Strictly typed `useLocale`

[amannn]

Is your feature request related to a problem? Please describe.

Currently, useLocale returns a string. This is mostly fine, but APIs that ask for strictly typed locales (e.g. locale of getPathname currently) make this not easy to assign.

The reason for this is that the locales are passed to a navigation factory function, but not useLocale (which is imported from next-intl).

Describe the solution you'd like

Either all APIs should use a strictly typed locale or none—a mixture requires workarounds.

Similar to strictly typed messages and formats, we could allow the user to provide the list of locales globally. This would work for both global APIs like useLocale as well as the navigation APIs. At this point we could consider registering all global shapes under a single type namespace.

[amannn]

This (and a bit more) is coming in v4: #1495

[cupofjoakim]

@amannn I was looking around for some easy contributions I could make, but it seems this one is fixed, right?

[amannn]

Yep, you're right—thanks for the hint! Going to close this.

I was looking around for some easy contributions I could make

I just looked around on the issue tracker, I think a lot of the low-hanging fruits are already solved at this point.

Some potentially smaller topics are these two:

• Localized pathname type error when reached a certain number of objects  #726
• Support for NextAuth v5 multiple middleware #596

This is a medium-sized feature, will require a bit of design and research:

• Globally register error handling #1285

And then there are some bigger topics I'm planning to work on in the coming months, but there is some significant research and development effort involved:

• Automatic tree-shaking of messages #1
• Ahead-of-time compilation of messages #962
• Message extraction #1904

If you're interested in contributing to something, definitely let me know or just comment on relevant issues—the more the merrier! 🙂

Of course, ongoing issue triage and answering questions is also always a big topic with pretty much daily need for it.