refactor: improve device interface types (#996)

app/assets/javascripts/Device/DesktopWebCommunication.ts

@@ -0,0 +1,44 @@
+import { DecryptedTransferPayload } from '@standardnotes/snjs'
+
+/** Receives communications emitted by Web Core. This would be the Desktop client. */
+export interface WebCommunicationReceiver {
+  localBackupsCount(): Promise<number>
+
+  viewlocalBackups(): void
+
+  deleteLocalBackups(): Promise<void>
+
+  syncComponents(payloads: unknown[]): void
+
+  onMajorDataChange(): void
+
+  onInitialDataLoad(): void
+
+  onSignOut(): void
+
+  onSearch(text?: string): void
+
+  downloadBackup(): void | Promise<void>
+
+  get extensionsServerHost(): string
+}
+
+/** Receives communications emitted by the desktop client. This would be Web Core. */
+export interface DesktopCommunicationReceiver {
+  updateAvailable(): void
+
+  windowGainedFocus(): void
+
+  windowLostFocus(): void
+
+  onComponentInstallationComplete(
+    componentData: DecryptedTransferPayload,
+    error: unknown,
+  ): Promise<void>
+
+  requestBackupFile(): Promise<string | undefined>
+
+  didBeginBackup(): void
+
+  didFinishBackup(success: boolean): void
+}