refactor: format and lint codebase (#971)

app/assets/javascripts/Services/StatusManager.ts

@@ -0,0 +1,30 @@
+import { removeFromArray } from '@standardnotes/snjs'
+
+type StatusCallback = (string: string) => void
+
+export class StatusManager {
+  private _message = ''
+  private observers: StatusCallback[] = []
+
+  get message(): string {
+    return this._message
+  }
+
+  setMessage(message: string) {
+    this._message = message
+    this.notifyObservers()
+  }
+
+  onStatusChange(callback: StatusCallback) {
+    this.observers.push(callback)
+    return () => {
+      removeFromArray(this.observers, callback)
+    }
+  }
+
+  private notifyObservers() {
+    for (const observer of this.observers) {
+      observer(this._message)
+    }
+  }
+}