Work towards allowing enhanced syntax server commands to be run against any file

We currently restrict the TS server to working with a small set of file schemes. This is done because the TS server itself cannot read files from on of VS Code's virtual file system providers (and will crash if it tries to do so)

However we can enable single file commands for these other file schemes, so long as they are treated as in-memory files. This change works towards supporting that by changing when certain providers are enabled/disabled

extensions/typescript-language-features/src/features/callHierarchy.ts

@@ -7,9 +7,10 @@ import * as path from 'path';
 import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
 import * as PConst from '../protocol.const';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
-import { conditionalRegistration, requireMinVersion } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import { parseKindModifier } from '../utils/modifiers';
 import * as typeConverters from '../utils/typeConverters';
 
@@ -117,13 +118,14 @@ function fromProtocolCallHierchyOutgoingCall(item: Proto.CallHierarchyOutgoingCa
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient
 ) {
 	return conditionalRegistration([
 		requireMinVersion(client, TypeScriptCallHierarchySupport.minVersion),
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCallHierarchyProvider(selector,
+		return vscode.languages.registerCallHierarchyProvider(selector.syntax,
 			new TypeScriptCallHierarchySupport(client));
 	});
 }

extensions/typescript-language-features/src/features/completions.ts

@@ -7,12 +7,13 @@ import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import type * as Proto from '../protocol';
 import * as PConst from '../protocol.const';
-import { ITypeScriptServiceClient, ServerResponse } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient, ServerResponse } from '../typescriptService';
 import API from '../utils/api';
 import { nulToken } from '../utils/cancellation';
 import { applyCodeAction } from '../utils/codeAction';
 import { Command, CommandManager } from '../utils/commandManager';
-import { conditionalRegistration, requireConfiguration } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireConfiguration } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import { parseKindModifier } from '../utils/modifiers';
 import * as Previewer from '../utils/previewer';
 import { snippetForFunctionCall } from '../utils/snippetForFunctionCall';
@@ -795,7 +796,7 @@ function shouldExcludeCompletionEntry(
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 	typingsStatus: TypingsStatus,
@@ -806,8 +807,9 @@ export function register(
 ) {
 	return conditionalRegistration([
 		requireConfiguration(modeId, 'suggest.enabled'),
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCompletionItemProvider(selector,
+		return vscode.languages.registerCompletionItemProvider(selector.syntax,
 			new TypeScriptCompletionItemProvider(client, modeId, typingsStatus, fileConfigurationManager, commandManager, telemetryReporter, onCompletionAccepted),
 			...TypeScriptCompletionItemProvider.triggerCharacters);
 	});

extensions/typescript-language-features/src/features/definitions.ts

@@ -4,8 +4,10 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 import DefinitionProviderBase from './definitionProviderBase';
 
@@ -58,9 +60,13 @@ export default class TypeScriptDefinitionProvider extends DefinitionProviderBase
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerDefinitionProvider(selector,
-		new TypeScriptDefinitionProvider(client));
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerDefinitionProvider(selector.syntax,
+			new TypeScriptDefinitionProvider(client));
+	});
 }

extensions/typescript-language-features/src/features/directiveCommentCompletions.ts

@@ -7,6 +7,7 @@ import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import { ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
+import { DocumentSelector } from '../utils/documentSelector';
 
 const localize = nls.loadMessageBundle();
 
@@ -80,10 +81,10 @@ class DirectiveCommentCompletionProvider implements vscode.CompletionItemProvide
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerCompletionItemProvider(selector,
+	return vscode.languages.registerCompletionItemProvider(selector.syntax,
 		new DirectiveCommentCompletionProvider(client),
 		'@');
 }

extensions/typescript-language-features/src/features/documentHighlight.ts

@@ -7,6 +7,7 @@ import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
 import { ITypeScriptServiceClient } from '../typescriptService';
 import { flatten } from '../utils/arrays';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 class TypeScriptDocumentHighlightProvider implements vscode.DocumentHighlightProvider {
@@ -48,9 +49,9 @@ function convertDocumentHighlight(highlight: Proto.DocumentHighlightsItem): Read
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerDocumentHighlightProvider(selector,
+	return vscode.languages.registerDocumentHighlightProvider(selector.syntax,
 		new TypeScriptDocumentHighlightProvider(client));
 }

extensions/typescript-language-features/src/features/documentSymbol.ts

@@ -6,10 +6,11 @@
 import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
 import * as PConst from '../protocol.const';
-import { ITypeScriptServiceClient } from '../typescriptService';
-import * as typeConverters from '../utils/typeConverters';
 import { CachedResponse } from '../tsServer/cachedResponse';
+import { ITypeScriptServiceClient } from '../typescriptService';
+import { DocumentSelector } from '../utils/documentSelector';
 import { parseKindModifier } from '../utils/modifiers';
+import * as typeConverters from '../utils/typeConverters';
 
