fix: resolve an issue where previews would not show if the default URL led to a 404 page

Types of changes

[ ] Chore (a non-breaking change which is related to package maintenance)
[x] Bug fix (a non-breaking change which fixes an issue)
[ ] New feature (a non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR fixes a bug where preview content would not appear when using a shared preview link.

If @prismicio/next's redirectToPreviewURL() defaultURL option pointed to a page that doesn't exist (i.e. a 404 status code), the page would not be refreshed. This happens because <PrismicPreview> checked for res.ok when fetching the /api/preview endpoint.

Rather than check for res.ok, which may result in a 404 despite properly updating preview data, <PrismicPreview> now checks that res.redirected is true.

Checklist:

[ ] My change requires an update to the official documentation.
[x] All TSDoc comments are up-to-date and new ones have been added where necessary.
[x] All new and existing tests are passing.

🐳

Path	Size
./dist/index.cjs	5.96 KB (+0.09% 🔺)
./dist/index.js	2.74 KB (+0.22% 🔺)

prismicio / prismic-next