Properly gate type acquisition on web (microsoft#223403)

For microsoft#221299

Make sure we don't register the file system at all in these cases

extensions/typescript-language-features/src/extension.browser.ts

@@ -11,8 +11,7 @@ import { registerBaseCommands } from './commands/index';
 import { TypeScriptServiceConfiguration } from './configuration/configuration';
 import { BrowserServiceConfigurationProvider } from './configuration/configuration.browser';
 import { ExperimentationTelemetryReporter, IExperimentationTelemetryReporter } from './experimentTelemetryReporter';
-import { AutoInstallerFs } from './filesystems/autoInstallerFs';
-import { MemFs } from './filesystems/memFs';
+import { registerAtaSupport } from './filesystems/ata';
 import { createLazyClientHost, lazilyActivateClient } from './lazyClientHost';
 import { Logger } from './logging/logger';
 import RemoteRepositories from './remoteRepositories.browser';
@@ -25,7 +24,7 @@ import { ITypeScriptVersionProvider, TypeScriptVersion, TypeScriptVersionSource
 import { ActiveJsTsEditorTracker } from './ui/activeJsTsEditorTracker';
 import { Disposable } from './utils/dispose';
 import { getPackageInfo } from './utils/packageInfo';
-import { isWebAndHasSharedArrayBuffers, supportsReadableByteStreams } from './utils/platform';
+import { isWebAndHasSharedArrayBuffers } from './utils/platform';
 
 class StaticVersionProvider implements ITypeScriptVersionProvider {
 
@@ -102,16 +101,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<Api> {
 		await startPreloadWorkspaceContentsIfNeeded(context, logger);
 	}));
 
-	if (supportsReadableByteStreams()) {
-		context.subscriptions.push(vscode.workspace.registerFileSystemProvider('vscode-global-typings', new MemFs(), {
-			isCaseSensitive: true,
-			isReadonly: false
-		}));
-		context.subscriptions.push(vscode.workspace.registerFileSystemProvider('vscode-node-modules', new AutoInstallerFs(), {
-			isCaseSensitive: true,
-			isReadonly: false
-		}));
-	}
+	context.subscriptions.push(registerAtaSupport());
 
 	return getExtensionApi(onCompletionAccepted.event, pluginManager);
 }

extensions/typescript-language-features/src/filesystems/ata.ts

@@ -0,0 +1,30 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import { conditionalRegistration, requireGlobalConfiguration } from '../languageFeatures/util/dependentRegistration';
+import { supportsReadableByteStreams } from '../utils/platform';
+import { AutoInstallerFs } from './autoInstallerFs';
+import { MemFs } from './memFs';
+
+export function registerAtaSupport(): vscode.Disposable {
+	if (!supportsReadableByteStreams()) {
+		return vscode.Disposable.from();
+	}
+
+	return conditionalRegistration([
+		requireGlobalConfiguration('typescript', 'tsserver.web.typeAcquisition.enabled'),
+	], () => {
+		return vscode.Disposable.from(
+			vscode.workspace.registerFileSystemProvider('vscode-global-typings', new MemFs(), {
+				isCaseSensitive: true,
+				isReadonly: false
+			}),
+			vscode.workspace.registerFileSystemProvider('vscode-node-modules', new AutoInstallerFs(), {
+				isCaseSensitive: true,
+				isReadonly: false
+			}));
+	});
+}

extensions/typescript-language-features/src/tsServer/serverProcess.browser.ts

@@ -40,7 +40,7 @@ export class WorkerServerProcessFactory implements TsServerProcessFactory {
 		version: TypeScriptVersion,
 		args: readonly string[],
 		kind: TsServerProcessKind,
-		_configuration: TypeScriptServiceConfiguration,
+		configuration: TypeScriptServiceConfiguration,
 		_versionManager: TypeScriptVersionManager,
 		_nodeVersionManager: NodeVersionManager,
 		tsServerLog: TsServerLog | undefined,
@@ -50,10 +50,10 @@ export class WorkerServerProcessFactory implements TsServerProcessFactory {
 			...args,
 			// Explicitly give TS Server its path so it can load local resources
 			'--executingFilePath', tsServerPath,
+			// Enable/disable web type acquisition
+			(configuration.webTypeAcquisitionEnabled && supportsReadableByteStreams() ? '--experimentalTypeAcquisition' : '--disableAutomaticTypingAcquisition'),
 		];
-		if (_configuration.webTypeAcquisitionEnabled && supportsReadableByteStreams()) {
-			launchArgs.push('--experimentalTypeAcquisition');
-		}
+
 		return new WorkerServerProcess(kind, tsServerPath, this._extensionUri, launchArgs, tsServerLog, this._logger);
 	}
 }