Using championswimmer/vuex-module-decorators with nuxt can be a bit confusing, this project is a boilerplate with the minimal code demostrating how use nuxt vuex typescript and tailwind
Nuxt.js TypeScript project
# install dependencies
$ npm install # Or yarn install
# serve with hot reload at localhost:3000
$ npm run dev
# build for production and launch server
$ npm run build
$ npm start
# generate static project
$ npm run generate
For detailed explanation on how things work, checkout the Nuxt.js docs.