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import React from "react";
import PropTypes from "prop-types";
import { Helmet } from "react-helmet";
import { useStaticQuery, graphql } from "gatsby";
interface MetaProps {
name: string;
content: string;
}
interface SEOProps {
description: string;
lang: string;
meta: MetaProps[];
title: string;
}
function SEO({ description, lang, meta, title }: SEOProps): React.ReactElement {
const { site } = useStaticQuery(
graphql`
query {
site {
siteMetadata {
title
description
author
}
}
}
`
);
const metaDescription = description || site.siteMetadata.description;
return (
<Helmet
htmlAttributes={{
lang,
}}
title={title}
titleTemplate={`%s | ${site.siteMetadata.title}`}
meta={[
{
name: `description`,
content: metaDescription,
},
{
property: `og:title`,
content: title,
},
{
property: `og:description`,
content: metaDescription,
},
{
property: `og:type`,
content: `website`,
},
{
name: `twitter:card`,
content: `summary`,
},
{
name: `twitter:creator`,
content: site.siteMetadata.author,
},
{
name: `twitter:title`,
content: title,
},
{
name: `twitter:description`,
content: metaDescription,
},
].concat(meta)}
/>
);
}
SEO.defaultProps = {
lang: `en`,
meta: [],
description: ``,
};
SEO.propTypes = {
description: PropTypes.string,
lang: PropTypes.string,
meta: PropTypes.arrayOf(PropTypes.object),
title: PropTypes.string.isRequired,
};
export default SEO;
|
