gatsby-browser.js

/**
 * Implement Gatsby's Browser APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/browser-apis/
 */

exports.onInitialClientRender = () => {
    if ('onGatsbyInitialClientRender' in window && typeof window.onGatsbyInitialClientRender === 'function') {
        window.onGatsbyInitialClientRender();
    }
};

exports.onRouteUpdate = () => {
    if ('onGatsbyRouteUpdate' in window && typeof window.onGatsbyRouteUpdate === 'function') {
        window.onGatsbyRouteUpdate();
    }
};