gatsby-browser.jsx

const React = require("react")
const Layout = require("./src/components/layout")
// Logs when the client route changes
exports.onRouteUpdate = ({ location, prevLocation }) => {
  console.log("new pathname", location.pathname)
  console.log("old pathname", prevLocation ? prevLocation.pathname : null)
}
// Wraps every page in a component
exports.wrapPageElement = ({ element, props }) => {<Layout {...props}>{element}</Layout>