Gatsby site I make, I create a <Head /> component with all the meta tags I’ll need. I reuse that component on every page, passing in different titles and descriptions.

There’s definitely more meta tags you could use, but I’ve whittled it down to this component:

import React from "react"
import { Helmet } from "react-helmet"

export default ({ title, description, shareImage }) => {
  return (
    <Helmet>
      <title>{title}</title>
      <meta name="description" content={description} />

      <meta property="og:type" content="website" />
      <meta property="og:site_name" content="My Site" />
      <meta property="og:title" content={title} />
      <meta property="og:description" content={description} />
      <meta property="og:image" content={shareImage} />

      <meta property="twitter:card" content="summary_large_image" />

      <link rel="icon" href="/link/to/favicon.png" />
    </Helmet>
  )
}

A couple notes

There’s some repeats (title and og:title, description and og:description), but since this is a reusable component it isn’t really more work to include both.
The og:image is quite important to me, because a nice share image makes the link stand out when it’s shared on Twitter or elsewhere.
The twitter:card tag tells Twitter to make the share image as large as possible in a tweet.
You can also add equivalent twitter:title etc tags, but Twitter falls back on og: tags, so there’s no need to include both.