new api generateStaticLocalizedUrls()

[samuelstroschein]

Context

SSG needs to know the localized URLs in advance. Sitemap generation also needs to know what localized URLs exist.

Proposal

A new generateStaticPaths() which goes through the URL patterns and returns the list of localizedUrls.

The developer provides a list of all static URLs/paths, the function will match the paths and return a list of all localized URLs.

const localizedUrls = generateStaticLocalizedUrls([
  "/example",
  "/page/blog",
  "/123/hello"
])

console.log(localizedUrls)
>> /de/example
>> /fr/example
>> ...

A sitemap generator can take the URLs and generate the sitemap. Likewise can an SSG generator statically pre-render all sites.

[mquandalle]

This will also be useful to generate <link rel="alternate" hreflang="XXX" url="XXX" /> tags