typescript fix

Author: gregsadetsky

lib/terminal.ts

@@ -371,8 +371,9 @@ export class Terminal implements ITerminalCore {
       parent.appendChild(this.textarea);
 
       // iOS requires explicit focus from touch event to show keyboard
-      this.textarea.addEventListener('touchstart', () => {
-        this.textarea.focus();
+      const textarea = this.textarea;
+      textarea.addEventListener('touchstart', () => {
+        textarea.focus();
       });
 
       // Create renderer