Query for image files in directory with source gatsby-file-system

query-images-gatsby-source-filesystem.md

query {
  allFile(filter:{relativeDirectory: {eq: "demo-map"}}) {
    edges {
      node {
        absolutePath
        name
        relativePath
        relativeDirectory
        extension
        childImageSharp {
          fixed(width: 250) {
            src
          }
        }
      }
    }
  }
}