Corrected twitter card for Gatsby

gistfile1.txt

  return (
    <Helmet
      htmlAttributes={{
        lang,
      }}
      title={title}
      titleTemplate={`%s`}
      meta={[
        {
          name: `description`,
          content: site.siteMetadata.description,
        },
        {
          property: `og:title`,
          content: title,
        },
        {
          property: `og:description`,
          content: metaDescription,
        },
        {
          property: `og:type`,
          content: `website`,
        },
        {
          property: `twitter:image`,
          content: `https://example.com/a_full_image_url_goes_here.jpg`
        },
        {
          property: `twitter:image:alt`,
          content: `A beautiful photograph`
        },
        {
          name: `twitter:card`,
          content: `summary_large_image`,
        },
        {
          name: `twitter:site`,
          content: site.siteMetadata.author,
        },
        {
          name: `twitter:title`,
          content: title,
        },
        {
          name: `twitter:description`,
          content: site.siteMetadata.description,
        },
      ].concat(meta)}
    />
  )
}