Add feature to set a default language

[guiihlopes]

It would be nice if have some way to pass a param like queryName to set a default language. So, if there isn't a cookie already set and if you pass a prop like: defaultLanguage, then set the default language. I think it could be a very nice feature.

Example:

const languages = ['en', 'pt']

server.use(
    requestLanguage({
      languages: languages,
      queryName: 'lang',
      defaultLanguage: 'en',
      cookie: {
        name: 'DEFAULT_LANGUAGE',
        options: { maxAge: 24 * 3600 * 1000 }
      }
    })
  )

The first time if there is no cookie already set, it would be 'en', ignoring the accept language...

WDYT about it?

[visurel]

Just checked the source code of accept-language, looks like the first value set in the languages-array is automatically set as default if nothing else matches. But indeed, it would be a lot clearer if it would just be a seperate param.

[tinganho]

@visurel is right. The first language is the default one. I'm not sure if adding it as a separate property makes sense. Because the languages array is sort of a priority list.

[guiihlopes]

I was saying to ignore the accept-language if the default language param is set and there's no DEFAULT_LANGUAGE cookie. In this way, no matter which accept-language matches, it would return the default language. I know that I can do it already by myself, but I think it would be nice to flexibilize and improve the package with this feature.

[tinganho]

Okay you want to turn off the accept language negotiation? And always default to whatever is being set as default except when the language cookie is set?

[guiihlopes]

Yes, you got it