Q:

What does @nuxtjs mean in my eslintrc file?

I am new to Nuxt.js and trying to understand what is meant by the following line (@nuxtjs) in my .eslintrc.js file:
extends: [
'@nuxtjs', <-------------------------- is this an alias?
'plugin:prettier/recommended'
],

A:

it just means that your eslint configuration will extend a eslint configuration named @nuxtjs ( e.g. it will have some preconfigured rules )
Here is github for eslint nuxt config https://github.com/nuxt/eslint-config