 const getSymbolKind = (kind: string): vscode.SymbolKind => {
 	switch (kind) {
@@ -111,10 +112,10 @@ class TypeScriptDocumentSymbolProvider implements vscode.DocumentSymbolProvider
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	cachedResponse: CachedResponse<Proto.NavTreeResponse>,
 ) {
-	return vscode.languages.registerDocumentSymbolProvider(selector,
+	return vscode.languages.registerDocumentSymbolProvider(selector.syntax,
 		new TypeScriptDocumentSymbolProvider(client, cachedResponse), { label: 'TypeScript' });
 }

extensions/typescript-language-features/src/features/fixAll.ts

@@ -6,9 +6,10 @@
 import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import type * as Proto from '../protocol';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
-import { conditionalRegistration, requireMinVersion } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as errorCodes from '../utils/errorCodes';
 import * as fixNames from '../utils/fixNames';
 import * as typeConverters from '../utils/typeConverters';
@@ -249,15 +250,16 @@ class TypeScriptAutoFixProvider implements vscode.CodeActionProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	fileConfigurationManager: FileConfigurationManager,
 	diagnosticsManager: DiagnosticsManager,
 ) {
 	return conditionalRegistration([
-		requireMinVersion(client, API.v300)
+		requireMinVersion(client, API.v300),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
 		const provider = new TypeScriptAutoFixProvider(client, fileConfigurationManager, diagnosticsManager);
-		return vscode.languages.registerCodeActionsProvider(selector, provider, provider.metadata);
+		return vscode.languages.registerCodeActionsProvider(selector.semantic, provider, provider.metadata);
 	});
 }

extensions/typescript-language-features/src/features/folding.ts

@@ -9,6 +9,7 @@ import { ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
 import { coalesce } from '../utils/arrays';
 import { conditionalRegistration, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 class TypeScriptFoldingProvider implements vscode.FoldingRangeProvider {
@@ -73,13 +74,13 @@ class TypeScriptFoldingProvider implements vscode.FoldingRangeProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ): vscode.Disposable {
 	return conditionalRegistration([
 		requireMinVersion(client, TypeScriptFoldingProvider.minVersion),
 	], () => {
-		return vscode.languages.registerFoldingRangeProvider(selector,
+		return vscode.languages.registerFoldingRangeProvider(selector.syntax,
 			new TypeScriptFoldingProvider(client));
 	});
 }

extensions/typescript-language-features/src/features/formatting.ts

@@ -7,6 +7,7 @@ import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
 import { ITypeScriptServiceClient } from '../typescriptService';
 import { conditionalRegistration, requireConfiguration } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 import FileConfigurationManager from './fileConfigurationManager';
 
@@ -84,7 +85,7 @@ class TypeScriptFormattingProvider implements vscode.DocumentRangeFormattingEdit
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 	fileConfigurationManager: FileConfigurationManager
@@ -94,8 +95,8 @@ export function register(
 	], () => {
 		const formattingProvider = new TypeScriptFormattingProvider(client, fileConfigurationManager);
 		return vscode.Disposable.from(
-			vscode.languages.registerOnTypeFormattingEditProvider(selector, formattingProvider, ';', '}', '\n'),
-			vscode.languages.registerDocumentRangeFormattingEditProvider(selector, formattingProvider),
+			vscode.languages.registerOnTypeFormattingEditProvider(selector.syntax, formattingProvider, ';', '}', '\n'),
+			vscode.languages.registerDocumentRangeFormattingEditProvider(selector.syntax, formattingProvider),
 		);
 	});
 }

extensions/typescript-language-features/src/features/hover.ts

@@ -5,7 +5,9 @@
 
 import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import { markdownDocumentation } from '../utils/previewer';
 import * as typeConverters from '../utils/typeConverters';
 
@@ -51,9 +53,13 @@ class TypeScriptHoverProvider implements vscode.HoverProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient
 ): vscode.Disposable {
-	return vscode.languages.registerHoverProvider(selector,
-		new TypeScriptHoverProvider(client));
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerHoverProvider(selector.syntax,
+			new TypeScriptHoverProvider(client));
+	});
 }

extensions/typescript-language-features/src/features/implementations.ts

@@ -4,7 +4,9 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import DefinitionProviderBase from './definitionProviderBase';
 
 class TypeScriptImplementationProvider extends DefinitionProviderBase implements vscode.ImplementationProvider {
@@ -14,9 +16,13 @@ class TypeScriptImplementationProvider extends DefinitionProviderBase implements
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerImplementationProvider(selector,
-		new TypeScriptImplementationProvider(client));
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerImplementationProvider(selector.semantic,
+			new TypeScriptImplementationProvider(client));
+	});
 }

extensions/typescript-language-features/src/features/implementationsCodeLens.ts

@@ -9,7 +9,8 @@ import type * as Proto from '../protocol';
 import * as PConst from '../protocol.const';
 import { CachedResponse } from '../tsServer/cachedResponse';
 import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
-import { conditionalRegistration, requireCapability, requireConfiguration } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireConfiguration } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 import { getSymbolRange, ReferencesCodeLens, TypeScriptBaseCodeLensProvider } from './baseCodeLensProvider';
 
