Fix tslint error

editors/code/src/commands/watch_status.ts

@@ -0,0 +1,37 @@
+import * as timers from 'timers';
+import * as vscode from 'vscode';
+
+const spinnerFrames = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏'];
+
+export class StatusDisplay {
+    private i = 0;
+    private statusBarItem: vscode.StatusBarItem;
+    private timer?: NodeJS.Timeout;
+
+    constructor(subscriptions: vscode.Disposable[]) {
+        this.statusBarItem = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left, 10);
+        subscriptions.push(this.statusBarItem);
+        this.statusBarItem.hide();
+    }
+
+    public show() {
+        this.timer = this.timer || setInterval(() => {
+            this.statusBarItem!.text = 'cargo check ' + this.frame();
+        }, 300);
+
+        this.statusBarItem!.show();
+    }
+
+    public hide() {
+        if (this.timer) {
+            clearInterval(this.timer);
+            this.timer = undefined;
+        }
+
+        this.statusBarItem!.hide();
+    }
+
+    private frame() {
+        return spinnerFrames[this.i = ++this.i % spinnerFrames.length];
+    }
+}