import React from "react" ; import Helmet from "react-helmet" ; import { StaticQuery , graphql } from "gatsby" ; const detailsQuery = graphql `
  query DefaultSEOQuery {
    site {
      siteMetadata {
        title
        description
        author
        sitePath
      }
    }
  }
` ; type Props = { title : string ; lang ? : string ; description ? : string ; meta ? : any [ ] ; keywords ? : string [ ] ; noindex ? : boolean ; } ; type ChildProps = Props & { data : { site : { siteMetadata : { title : string ; description ? : string ; author ? : string ; sitePath : string ; } ; } ; } ; } ; export const SEO = ( { data , description , lang , meta = [ ] , keywords = [ ] , title , noindex , } ) : JSX . Element => { const metaDescription = description || data . site . siteMetadata . description ; return ( < Helmet htmlAttributes = { { lang , } } title = { title } titleTemplate = { `%s | ${ data . site . siteMetadata . title }` } meta = { [ { name : "description" , content : metaDescription , } , { property : "og:title" , content : title , } , { property : "og:description" , content : metaDescription , } , { property : "og:type" , content : "website" , } , { property : "og:image" , content : `https://${ data . site . siteMetadata . sitePath }/meta.png` , } , { property : "og:image:width" , content : "1200" , } , { property : "og:image:height" , content : "630" , } , { name : "twitter:card" , content : "summary" , } , { name : "twitter:creator" , content : data . site . siteMetadata . author , } , { name : "twitter:title" , content : title , } , { name : "twitter:image" , content : `https://${ data . site . siteMetadata . sitePath }/meta-avatar.png` , } , { name : "twitter:description" , content : metaDescription , } , { rel : "icon" , type : "image/png" , href : "favicon.ico" } , ] . concat ( keywords . length > 0 ? { name : "keywords" , content : keywords . join ( ", " ) , } : [ ] ) . concat ( noindex ? { property : "robots" , content : "noindex" , } : [ ] ) . concat ( meta ) } / > ) ; } ; export default ( props ) : JSX . Element => { return ( < StaticQuery query = { detailsQuery } render = { data => < SEO data = { data } { ... props } />}/ > ) ; } ;