[Major] Remove Shared State on the Server

[bertybot]

Description

Current preview mode implementation works by sharing isPreview store on the server and the client, Sveltekit docs explain some of the issues this can cause . Also more explanation in the original issue #14

Fix

isPreview is now scoped to the individual request by passing it down through locals.isPreview instead of storing it in a global store that is shared on the server. This is a breaking change as now any code using the store will not work, and have to be updated.

Other fixes

Added a building check to the hook so that prerendering can be supported, also added section to readme to outline how prerendering can be supported.

Summary of fixes

• Removed isPreview() and preview store
• Updated all example code to new pattern
• Updated PreviewBanner to check page store instead of isPreview store.
• Added Building Check to hook
• Updated pnpm
• Updated Readme

Considerations

• The example code that didn't take this pattern into account originally is bit messier now since we constantly have to pass in isPreview I tried to avoid changing the original style. I usually do this pattern cleaner using classes so we can reuse the client and preview mode can be stored.

const client = new CmsClient(isPreview)

await client.getPosts(slug)

Let me know what you prefer.

• Also I did not have access to the env variables for the CMS so I was unable to accurately test the examples. I however, tested on my setup and it works.