gatsby-node.js

exports.createResolvers = ({ actions, getCache, createNodeId, createResolvers }) => {
  const { createNode } = actions
  createResolvers({
    Drupal_MediaImage: {
      gatsbyImageFile: {
        type: `File`,
        resolve(source) {

          return createRemoteFileNode({
            url: source.fieldMediaImage.url,
            getCache,
            createNode,
            createNodeId,
            httpHeaders: {
              Authorization: `Basic ${process.env.DRUPAL_AUTH_TOKEN}`,
            },
          })
        },
      },
    },
  })
}