Cannot set property 'toJSON' of undefined when using react-i18next example

[szczepanbarszczowski]

Examples bug report

Example name

with-react-i18next

Describe the bug

I have problem when running dev server. I've got Cannot set property 'toJSON' of undefined on server. It looks like there is no i18n on request in file i18n.js. Translation doesn't work. On production build everything works well. I've tried most of solutions on Github regarding react-i18next example and always getting this crappy undefined error. Any help will be appreciated.

To Reproduce

Just clone this repository: https://github.com/szczepanbarszczowski/nextjs-starter

Expected behavior

It should work without an error.

Screenshots

System information

• OS: Mac OS Mojave
• Browser (if applies) Chrome 68
• Version of Next.js: 6.1.2

[szczepanbarszczowski]

I've tried @next/cannary but still same error. Any thoughts why i18n is undefined on server?

[danielr18]

It's because you are not using your custom server on dev, try setting your dev script to "dev": "node server.js".

[szczepanbarszczowski]

@danielr18 You're right. Thank a lot man. It works well.