gatsby-node.js

// exports.createPages = async ({ actions }) => {
//   const { createPage } = actions
//   createPage({
//     path: "/using-dsg",
//     component: require.resolve("./src/templates/using-dsg.js"),
//     context: {},
//     defer: true,
//   })
// }


// Implement the Gatsby API “onCreatePage”. This is
// called after every page is created.
exports.onCreatePage = async ({ page, actions }) => {
  const { createPage } = actions

  // page.matchPath is a special key that's used for matching pages
  // only on the client.
  if (page.path.match(/^\/app/)) {
    page.matchPath = "/app/*"

    // Update the page.
    createPage(page)
  }
}

// exports.onCreateWebpackConfig = ({ plugins, actions }) => {
//   actions.setWebpackConfig({
//     plugins: [
//       plugins.define({
//         $: 'jquery',
//         jQuery: 'jquery',
//         'window.jQuery': 'jquery',
//       }),
//     ],
//   })
// }