feat: add snjs package

packages/snjs/lib/Migrations/Versions/2_42_0.ts

@@ -0,0 +1,30 @@
+import { ContentType } from '@standardnotes/common'
+import { ApplicationStage } from '@standardnotes/services'
+import { FeatureIdentifier } from '@standardnotes/features'
+import { Migration } from '@Lib/Migrations/Migration'
+import { SNTheme } from '@standardnotes/models'
+
+const NoDistractionIdentifier = 'org.standardnotes.theme-no-distraction' as FeatureIdentifier
+
+export class Migration2_42_0 extends Migration {
+  static override version(): string {
+    return '2.42.0'
+  }
+
+  protected registerStageHandlers(): void {
+    this.registerStageHandler(ApplicationStage.FullSyncCompleted_13, async () => {
+      await this.deleteNoDistraction()
+      this.markDone()
+    })
+  }
+
+  private async deleteNoDistraction(): Promise<void> {
+    const themes = (this.services.itemManager.getItems(ContentType.Theme) as SNTheme[]).filter((theme) => {
+      return theme.identifier === NoDistractionIdentifier
+    })
+
+    for (const theme of themes) {
+      await this.services.itemManager.setItemToBeDeleted(theme)
+    }
+  }
+}