v4: sitemap.xml missing

[DanielRuf]

With the new Next setup, there is no sitemap.xml file generated.

See https://nextjs.org/docs/app/api-reference/file-conventions/metadata/sitemap#generating-a-sitemap-using-code-js-ts for context.

[mathiasschopmans]

I'm not sure of the value of having a sitemap.xml. Google says you might not need an XML sitemap if:

• Your site is comprehensively linked internally. ✅
• You don’t have many media files (video, image) or news pages that you need to appear in the index. ✅
• Your site is “small”: By small, we mean about 500 pages or less on your site. ✅ (AOE's Techradar has around ~250 pages)

https://builtin.com/marketing/sitemap-xml-overrated

The v3 implementation did not align to the sitemap.xml spec, as it created relative URLs.

<loc>: URL of the page. This URL must begin with the protocol (such as http) and end with a trailing slash, if your web server requires it. This value must be less than 2,048 characters.

https://www.sitemaps.org/protocol.html#locdef

ℹ️ To generate a valid sitemap.xml, we need to introduce a new setting: config.baseUrl.

[mathiasschopmans]

I created a PR. Does this meet your expectation, @DanielRuf?