nuxt.config.js

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

export default {
  ...routerBase,
  // Disable server-side rendering (https://go.nuxtjs.dev/ssr-mode)
  ssr: false,

  // Target (https://go.nuxtjs.dev/config-target)
  target: 'static',

  // Global page headers (https://go.nuxtjs.dev/config-head)
  head: {
    title: 'takeshihatae',
    meta: [
      { charset: 'utf-8' },
      { name: 'viewport', content: 'width=device-width, initial-scale=1' },
      { hid: 'description', name: 'description', content: '' }
    ],
    link: [
      { rel: 'icon', type: 'image/x-icon', href: '/favicon.ico' }
    ]
  },

  // Global CSS (https://go.nuxtjs.dev/config-css)
  css: ['~/assets/global.css'],

  // Plugins to run before rendering page (https://go.nuxtjs.dev/config-plugins)
  plugins: [{ src: '@/plugins/routerOption.js', ssr: false }],

  // Auto import components (https://go.nuxtjs.dev/config-components)
  components: true,

  // Modules for dev and build (recommended) (https://go.nuxtjs.dev/config-modules)
  buildModules: [
  ],

  // Modules (https://go.nuxtjs.dev/config-modules)
  modules: [],

  // Build Configuration (https://go.nuxtjs.dev/config-build)
  build: {
    filenames: {
      app: ({ isDev }) => isDev ? '[name].[hash].js' : '[chunkhash].js',
      chunk: ({ isDev }) => isDev ? '[name].[hash].js' : '[chunkhash].js'
    },
    postcss: {
      plugins: {
        'postcss-url': false,
        'postcss-nested': {},
        'postcss-import': {},
        'postcss-simple-vars': {},
        'postcss-breakpoints': {},
        'postcss-responsive-type': {},
      },
      preset: {
        autoprefixer: {
          grid: true
        }
      }
    }
  },

  generate: {
    fallback: true
  }
}