diff --git a/src/vs/platform/extensions/common/extensions.ts b/src/vs/platform/extensions/common/extensions.ts
index d595e2ab237..61e853c14e1 100644
--- a/src/vs/platform/extensions/common/extensions.ts
+++ b/src/vs/platform/extensions/common/extensions.ts
@@ -349,15 +349,6 @@ export interface IExtensionDescription extends IExtensionManifest {
 	enableProposedApi?: boolean;
 }
 
-export function isProposedApiEnabled(extension: IExtensionDescription | IExtensionManifest): boolean {
-	return Boolean(extension.enableProposedApi);
-}
-
-export function checkProposedApiEnabled(extension: IExtensionDescription): void {
-	if (!isProposedApiEnabled(extension)) {
-		throw new Error(`[${extension.identifier.value}]: Proposed API is only available when running out of dev or with the following command line switch: --enable-proposed-api ${extension.identifier.value}`);
-	}
-}
 
 export function isLanguagePackExtension(manifest: IExtensionManifest): boolean {
 	return manifest.contributes && manifest.contributes.localizations ? manifest.contributes.localizations.length > 0 : false;
@@ -368,7 +359,7 @@ export function isAuthenticationProviderExtension(manifest: IExtensionManifest):
 }
 
 export function isResolverExtension(manifest: IExtensionManifest, remoteAuthority: string | undefined): boolean {
-	if (remoteAuthority && isProposedApiEnabled(manifest)) {
+	if (remoteAuthority) {
 		const activationEvent = `onResolveRemoteAuthority:${getRemoteName(remoteAuthority)}`;
 		return manifest.activationEvents?.indexOf(activationEvent) !== -1;
 	}
diff --git a/src/vs/workbench/api/browser/viewsExtensionPoint.ts b/src/vs/workbench/api/browser/viewsExtensionPoint.ts
index 63fcf147042..c90faec496b 100644
--- a/src/vs/workbench/api/browser/viewsExtensionPoint.ts
+++ b/src/vs/workbench/api/browser/viewsExtensionPoint.ts
@@ -10,7 +10,7 @@ import * as resources from 'vs/base/common/resources';
 import { URI } from 'vs/base/common/uri';
 import { localize } from 'vs/nls';
 import { ContextKeyExpr } from 'vs/platform/contextkey/common/contextkey';
-import { ExtensionIdentifier, IExtensionDescription, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { SyncDescriptor } from 'vs/platform/instantiation/common/descriptors';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { Registry } from 'vs/platform/registry/common/platform';
@@ -25,6 +25,7 @@ import { VIEWLET_ID as EXPLORER } from 'vs/workbench/contrib/files/common/files'
 import { VIEWLET_ID as REMOTE } from 'vs/workbench/contrib/remote/browser/remoteExplorer';
 import { VIEWLET_ID as SCM } from 'vs/workbench/contrib/scm/common/scm';
 import { WebviewViewPane } from 'vs/workbench/contrib/webviewView/browser/webviewViewPane';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 import { ExtensionMessageCollector, ExtensionsRegistry, IExtensionPoint, IExtensionPointUser } from 'vs/workbench/services/extensions/common/extensionsRegistry';
 import { LifecyclePhase } from 'vs/workbench/services/lifecycle/common/lifecycle';
 
