nuxt i18n middleware which don't need to format the nuxt-link url, hack

i18n-middleware.js

import LOCALES from '~/lang/locales'

const debug = require('debug')('auth:server:i18n:middleware')

const DEFAULT_LOCALE = 'en'

export default function (context) {
  const { app, store, route, error, redirect, hotReload, from } = context;

  // Check if middleware called from hot-reloading, ignore
  if (hotReload) return
  // Get locale from params
  let locale = DEFAULT_LOCALE
  LOCALES.forEach(l => {
    const regexp = new RegExp(`^/${l.code}`)
    if (route.path.match(regexp)) {
      locale = l.code
    }
  })
  // debug(locale, app.i18n.locale)
  if (LOCALES.findIndex(l => l.code === locale) === -1) {
    return error({ message: 'Page not found.', statusCode: 404 })
  }

  const routePath = route.path

  if (locale === app.i18n.locale) {
    if (routePath.indexOf(`/${DEFAULT_LOCALE}`) === 0) {
      const regexp = new RegExp(`^/${DEFAULT_LOCALE}`)
      return redirect(route.fullPath.replace(regexp, '/'))
    } else {
      return;
    }
  }
  // /zh/register  -> /register
  if (locale !== app.i18n.locale) {
    // If route is /<DEFAULT_LOCALE>/... -> redirect to /...
    if (locale === DEFAULT_LOCALE) {
      if (routePath.indexOf(`/${DEFAULT_LOCALE}`) === 0) {
        const regexp = new RegExp(`^/${DEFAULT_LOCALE}`)
        return redirect(route.fullPath.replace(regexp, ''))
      } else {
        //  If route /LOCALE/xxxPage jump to /xxxPage
        if (from.name == route.name.replace(locale, app.i18n.locale)) {
          return;
        } else {
          // If route /LOCALE/xxxPage jump to /yyyPage -> redirect to /LOCALE/yyyPage
          // this hack the nuxt-link url
          return redirect({ path: `/${app.i18n.locale}${routePath}`, query: route.query });
        }
      }
    }
    if (routePath.indexOf(`/${locale}`) === 0) {
      return;
    } else {
      return redirect({ path: `/${app.i18n.locale}${routePath}`, query: route.query })
    }
  }

}