nuxt.config.js

const routerBase =
  process.env.DEPLOY_ENV === 'GH_PAGES'
    ? {
        router: {
          base: '/portfolio/'
        }
      }
    : {}

export default {
  mode: 'spa',
  srcDir: 'src/',
  ...routerBase,
  /*
   ** Headers of the page
   */
  head: {
    title: process.env.npm_package_name || '',
    meta: [
      { charset: 'utf-8' },
      { name: 'viewport', content: 'width=device-width, initial-scale=1' },
      {
        hid: 'description',
        name: 'description',
        content: process.env.npm_package_description || ''
      }
    ],
    link: [
      { rel: 'icon', type: 'image/x-icon', href: '/favicon.ico' },
      {
        rel: 'stylesheet',
        href: 'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.9.0/css/all.min.css',
        integrity: 'sha256-UzFD2WYH2U1dQpKDjjZK72VtPeWP50NoJjd26rnAdUI=',
        crossorigin: 'anonymous'
      }
    ],
    script: [{ src: 'https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver' }]
  },
  /*
   ** Customize the progress-bar color
   */
  loading: { color: '#fff' },
  /*
   ** Global CSS
   */
  css: ['~/assets/sass/style.sass'],
  /*
   ** Plugins to load before mounting the App
   */
  plugins: [{ src: '~/plugins/aos' }, { src: '~/plugins/scrollTo' }],
  /*
   ** Nuxt.js dev-modules
   */
  buildModules: [
    // Doc: https://github.com/nuxt-community/eslint-module
    '@nuxtjs/eslint-module',
    // Doc: https://github.com/nuxt-community/stylelint-module
    '@nuxtjs/stylelint-module'
  ],
  /*
   ** Nuxt.js modules
   */
  modules: [
    // Doc: https://axios.nuxtjs.org/usage
    '@nuxtjs/axios',
    '@nuxtjs/pwa',
    // Doc: https://github.com/nuxt-community/dotenv-module
    '@nuxtjs/dotenv',
    '@nuxtjs/style-resources'
  ],
  /*
   ** Axios module configuration
   ** See https://axios.nuxtjs.org/options
   */
  axios: {},

  styleResources: {
    sass: ['~/assets/sass/_mixins.sass']
  },

  /*
   ** Build configuration
   */
  build: {
    postcss: {
      preset: {
        features: {
          customProperties: false
        }
      }
    },
    /*
     ** You can extend webpack config here
     */
    extend(config, ctx) {}
  }
}