Nuxt/examples/i18n/middleware/i18n.js

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export default function ({ isHMR, app, store, route, params, error, redirect }) {
// If middleware is called from hot module replacement, ignore it
if (isHMR) return
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// Get locale from params
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const locale = params.lang || 'en'
if (store.state.locales.indexOf(locale) === -1) {
return error({ message: 'This page could not be found.', statusCode: 404 })
}
// Set locale
store.commit('SET_LANG', locale)
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app.i18n.locale = store.state.locale
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// If route is /en/... -> redirect to /...
if (locale === 'en' && route.fullPath.indexOf('/en') === 0) {
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return redirect(route.fullPath.replace(/^\/en/, '/'))
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}
}