Uncaught SyntaxError: The requested module '/node_modules/.vite/vue-router.js?v=b45f922f' does not provide an export named 'createRouter'
You should uninstall the current vue-router module and reinstall the latest (version 4) one which is compatible with Vue 3 by running :
npm uninstall vue-router
then
npm install vue-router@next -S