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 84e2a4eb04a..f8305f0b65d 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -49,7 +49,7 @@ import { IExtHostWorkspace } from 'vs/workbench/api/common/extHostWorkspace';
 import { ProxyIdentifier } from 'vs/workbench/services/extensions/common/proxyIdentifier';
 import { ExtensionDescriptionRegistry } from 'vs/workbench/services/extensions/common/extensionDescriptionRegistry';
 import type * as vscode from 'vscode';
-import { checkProposedApiEnabled, IExtensionDescription, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { values } from 'vs/base/common/collections';
 import { ExtHostEditorInsets } from 'vs/workbench/api/common/extHostCodeInsets';
 import { ExtHostLabelService } from 'vs/workbench/api/common/extHostLabelService';
@@ -90,6 +90,7 @@ import { matchesScheme } from 'vs/platform/opener/common/opener';
 import { ExtHostNotebookEditors } from 'vs/workbench/api/common/extHostNotebookEditors';
 import { ExtHostNotebookDocuments } from 'vs/workbench/api/common/extHostNotebookDocuments';
 import { ExtHostInteractive } from 'vs/workbench/api/common/extHostInteractive';
+import { checkProposedApiEnabled, isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 export interface IExtensionApiFactory {
 	(extension: IExtensionDescription, registry: ExtensionDescriptionRegistry, configProvider: ExtHostConfigProvider): typeof vscode;
diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
index abd8d5c0b34..81bfcbc8280 100644
--- a/src/vs/workbench/api/common/extHostExtensionService.ts
+++ b/src/vs/workbench/api/common/extHostExtensionService.ts
@@ -17,11 +17,11 @@ import { ExtHostConfiguration, IExtHostConfiguration } from 'vs/workbench/api/co
 import { ActivatedExtension, EmptyExtension, ExtensionActivationReason, ExtensionActivationTimes, ExtensionActivationTimesBuilder, ExtensionsActivator, IExtensionAPI, IExtensionModule, HostExtension, ExtensionActivationTimesFragment } from 'vs/workbench/api/common/extHostExtensionActivator';
 import { ExtHostStorage, IExtHostStorage } from 'vs/workbench/api/common/extHostStorage';
 import { ExtHostWorkspace, IExtHostWorkspace } from 'vs/workbench/api/common/extHostWorkspace';
-import { MissingExtensionDependency, ActivationKind } from 'vs/workbench/services/extensions/common/extensions';
+import { MissingExtensionDependency, ActivationKind, checkProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 import { ExtensionDescriptionRegistry } from 'vs/workbench/services/extensions/common/extensionDescriptionRegistry';
 import * as errors from 'vs/base/common/errors';
 import type * as vscode from 'vscode';
-import { checkProposedApiEnabled, ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { VSBuffer } from 'vs/base/common/buffer';
 import { ExtensionGlobalMemento, ExtensionMemento } from 'vs/workbench/api/common/extHostMemento';
 import { RemoteAuthorityResolverError, ExtensionKind, ExtensionMode, ExtensionRuntime } from 'vs/workbench/api/common/extHostTypes';
diff --git a/src/vs/workbench/api/common/extHostMessageService.ts b/src/vs/workbench/api/common/extHostMessageService.ts
index d33e16ce3d7..9f36d8dd3ac 100644
--- a/src/vs/workbench/api/common/extHostMessageService.ts
+++ b/src/vs/workbench/api/common/extHostMessageService.ts
@@ -6,8 +6,9 @@
 import Severity from 'vs/base/common/severity';
 import type * as vscode from 'vscode';
 import { MainContext, MainThreadMessageServiceShape, MainThreadMessageOptions, IMainContext } from './extHost.protocol';
-import { checkProposedApiEnabled, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { ILogService } from 'vs/platform/log/common/log';
+import { checkProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 function isMessageItem(item: any): item is vscode.MessageItem {
 	return item && item.title;
diff --git a/src/vs/workbench/api/common/extHostNotebookKernels.ts b/src/vs/workbench/api/common/extHostNotebookKernels.ts
index b307608415c..91b9099a90b 100644
--- a/src/vs/workbench/api/common/extHostNotebookKernels.ts
+++ b/src/vs/workbench/api/common/extHostNotebookKernels.ts
@@ -10,7 +10,7 @@ import { Emitter } from 'vs/base/common/event';
 import { Disposable, DisposableStore } from 'vs/base/common/lifecycle';
 import { ResourceMap } from 'vs/base/common/map';
 import { URI, UriComponents } from 'vs/base/common/uri';
-import { checkProposedApiEnabled, ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { ILogService } from 'vs/platform/log/common/log';
 import { ExtHostNotebookKernelsShape, ICellExecuteUpdateDto, IMainContext, INotebookKernelDto2, MainContext, MainThreadNotebookKernelsShape, NotebookOutputDto } from 'vs/workbench/api/common/extHost.protocol';
 import { ApiCommand, ApiCommandArgument, ApiCommandResult, ExtHostCommands } from 'vs/workbench/api/common/extHostCommands';
@@ -21,6 +21,7 @@ import * as extHostTypeConverters from 'vs/workbench/api/common/extHostTypeConve
 import { NotebookCellOutput } from 'vs/workbench/api/common/extHostTypes';
 import { asWebviewUri } from 'vs/workbench/api/common/shared/webview';
 import { CellExecutionUpdateType } from 'vs/workbench/contrib/notebook/common/notebookExecutionService';
+import { checkProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 import { SerializableObjectWithBuffers } from 'vs/workbench/services/extensions/common/proxyIdentifier';
 import * as vscode from 'vscode';
 
diff --git a/src/vs/workbench/api/common/extHostNotebookRenderers.ts b/src/vs/workbench/api/common/extHostNotebookRenderers.ts
index 6e50023991c..c217759d9bd 100644
--- a/src/vs/workbench/api/common/extHostNotebookRenderers.ts
+++ b/src/vs/workbench/api/common/extHostNotebookRenderers.ts
@@ -4,10 +4,11 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { Emitter } from 'vs/base/common/event';
-import { IExtensionManifest, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { ExtHostNotebookRenderersShape, IMainContext, MainContext, MainThreadNotebookRenderersShape } from 'vs/workbench/api/common/extHost.protocol';
 import { ExtHostNotebookController } from 'vs/workbench/api/common/extHostNotebook';
 import { ExtHostNotebookEditor } from 'vs/workbench/api/common/extHostNotebookEditor';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 import * as vscode from 'vscode';
 
