diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 12f3fe83572..b69fb900dd1 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -1516,7 +1516,9 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			EditSessionIdentityMatch: EditSessionIdentityMatch,
 			InteractiveSessionVoteDirection: extHostTypes.InteractiveSessionVoteDirection,
 			InteractiveSessionCopyKind: extHostTypes.InteractiveSessionCopyKind,
-			InteractiveEditorResponseFeedbackKind: extHostTypes.InteractiveEditorResponseFeedbackKind
+			InteractiveEditorResponseFeedbackKind: extHostTypes.InteractiveEditorResponseFeedbackKind,
+			StackFrameFocus: extHostTypes.StackFrameFocus,
+			ThreadFocus: extHostTypes.ThreadFocus
 		};
 	};
 }
diff --git a/src/vs/workbench/api/common/extHostDebugService.ts b/src/vs/workbench/api/common/extHostDebugService.ts
index 415df6d572a..6ba0e4f9b30 100644
--- a/src/vs/workbench/api/common/extHostDebugService.ts
+++ b/src/vs/workbench/api/common/extHostDebugService.ts
@@ -16,7 +16,7 @@ import { DebugSessionUUID, ExtHostDebugServiceShape, IBreakpointsDeltaDto, IThre
 import { IExtHostEditorTabs } from 'vs/workbench/api/common/extHostEditorTabs';
 import { IExtHostExtensionService } from 'vs/workbench/api/common/extHostExtensionService';
 import { IExtHostRpcService } from 'vs/workbench/api/common/extHostRpcService';
-import { Breakpoint, DataBreakpoint, DebugAdapterExecutable, DebugAdapterInlineImplementation, DebugAdapterNamedPipeServer, DebugAdapterServer, DebugConsoleMode, Disposable, FunctionBreakpoint, Location, Position, setBreakpointId, SourceBreakpoint } from 'vs/workbench/api/common/extHostTypes';
+import { Breakpoint, DataBreakpoint, DebugAdapterExecutable, DebugAdapterInlineImplementation, DebugAdapterNamedPipeServer, DebugAdapterServer, DebugConsoleMode, Disposable, FunctionBreakpoint, Location, Position, setBreakpointId, SourceBreakpoint, ThreadFocus, StackFrameFocus } from 'vs/workbench/api/common/extHostTypes';
 import { IExtHostWorkspace } from 'vs/workbench/api/common/extHostWorkspace';
 import { AbstractDebugAdapter } from 'vs/workbench/contrib/debug/common/abstractDebugAdapter';
 import { IAdapterDescriptor, IConfig, IDebugAdapter, IDebugAdapterExecutable, IDebugAdapterNamedPipeServer, IDebugAdapterServer, IDebuggerContribution } from 'vs/workbench/contrib/debug/common/debug';
@@ -601,29 +601,20 @@ export abstract class ExtHostDebugServiceBase implements IExtHostDebugService, E
 	}
 
 	public async $acceptStackFrameFocus(focusDto: IThreadFocusDto | IStackFrameFocusDto): Promise<void> {
-		let focus: vscode.ThreadFocus | vscode.StackFrameFocus;
+		let focus: ThreadFocus | StackFrameFocus;
 		const session = focusDto.sessionId ? await this.getSession(focusDto.sessionId) : undefined;
 		if (!session) {
 			throw new Error('no DebugSession found for debug focus context');
 		}
 
 		if (focusDto.kind === 'thread') {
-			focus = {
-				kind: focusDto.kind,
-				threadId: focusDto.threadId,
-				session,
-			};
+			focus = new ThreadFocus(session, focusDto.threadId);
 		} else {
-			focus = {
-				kind: focusDto.kind,
-				threadId: focusDto.threadId,
-				frameId: focusDto.frameId,
-				session,
-			};
+			focus = new StackFrameFocus(session, focusDto.threadId, focusDto.frameId);
 		}
 
-		this._stackFrameFocus = focus;
-		this._onDidChangeStackFrameFocus.fire(focus);
+		this._stackFrameFocus = <vscode.ThreadFocus | vscode.StackFrameFocus>focus;
+		this._onDidChangeStackFrameFocus.fire(this._stackFrameFocus);
 	}
 
 	public $provideDebugConfigurations(configProviderHandle: number, folderUri: UriComponents | undefined, token: CancellationToken): Promise<vscode.DebugConfiguration[]> {
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 0eb50c6f095..c53fd072ae6 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -2957,6 +2957,24 @@ export class DebugAdapterInlineImplementation implements vscode.DebugAdapterInli
 	}
 }
 
+
+@es5ClassCompat
+export class StackFrameFocus {
+	constructor(
+		public readonly session: vscode.DebugSession,
+		readonly threadId?: number,
+		readonly frameId?: number) { }
+}
+
+@es5ClassCompat
+export class ThreadFocus {
+	constructor(
+		public readonly session: vscode.DebugSession,
+		readonly threadId?: number) { }
+}
+
+
+
 @es5ClassCompat
 export class EvaluatableExpression implements vscode.EvaluatableExpression {
 	readonly range: vscode.Range;
diff --git a/src/vscode-dts/vscode.proposed.debugFocus.d.ts b/src/vscode-dts/vscode.proposed.debugFocus.d.ts
index b4b267d5402..73abb814bbe 100644
--- a/src/vscode-dts/vscode.proposed.debugFocus.d.ts
+++ b/src/vscode-dts/vscode.proposed.debugFocus.d.ts
@@ -7,9 +7,17 @@ declare module 'vscode' {
 
 	// See https://github.com/microsoft/vscode/issues/63943
 
-	export interface ThreadFocus {
-		// eslint-disable-next-line local/vscode-dts-string-type-literals
-		kind: 'thread';
+	export class ThreadFocus {
+		/**
+		 * Create a ThreadFocus
+		 * @param session
+		 * @param threadId
+		 * @param frameId
+		 */
+		constructor(
+			session: DebugSession,
+			threadId?: number);
+
 
 		/**
 		 * Debug session for thread.
@@ -22,9 +30,18 @@ declare module 'vscode' {
 		readonly threadId: number | undefined;
 	}
 
-	export interface StackFrameFocus {
-		// eslint-disable-next-line local/vscode-dts-string-type-literals
-		kind: 'stackFrame';
+	export class StackFrameFocus {
+		/**
+		 * Create a StackFrameFocus
+		 * @param session
+		 * @param threadId
+		 * @param frameId
+		 */
+		constructor(
+			session: DebugSession,
+			threadId?: number,
+			frameId?: number);
+
 
 		/**
 		 * Debug session for thread.