/**
 * SEO component that queries for data with
 *  Gatsby's useStaticQuery React hook
 *
 * See: https://www.gatsbyjs.org/docs/use-static-query/
 */ import type { FC } from 'react' ; import { Helmet } from 'react-helmet' ; import { useStaticQuery , graphql } from 'gatsby' ; interface SourceProps { description ? : string ; lang ? : string ; meta ? : [ ] ; title : string ; pathname ? : string ; } const SEO = ( { description , lang , title , pathname } ) => { const { site } = useStaticQuery ( graphql `
      query {
        site {
          siteMetadata {
            siteUrl
            title
            subtitle
            description
            author
            image {
              path
              height
              width
            }
          }
        }
      }
    ` ) ; const siteUrl = site . siteMetadata . siteUrl ; const metaDescription = description || site . siteMetadata . description ; const pageTitle = `${ title ? title + ' | ' : '' }${ site . siteMetadata . title }: ${ site . siteMetadata . subtitle }` ; const imagePath = siteUrl + site . siteMetadata . image . path ; const pagePath = pathname ? siteUrl + pathname : siteUrl ; return ( < Helmet htmlAttributes = { { lang , } } > < title > { pageTitle } < /title> < meta name = "description" content = { metaDescription } / > < link rel = "canonical" href = { pagePath } / > < meta property = "og:url" content = { pagePath } / > < meta property = "og:type" content = "website" / > < meta property = "og:title" content = { pageTitle } / > < meta property = "og:description" content = { metaDescription } / > < meta property = "og:image" content = { imagePath } / > < meta property = "og:image:height" content = { site . siteMetadata . image . height } / > < meta property = "og:image:width" content = { site . siteMetadata . image . width } / > < meta name = "twitter:card" content = "summary_large_image" / > < meta name = "twitter:creator" content = { site . siteMetadata . author } / > < meta name = "twitter:title" content = { pageTitle } / > < meta name = "twitter:description" content = { metaDescription } / > < meta name = "twitter:image" content = { site . siteMetadata . image } / > < /Helmet>); } ; SEO . defaultProps = { lang : `en` , meta : [ ] , description : `` , } ; export default SEO ;