feat: add models package

packages/models/src/Domain/Syncable/UserPrefs/UserPrefs.ts

@@ -0,0 +1,20 @@
+import { DecryptedItem } from '../../Abstract/Item/Implementations/DecryptedItem'
+import { ContentType } from '@standardnotes/common'
+import { Predicate } from '../../Runtime/Predicate/Predicate'
+import { PrefKey, PrefValue } from './PrefKey'
+
+export class SNUserPrefs extends DecryptedItem {
+  static singletonPredicate = new Predicate('content_type', '=', ContentType.UserPrefs)
+
+  override get isSingleton(): true {
+    return true
+  }
+
+  override singletonPredicate(): Predicate<SNUserPrefs> {
+    return SNUserPrefs.singletonPredicate
+  }
+
+  getPref<K extends PrefKey>(key: K): PrefValue[K] | undefined {
+    return this.getAppDomainValue(key)
+  }
+}