Goals

1. Create SpeculationRules interface
2. Provide users ability to export SpeculationRules per page in the same manner as Metadata, Viewport can be exported.
3. Should support static and async functions
4. Should properly support path prefixing if the nextjs is set to use basePath.

Non-Goals

No response

Background

Currently, you need to add your own script with your own configuration as described in the Vercel example: https://vercel.com/guides/optimizing-hard-navigations, but I think this feature could be made even much simpler with the addition of SpeculationRules.

Proposal

The API SpeculationRules type should follow html.elements.script.type.speculationrules