Introduce removeElementFromParent helper

src/browser/AccessibilityManager.ts

@@ -12,6 +12,7 @@ import { addDisposableDomListener } from 'browser/Lifecycle';
 import { Disposable } from 'common/Lifecycle';
 import { ScreenDprMonitor } from 'browser/ScreenDprMonitor';
 import { IRenderService } from 'browser/services/Services';
+import { removeElementFromParent } from 'browser/Dom';
 
 const MAX_ROWS_TO_READ = 20;
 
@@ -106,7 +107,7 @@ export class AccessibilityManager extends Disposable {
 
   public dispose(): void {
     super.dispose();
-    this._terminal.element?.removeChild(this._accessibilityTreeRoot);
+    removeElementFromParent(this._accessibilityTreeRoot);
     this._rowElements.length = 0;
   }
 
@@ -240,9 +241,7 @@ export class AccessibilityManager extends Disposable {
 
     // Only detach/attach on mac as otherwise messages can go unaccounced
     if (isMac) {
-      if (this._liveRegion.parentNode) {
-        this._accessibilityTreeRoot.removeChild(this._liveRegion);
-      }
+      removeElementFromParent(this._liveRegion);
     }
   }
 

src/browser/Dom.ts

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2020 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+export function removeElementFromParent(...elements: (HTMLElement | undefined)[]): void {
+  for (const e of elements) {
+    e?.parentElement?.removeChild(e);
+  }
+}

src/browser/renderer/BaseRenderLayer.ts

@@ -16,6 +16,7 @@ import { CellData } from 'common/buffer/CellData';
 import { IBufferService, IOptionsService } from 'common/services/Services';
 import { throwIfFalsy } from 'browser/renderer/RendererUtils';
 import { channels, color, rgba } from 'browser/Color';
+import { removeElementFromParent } from 'browser/Dom';
 
 export abstract class BaseRenderLayer implements IRenderLayer {
   private _canvas: HTMLCanvasElement;
@@ -60,7 +61,7 @@ export abstract class BaseRenderLayer implements IRenderLayer {
   }
 
   public dispose(): void {
-    this._canvas.parentElement?.removeChild(this._canvas);
+    removeElementFromParent(this._canvas);
     this._charAtlas?.dispose();
   }
 

src/browser/renderer/dom/DomRenderer.ts

@@ -12,6 +12,7 @@ import { ICharSizeService } from 'browser/services/Services';
 import { IOptionsService, IBufferService } from 'common/services/Services';
 import { EventEmitter, IEvent } from 'common/EventEmitter';
 import { color } from 'browser/Color';
+import { removeElementFromParent } from 'browser/Dom';
 
 const TERMINAL_CLASS_PREFIX = 'xterm-dom-renderer-owner-';
 const ROW_CONTAINER_CLASS = 'xterm-rows';
@@ -98,10 +99,7 @@ export class DomRenderer extends Disposable implements IRenderer {
 
     // Outside influences such as React unmounts may manipulate the DOM before our disposal.
     // https://github.com/xtermjs/xterm.js/issues/2960
-    this._rowContainer.parentElement?.removeChild(this._rowContainer);
-    this._selectionContainer.parentElement?.removeChild(this._selectionContainer);
-    this._themeStyleElement.parentElement?.removeChild(this._themeStyleElement);
-    this._dimensionsStyleElement.parentElement?.removeChild(this._dimensionsStyleElement);
+    removeElementFromParent(this._rowContainer, this._selectionContainer, this._themeStyleElement, this._dimensionsStyleElement);
 
     super.dispose();
   }