 
@@ -24,7 +25,7 @@ export class ExtHostNotebookRenderers implements ExtHostNotebookRenderersShape {
 		this._rendererMessageEmitters.get(rendererId)?.fire({ editor: editor.apiEditor, message });
 	}
 
-	public createRendererMessaging(manifest: IExtensionManifest, rendererId: string): vscode.NotebookRendererMessaging {
+	public createRendererMessaging(manifest: IExtensionDescription, rendererId: string): vscode.NotebookRendererMessaging {
 		if (!manifest.contributes?.notebookRenderer?.some(r => r.id === rendererId)) {
 			throw new Error(`Extensions may only call createRendererMessaging() for renderers they contribute (got ${rendererId})`);
 		}
diff --git a/src/vs/workbench/api/common/extHostSCM.ts b/src/vs/workbench/api/common/extHostSCM.ts
index 26988a5fe22..1db3c75923c 100644
--- a/src/vs/workbench/api/common/extHostSCM.ts
+++ b/src/vs/workbench/api/common/extHostSCM.ts
@@ -16,11 +16,12 @@ import type * as vscode from 'vscode';
 import { ISplice } from 'vs/base/common/sequence';
 import { ILogService } from 'vs/platform/log/common/log';
 import { CancellationToken } from 'vs/base/common/cancellation';
-import { checkProposedApiEnabled, ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { MarshalledId } from 'vs/base/common/marshalling';
 import { ThemeIcon } from 'vs/platform/theme/common/themeService';
 import { IMarkdownString } from 'vs/base/common/htmlContent';
 import { MarkdownString } from 'vs/workbench/api/common/extHostTypeConverters';
+import { checkProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 type ProviderHandle = number;
 type GroupHandle = number;
diff --git a/src/vs/workbench/api/common/menusExtensionPoint.ts b/src/vs/workbench/api/common/menusExtensionPoint.ts
index 29e02c1c08b..82999144a2e 100644
--- a/src/vs/workbench/api/common/menusExtensionPoint.ts
+++ b/src/vs/workbench/api/common/menusExtensionPoint.ts
@@ -16,7 +16,7 @@ import { DisposableStore } from 'vs/base/common/lifecycle';
 import { ThemeIcon } from 'vs/platform/theme/common/themeService';
 import { Iterable } from 'vs/base/common/iterator';
 import { index } from 'vs/base/common/arrays';
-import { isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 interface IAPIMenu {
 	readonly key: string;
diff --git a/src/vs/workbench/contrib/remote/browser/remote.ts b/src/vs/workbench/contrib/remote/browser/remote.ts
index 5acad42f25c..4d48e2e58ca 100644
--- a/src/vs/workbench/contrib/remote/browser/remote.ts
+++ b/src/vs/workbench/contrib/remote/browser/remote.ts
@@ -15,13 +15,13 @@ import { IConfigurationService } from 'vs/platform/configuration/common/configur
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { IThemeService, ThemeIcon } from 'vs/platform/theme/common/themeService';
 import { IContextMenuService } from 'vs/platform/contextview/browser/contextView';
-import { IExtensionService } from 'vs/workbench/services/extensions/common/extensions';
+import { IExtensionService, isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 import { FilterViewPaneContainer } from 'vs/workbench/browser/parts/views/viewsViewlet';
 import { AutomaticPortForwarding, ForwardedPortsView, PortRestore, VIEWLET_ID } from 'vs/workbench/contrib/remote/browser/remoteExplorer';
 import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
 import { IViewDescriptor, IViewsRegistry, Extensions, ViewContainerLocation, IViewContainersRegistry, IViewDescriptorService } from 'vs/workbench/common/views';
 import { Registry } from 'vs/platform/registry/common/platform';
-import { IExtensionDescription, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { IOpenerService } from 'vs/platform/opener/common/opener';
 import { IQuickInputService } from 'vs/platform/quickinput/common/quickInput';
 import { ICommandService } from 'vs/platform/commands/common/commands';
diff --git a/src/vs/workbench/contrib/welcome/common/viewsWelcomeContribution.ts b/src/vs/workbench/contrib/welcome/common/viewsWelcomeContribution.ts
index a9ef766660e..da5323be01f 100644
--- a/src/vs/workbench/contrib/welcome/common/viewsWelcomeContribution.ts
+++ b/src/vs/workbench/contrib/welcome/common/viewsWelcomeContribution.ts
@@ -11,7 +11,7 @@ import { IExtensionPoint, IExtensionPointUser } from 'vs/workbench/services/exte
 import { ViewsWelcomeExtensionPoint, ViewWelcome, ViewIdentifierMap } from './viewsWelcomeExtensionPoint';
 import { Registry } from 'vs/platform/registry/common/platform';
 import { Extensions as ViewContainerExtensions, IViewContentDescriptor, IViewsRegistry } from 'vs/workbench/common/views';
-import { isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 const viewsRegistry = Registry.as<IViewsRegistry>(ViewContainerExtensions.ViewsRegistry);
 
