The tutorial linked below will guide you through building an internationalized (i18n) Nextjs application using the latest v4 version of Lingui.js.

Completing the tutorial should result in a good understanding of the Lingui internationalization process as well as a fully functioning multi-language Typescript sample application with:

• Support for three languages (English, Dutch and Pseudo)
• Nextjs subpath routing
• Translation files in *.po format, ready for super smooth Crowdin online translations
• A language switcher (optionally)
• Working test suite integration using Vitest and the Lingui swc-plugin

https://bravo-kernel.com/blog/2023/05/how-to-build-a-fully-internationalized-nextjs-application-using-lingui-v4