Does i18n.changeLanguage not work any more?

[techgeniuswang]

I maintained a legacy application which used next-i18next (version 0.30.0, ).
next-i18next : 0.30.0
next.js: 7.0.3,
react: 16.14.0
In this case the next-i18next can use i18n.changeLanguage to load different language JSON file without change browser URL.

And we plan upgrade react/next.js/next-i18next to below version
next-i18next : 10.2.0
next.js: 11.1.4
react: 17.0.2

I create a fresh application by create-next-app then add next-i18next file. I found:

1. the latest version next-i18next is use locale to change language, and the locale append at last of URL like http://localhost:3000/zh
2. also if current locale equal to default locale, the "i18n.changeLanguage" can not work(http://localhost:3000/zh ). It can work only if current locale not equal to default locale (http://localhost:3000,)

here is a demo: https://3000-techgeniuswang-nextjsblo-k98dri25xg9.ws-eu29.gitpod.io/

first line button code is
<Link href='/' locale={router.locale === 'en' ? 'zh' : 'en'} > <button> {t('change-locale')} </button> </Link> <span> change router.locale, </span>

second line button code is:
<button type='button' onClick={() => i18n.changeLanguage(i18n.language === 'en' ? 'zh' : 'en')} > {t('change-locale')} </button> <span> change i18n.language</span>

my question is:

1. does next-i18next support put locale in the middle of URL? like this: http://localhost:3000/path1/path2/zh/article1, http://localhost:3000/path1/path2/japanese/article2
2. because we expect the URL would not change when switch language, so is there a way use i18n.changeLanguage when locale equal to default locale

[isaachinman]

NextJs handles locales and URLs now, out of the box. You should no longer use i18n.changeLanguage, as it will have no effect on your NextJs app.

Your specific questions regarding URLs should be directed to the NextJs repo, as next-i18next no longer controls that functionality.

[techgeniuswang]

OK, Thank you for your clarification.