diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index b8db1d68f61..76a355c018c 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -7906,6 +7906,12 @@ declare module 'vscode' {
 		 */
 		export const sessionId: string;
 
+		/**
+		 * Indicates that this is a fresh install of the application.
+		 * `true` if within the first day of installation otherwise `false`.
+		 */
+		export const isNewAppInstall: boolean;
+
 		/**
 		 * The name of a remote. Defined by extensions, popular samples are `wsl` for the Windows
 		 * Subsystem for Linux or `ssh-remote` for remotes using a secure shell.
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 061f398d9f2..14785c206be 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -2103,11 +2103,6 @@ declare module 'vscode' {
 
 	export interface ExtensionContext {
 		readonly extensionRuntime: ExtensionRuntime;
-
-		/**
-		 * Indicates that this is a fresh install of VS Code.
-		 */
-		readonly isNewInstall: boolean;
 	}
 
 	//#endregion
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 3f1a6431f99..6f953976ef5 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -303,6 +303,10 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 				checkProposedApiEnabled(extension);
 				return extHostTelemetry.onDidChangeTelemetryEnabled;
 			},
+			get isNewAppInstall() {
+				const installAge = Date.now() - new Date(initData.telemetryInfo.firstSessionDate).getTime();
+				return isNaN(installAge) ? false : installAge < 1000 * 60 * 60 * 24; // install age is less than a day
+			},
 			openExternal(uri: URI, options?: { allowContributedOpeners?: boolean | string; }) {
 				return extHostWindow.openUri(uri, {
 					allowTunneling: !!initData.remote.authority,
diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
index 56fb1c262be..47641e7993c 100644
--- a/src/vs/workbench/api/common/extHostExtensionService.ts
+++ b/src/vs/workbench/api/common/extHostExtensionService.ts
@@ -388,7 +388,6 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 		const extensionMode = extensionDescription.isUnderDevelopment
 			? (this._initData.environment.extensionTestsLocationURI ? ExtensionMode.Test : ExtensionMode.Development)
 			: ExtensionMode.Production;
-		const installAge = Date.now() - new Date(this._initData.telemetryInfo.firstSessionDate).getTime();
 
 		this._logService.trace(`ExtensionService#loadExtensionContext ${extensionDescription.identifier.value}`);
 
@@ -425,10 +424,6 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 					checkProposedApiEnabled(extensionDescription);
 					return that.extensionRuntime;
 				},
-				get isNewInstall() {
-					checkProposedApiEnabled(extensionDescription);
-					return isNaN(installAge) ? false : installAge < 1000 * 60 * 60 * 24; // installAge is less than a day;
-				},
 				get environmentVariableCollection() { return that._extHostTerminalService.getEnvironmentVariableCollection(extensionDescription); }
 			});
 		});