old_contents: import React from 'react'
  import ReactDisqusComments from 'react-disqus-comments'
  
  const Disqus = ({ postNode, siteMetadata }) => {
    const post = postNode.frontmatter
    const url = siteMetadata.url + postNode.fields.slug
    return (
      <ReactDisqusComments
        shortname={siteMetadata.disqusShortname}
        identifier={post.title}
        title={post.title}
        url={url}
      />
    )
  }
  
  export default Disqus
  
new_contents: import React from 'react'
  import ReactDisqusComments from 'react-disqus-comments'
  
  const Disqus = ({ postNode, siteMetadata }) => {
    const post = postNode.frontmatter
    const url = siteMetadata.url + postNode.fields.slug
    return (
      <ReactDisqusComments
        shortname={siteMetadata.disqusShortname}
        identifier={postNode.fields.slug.replace(/\/$/, '')}
        title={post.title}
        url={url}
      />
    )
  }
  
  export default Disqus
  
subject: Change Disqus post identifier to match old site