diff --git a/src/tsconfig.monaco.json b/src/tsconfig.monaco.json
index 6293f59ba2b..0fbd2240799 100644
--- a/src/tsconfig.monaco.json
+++ b/src/tsconfig.monaco.json
@@ -11,7 +11,7 @@
 		"moduleResolution": "nodenext",
 		"removeComments": false,
 		"preserveConstEnums": true,
-		"target": "ES2022",
+		"target": "ES2024",
 		"sourceMap": false,
 		"declaration": true,
 		"skipLibCheck": true
diff --git a/src/tsconfig.vscode-dts.json b/src/tsconfig.vscode-dts.json
index 3df2c2292ef..b83f686e4f3 100644
--- a/src/tsconfig.vscode-dts.json
+++ b/src/tsconfig.vscode-dts.json
@@ -13,7 +13,7 @@
 		"forceConsistentCasingInFileNames": true,
 		"types": [],
 		"lib": [
-			"ES2022"
+			"ES2024"
 		],
 	},
 	"include": [
diff --git a/src/vs/workbench/contrib/chat/common/widget/annotations.ts b/src/vs/workbench/contrib/chat/common/widget/annotations.ts
index c22c60ca430..df8564c6192 100644
--- a/src/vs/workbench/contrib/chat/common/widget/annotations.ts
+++ b/src/vs/workbench/contrib/chat/common/widget/annotations.ts
@@ -2,7 +2,6 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
-import { findLastIdx } from '../../../../../base/common/arraysFind.js';
 import { MarkdownString } from '../../../../../base/common/htmlContent.js';
 import { basename } from '../../../../../base/common/resources.js';
 import { URI } from '../../../../../base/common/uri.js';
@@ -18,7 +17,7 @@ export function annotateSpecialMarkdownContent(response: Iterable<IChatProgressR
 
 	const result: IChatProgressRenderableResponseContent[] = [];
 	for (const item of response) {
-		const previousItemIndex = findLastIdx(result, p => p.kind !== 'textEditGroup' && p.kind !== 'undoStop');
+		const previousItemIndex = result.findLastIndex(p => p.kind !== 'textEditGroup' && p.kind !== 'undoStop');
 		const previousItem = result[previousItemIndex];
 		if (item.kind === 'inlineReference') {
 			let label: string | undefined = item.name;
diff --git a/src/vs/workbench/contrib/debug/common/debugModel.ts b/src/vs/workbench/contrib/debug/common/debugModel.ts
index 8a468452695..9c943348a97 100644
--- a/src/vs/workbench/contrib/debug/common/debugModel.ts
+++ b/src/vs/workbench/contrib/debug/common/debugModel.ts
@@ -4,7 +4,6 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { distinct } from '../../../../base/common/arrays.js';
-import { findLastIdx } from '../../../../base/common/arraysFind.js';
 import { DeferredPromise, RunOnceScheduler } from '../../../../base/common/async.js';
 import { VSBuffer, decodeBase64, encodeBase64 } from '../../../../base/common/buffer.js';
 import { CancellationTokenSource } from '../../../../base/common/cancellation.js';
@@ -1542,7 +1541,7 @@ export class DebugModel extends Disposable implements IDebugModel {
 		let index = -1;
 		if (session.parentSession) {
 			// Make sure that child sessions are placed after the parent session
-			index = findLastIdx(this.sessions, s => s.parentSession === session.parentSession || s === session.parentSession);
+			index = this.sessions.findLastIndex(s => s.parentSession === session.parentSession || s === session.parentSession);
 		}
 		if (index >= 0) {
 			this.sessions.splice(index + 1, 0, session);
diff --git a/src/vs/workbench/contrib/notebook/browser/diff/notebookDiffEditor.ts b/src/vs/workbench/contrib/notebook/browser/diff/notebookDiffEditor.ts
index 3b26d58d13a..8b06a57a016 100644
--- a/src/vs/workbench/contrib/notebook/browser/diff/notebookDiffEditor.ts
+++ b/src/vs/workbench/contrib/notebook/browser/diff/notebookDiffEditor.ts
@@ -5,7 +5,6 @@
 
 import * as nls from '../../../../../nls.js';
 import * as DOM from '../../../../../base/browser/dom.js';
-import { findLastIdx } from '../../../../../base/common/arraysFind.js';
 import { IStorageService } from '../../../../../platform/storage/common/storage.js';
 import { ITelemetryService } from '../../../../../platform/telemetry/common/telemetry.js';
 import { IThemeService, registerThemingParticipant } from '../../../../../platform/theme/common/themeService.js';
@@ -774,7 +773,7 @@ export class NotebookTextDiffEditor extends EditorPane implements INotebookTextD
 			this._list.reveal(prevChangeIndex);
 		} else {
 			// go to the last one
-			const index = findLastIdx(currentViewModels, vm => vm.type !== 'unchanged' && vm.type !== 'unchangedMetadata' && vm.type !== 'placeholder');
+			const index = currentViewModels.findLastIndex(vm => vm.type !== 'unchanged' && vm.type !== 'unchangedMetadata' && vm.type !== 'placeholder');
 			if (index >= 0) {
 				this._list.setFocus([index]);
 				this._list.reveal(index);