Make ParamMatcher return a promise

[pierre-H]

Hello,

Thank you a lot for SvelteKit ! What a project !

It would be great to allow ParamMatcher to return a Promise so we could check in database for slugs for example.

[rgevrek]

Absolutely aggree on this idea,

trying for headless WP project to differentiate between usual pages for contact form, data privacy etc. and post pages, so that I need to lockup for slugs against an API.

[eytanProxi]

@Rich-Harris : is the blocking because ParamMatcher is runed in the browser?