Error after migrate to Next.js 9.0.0

[aralroca]

Describe the bug

After migrate to the latest version of Next.js, the next-i18next package is throwing an error after npm run dev

TypeError: Cannot read property 'detection' of undefined

My i18n config:

{
  "defaultLanguage": "es",
  "localeExtension": "json",
  "localePath": "static/locales",
  "localeStructure": "{{lng}}/{{ns}}",
  "localeSubpaths": "all",
  "otherLanguages": [
    "es",
    "en",
    "de",
    "it",
    "fr"
  ],
  "pluralSeparator": "_",
  "simplifyPluralSuffix": true,
  "detection": {
    "order": [
      "querystring",
      "cookie",
      "navigator"
    ]
  }
}

Import using common.js

const NextI18Next = require('next-i18next').default

Occurs in next-i18next version

[email protected]

Steps to reproduce

Just migrate from [email protected] to [email protected] and run the app with npm run dev.

Expected behaviour

I expect to run the app without any crash. As in next 8.1.0 version.

Screenshots

OS (please complete the following information)

• Device: MBP 2018 13
• Node: v11.8.0

[isaachinman]

I believe the NextJs team have changed some of their Babel internals. I'll take a look when I have time.

[aralroca]

I realized that this is happening only using this in my next.config.js:

const withTM = require('next-transpile-modules')

// ...

const hasModuleTranspilation = withTM({
  transpileModules: ['next-i18next'],
  ...nextConfig
})

That I did to solve this another problem commented here: #290 (comment)

So I guess is not an issue of this library. I can close it.

[isaachinman]

Ah okay, makes sense. It does indeed sound like a module problem. Good luck.