gatsby-node.js

exports.onCreateNode = async ({
  node,
  actions: { createNode },
  createNodeId,
  getCache,
}) => {
  if (node.remoteTypeName === 'Asset' && node.mimeType.includes('image/')) {
    const fileNode = await createRemoteFileNode({
      url: node.url,
      parentNodeId: node.id,
      createNode,
      createNodeId,
      getCache,
    })

    if (fileNode) node.remoteFile = fileNode.id
  }
}

exports.createSchemaCustomization = ({ actions }) => {
  actions.createTypes(`
    type GraphCMS_Asset {
      remoteFile: File @link
    }
  `)
}