diff --git a/src/vs/workbench/services/extensions/common/extensions.ts b/src/vs/workbench/services/extensions/common/extensions.ts
index ce65f021533..69a96de2d91 100644
--- a/src/vs/workbench/services/extensions/common/extensions.ts
+++ b/src/vs/workbench/services/extensions/common/extensions.ts
@@ -133,6 +133,16 @@ export interface IExtensionHost {
 	dispose(): void;
 }
 
+export function isProposedApiEnabled(extension: IExtensionDescription): boolean {
+	return Boolean(extension.enableProposedApi);
+}
+
+export function checkProposedApiEnabled(extension: IExtensionDescription): void {
+	if (!isProposedApiEnabled(extension)) {
+		throw new Error(`[${extension.identifier.value}]: Proposed API is only available when running out of dev or with the following command line switch: --enable-proposed-api ${extension.identifier.value}`);
+	}
+}
+
 
 /**
  * Extension id or one of the four known program states.
diff --git a/src/vs/workbench/services/extensions/node/proxyResolver.ts b/src/vs/workbench/services/extensions/node/proxyResolver.ts
index 43a42e6001c..9c29c7d2b55 100644
--- a/src/vs/workbench/services/extensions/node/proxyResolver.ts
+++ b/src/vs/workbench/services/extensions/node/proxyResolver.ts
@@ -13,8 +13,9 @@ import { MainThreadTelemetryShape, IInitData } from 'vs/workbench/api/common/ext
 import { ExtHostExtensionService } from 'vs/workbench/api/node/extHostExtensionService';
 import { URI } from 'vs/base/common/uri';
 import { ILogService } from 'vs/platform/log/common/log';
-import { IExtensionDescription, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { LogLevel, createHttpPatch, ProxyResolveEvent, createProxyResolver, createTlsPatch, ProxySupportSetting } from 'vscode-proxy-agent';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 export function connectProxyResolver(
 	extHostWorkspace: IExtHostWorkspaceProvider,
diff --git a/src/vs/workbench/services/label/common/labelService.ts b/src/vs/workbench/services/label/common/labelService.ts
index 54112c8b342..15252f0546e 100644
--- a/src/vs/workbench/services/label/common/labelService.ts
+++ b/src/vs/workbench/services/label/common/labelService.ts
@@ -21,7 +21,7 @@ import { match } from 'vs/base/common/glob';
 import { LifecyclePhase } from 'vs/workbench/services/lifecycle/common/lifecycle';
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { IPathService } from 'vs/workbench/services/path/common/pathService';
-import { isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 const resourceLabelFormattersExtPoint = ExtensionsRegistry.registerExtensionPoint<ResourceLabelFormatter[]>({
 	extensionPoint: 'resourceLabelFormatters',
diff --git a/src/vs/workbench/services/themes/common/iconExtensionPoint.ts b/src/vs/workbench/services/themes/common/iconExtensionPoint.ts
index 152345e43f9..cfee6d8370b 100644
--- a/src/vs/workbench/services/themes/common/iconExtensionPoint.ts
+++ b/src/vs/workbench/services/themes/common/iconExtensionPoint.ts
@@ -10,7 +10,8 @@ import { Registry } from 'vs/platform/registry/common/platform';
 import { CSSIcon } from 'vs/base/common/codicons';
 import { fontIdRegex } from 'vs/workbench/services/themes/common/productIconThemeSchema';
 import * as resources from 'vs/base/common/resources';
-import { IExtensionDescription, isProposedApiEnabled } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { isProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 interface IIconExtensionPoint {
 	id: string;