fix: check content-type before applying spa patch (closes #597)

Jacky Zhao

2023-11-17 3f0be7fbe470500a57c457ad1d1c039175330697

 index.d.ts

@@ -5,7 +5,7 @@

// dom custom event
interface CustomEventMap {
  nav: CustomEvent<{ url: CanonicalSlug }>
  nav: CustomEvent<{ url: FullSlug }>
}

declare const fetchData: Promise<ContentIndex>