There were a number of things wrong or could have been improved with the
[Draft Preview
Example](https://github.com/payloadcms/payload/tree/main/examples/draft-preview),
namely:
- The package.json was missing `"type": "modue"` which would throw ESM
related import errors on startup
- The preview secret was missing entirely, with pointless logic was
written to throw an error if it missing in the search params as opposed
to not matching the environment secret
- The `/next/exit-preview` route was duplicated twice
- The preview endpoint was unnecessarily querying the database for a
matching document as opposed to letting the underlying page itself 404
as needed, and it was also throwing an inaccurate error message
Some less critical changes were:
- The page query was missing the `depth` and `limit` parameters which is
best practice to optimize performance
- The logic to format search params in the preview URL was unnecessarily
complex
- Utilities like `generatePreviewPath` and `getGlobals` were
unnecessarily obfuscating simple functions
- The `/preview` and `/exit-preview` routes were unecessarily nested
within a `/next` page segment
- Payload types weren't aliased
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