How to Identify if its in production mode or dev invironment?

[JenuelDev]

So I have this code something like this in my app.js

const isDevelopment = process.env.NODE_ENV == "development" ? true : false;

createInertiaApp({
    // in development use require for faster render, when in prod, code split so that it only fetch resources that is needed
    resolve: (name) => (isDevelopment ? require(`./Pages/${name}`) : import(`./Pages/${name}`)),
    setup({ el, App, props, plugin }) {
        new Vue({
            render: (h) => h(App, props),
        }).$mount(el);
    },
});

I run yarn mix and yarn prod but it still runs the require(), I like to run the import if its in production mode.