fix(next): static live preview url corrupt after save (#13949)

As of #13631, statically defined live preview URLs become corrupt after
the first save.

For example, if you define your URL as a string like this:

```ts
import type { CollectionConfig } from 'payload'

const MyCollection: CollectionConfig = {
  // ...
  admin: {
    livePreview: {
      url: '/hello-world'
    }
  }
}
```

On initial load, the iframe's src will evaluate to `.../hello-world` as
expected, but from the first save onward, the url becomes
`.../undefined`.

This is because for statically defined URLs, the `livePreviewURL`
property does not exist on the response. Despite this, we set it into
state as undefined. This is true for both collections and globals.

Initially reported on Discord here:
https://discord.com/channels/967097582721572934/967097582721572937/1421166976113442847

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1211478736160152

packages/ui/src/views/Edit/index.tsx

@@ -353,7 +353,7 @@ export function DefaultEditView({
           setDocumentIsLocked(false)
         }
 
-        if (isLivePreviewEnabled) {
+        if (livePreviewURL) {
           setLivePreviewURL(livePreviewURL)
         }
 

test/live-preview/collections/StaticURL.ts

@@ -0,0 +1,16 @@
+import type { CollectionConfig } from 'payload'
+
+export const StaticURLCollection: CollectionConfig = {
+  slug: 'static-url',
+  admin: {
+    livePreview: {
+      url: '/live-preview/hello-world',
+    },
+  },
+  fields: [
+    {
+      name: 'title',
+      type: 'text',
+    },
+  ],
+}

test/live-preview/config.ts

@@ -11,6 +11,7 @@ import { Pages } from './collections/Pages.js'
 import { Posts } from './collections/Posts.js'
 import { SSR } from './collections/SSR.js'
 import { SSRAutosave } from './collections/SSRAutosave.js'
+import { StaticURLCollection } from './collections/StaticURL.js'
 import { Tenants } from './collections/Tenants.js'
 import { Users } from './collections/Users.js'
 import { Footer } from './globals/Footer.js'
@@ -56,6 +57,7 @@ export default buildConfigWithDefaults({
     Categories,
     Media,
     CollectionLevelConfig,
+    StaticURLCollection,
   ],
   globals: [Header, Footer],
   onInit: seed,

test/live-preview/e2e.spec.ts

@@ -164,6 +164,21 @@ describe('Live Preview', () => {
     await expect.poll(async () => iframe.getAttribute('src')).toMatch(/\/live-preview/)
   })
 
+  test('collection — retains static URL across edits', async () => {
+    const util = new AdminUrlUtil(serverURL, 'static-url')
+    await page.goto(util.create)
+    await saveDocAndAssert(page)
+    await toggleLivePreview(page, { targetState: 'on' })
+
+    const iframe = page.locator('iframe.live-preview-iframe')
+    await expect.poll(async () => iframe.getAttribute('src')).toMatch(/\/live-preview\/hello/)
+
+    const titleField = page.locator('#field-title')
+    await titleField.fill('New Title')
+    await saveDocAndAssert(page)
+    await expect.poll(async () => iframe.getAttribute('src')).toMatch(/\/live-preview\/hello/)
+  })
+
   test('collection csr — iframe reflects form state on change', async () => {
     await goToCollectionLivePreview(page, pagesURLUtil)
 

test/live-preview/payload-types.ts

@@ -78,6 +78,7 @@ export interface Config {
     categories: Category;
     media: Media;
     'collection-level-config': CollectionLevelConfig;
+    'static-url': StaticUrl;
     'payload-locked-documents': PayloadLockedDocument;
     'payload-preferences': PayloadPreference;
     'payload-migrations': PayloadMigration;
@@ -93,6 +94,7 @@ export interface Config {
     categories: CategoriesSelect<false> | CategoriesSelect<true>;
     media: MediaSelect<false> | MediaSelect<true>;
     'collection-level-config': CollectionLevelConfigSelect<false> | CollectionLevelConfigSelect<true>;
+    'static-url': StaticUrlSelect<false> | StaticUrlSelect<true>;
     'payload-locked-documents': PayloadLockedDocumentsSelect<false> | PayloadLockedDocumentsSelect<true>;
     'payload-preferences': PayloadPreferencesSelect<false> | PayloadPreferencesSelect<true>;
     'payload-migrations': PayloadMigrationsSelect<false> | PayloadMigrationsSelect<true>;
@@ -336,7 +338,7 @@ export interface Page {
     root: {
       type: string;
       children: {
-        type: string;
+        type: any;
         version: number;
         [k: string]: unknown;
       }[];
@@ -351,7 +353,7 @@ export interface Page {
     root: {
       type: string;
       children: {
-        type: string;
+        type: any;
         version: number;
         [k: string]: unknown;
       }[];
@@ -382,7 +384,7 @@ export interface Page {
           root: {
             type: string;
             children: {
-              type: string;
+              type: any;
               version: number;
               [k: string]: unknown;
             }[];
@@ -885,6 +887,16 @@ export interface CollectionLevelConfig {
   updatedAt: string;
   createdAt: string;
 }
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "static-url".
+ */
+export interface StaticUrl {
+  id: string;
+  title?: string | null;
+  updatedAt: string;
+  createdAt: string;
+}
 /**
  * This interface was referenced by `Config`'s JSON-Schema
  * via the `definition` "payload-locked-documents".
@@ -927,6 +939,10 @@ export interface PayloadLockedDocument {
     | ({
         relationTo: 'collection-level-config';
         value: string | CollectionLevelConfig;
+      } | null)
+    | ({
+        relationTo: 'static-url';
+        value: string | StaticUrl;
       } | null);
   globalSlug?: string | null;
   user: {
@@ -1468,6 +1484,15 @@ export interface CollectionLevelConfigSelect<T extends boolean = true> {
   updatedAt?: T;
   createdAt?: T;
 }
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "static-url_select".
+ */
+export interface StaticUrlSelect<T extends boolean = true> {
+  title?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
 /**
  * This interface was referenced by `Config`'s JSON-Schema
  * via the `definition` "payload-locked-documents_select".