refactor: application dependency management (#2363)

packages/snjs/lib/Application/Dependencies/isDeinitable.ts

@@ -0,0 +1,14 @@
+export function isDeinitable(service: unknown): service is { deinit(): void } {
+  if (!service) {
+    throw new Error('Service is undefined')
+  }
+  return typeof (service as { deinit(): void }).deinit === 'function'
+}
+
+export function canBlockDeinit(service: unknown): service is { blockDeinit(): Promise<void> } {
+  if (!service) {
+    throw new Error('Service is undefined')
+  }
+
+  return typeof (service as { blockDeinit(): Promise<void> }).blockDeinit === 'function'
+}