@@ -89,16 +90,16 @@ export default class TypeScriptImplementationsCodeLensProvider extends TypeScrip
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 	cachedResponse: CachedResponse<Proto.NavTreeResponse>,
 ) {
 	return conditionalRegistration([
 		requireConfiguration(modeId, 'implementationsCodeLens.enabled'),
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCodeLensProvider(selector,
+		return vscode.languages.registerCodeLensProvider(selector.semantic,
 			new TypeScriptImplementationsCodeLensProvider(client, cachedResponse));
 	});
 }

extensions/typescript-language-features/src/features/jsDocCompletions.ts

@@ -7,6 +7,7 @@ import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import { ITypeScriptServiceClient } from '../typescriptService';
 import { conditionalRegistration, requireConfiguration } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 
@@ -110,14 +111,14 @@ export function templateToSnippet(template: string): vscode.SnippetString {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 ): vscode.Disposable {
 	return conditionalRegistration([
 		requireConfiguration(modeId, 'suggest.completeJSDocs')
 	], () => {
-		return vscode.languages.registerCompletionItemProvider(selector,
+		return vscode.languages.registerCompletionItemProvider(selector.syntax,
 			new JsDocCompletionProvider(client),
 			'*');
 	});

extensions/typescript-language-features/src/features/organizeImports.ts

@@ -11,6 +11,7 @@ import API from '../utils/api';
 import { nulToken } from '../utils/cancellation';
 import { Command, CommandManager } from '../utils/commandManager';
 import { conditionalRegistration, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import { TelemetryReporter } from '../utils/telemetry';
 import * as typeconverts from '../utils/typeConverters';
 import FileConfigurationManager from './fileConfigurationManager';
@@ -99,7 +100,7 @@ export class OrganizeImportsCodeActionProvider implements vscode.CodeActionProvi
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	commandManager: CommandManager,
 	fileConfigurationManager: FileConfigurationManager,
@@ -109,7 +110,7 @@ export function register(
 		requireMinVersion(client, OrganizeImportsCodeActionProvider.minVersion)
 	], () => {
 		const organizeImportsProvider = new OrganizeImportsCodeActionProvider(client, commandManager, fileConfigurationManager, telemetryReporter);
-		return vscode.languages.registerCodeActionsProvider(selector,
+		return vscode.languages.registerCodeActionsProvider(selector.syntax,
 			organizeImportsProvider,
 			organizeImportsProvider.metadata);
 	});

extensions/typescript-language-features/src/features/quickFix.ts

@@ -18,7 +18,8 @@ import * as typeConverters from '../utils/typeConverters';
 import { DiagnosticsManager } from './diagnostics';
 import FileConfigurationManager from './fileConfigurationManager';
 import { equals } from '../utils/objects';
-import { conditionalRegistration, requireCapability } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 
 const localize = nls.loadMessageBundle();
 
@@ -403,7 +404,7 @@ function isPreferredFix(
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	fileConfigurationManager: FileConfigurationManager,
 	commandManager: CommandManager,
@@ -411,9 +412,9 @@ export function register(
 	telemetryReporter: TelemetryReporter
 ) {
 	return conditionalRegistration([
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCodeActionsProvider(selector,
+		return vscode.languages.registerCodeActionsProvider(selector.semantic,
 			new TypeScriptQuickFixProvider(client, fileConfigurationManager, commandManager, diagnosticsManager, telemetryReporter),
 			TypeScriptQuickFixProvider.metadata);
 	});

extensions/typescript-language-features/src/features/refactor.ts

@@ -11,7 +11,8 @@ import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService
 import API from '../utils/api';
 import { nulToken } from '../utils/cancellation';
 import { Command, CommandManager } from '../utils/commandManager';
-import { conditionalRegistration, requireCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as fileSchemes from '../utils/fileSchemes';
 import { TelemetryReporter } from '../utils/telemetry';
 import * as typeConverters from '../utils/typeConverters';
@@ -396,7 +397,7 @@ class TypeScriptRefactorProvider implements vscode.CodeActionProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	formattingOptionsManager: FormattingOptionsManager,
 	commandManager: CommandManager,
@@ -404,9 +405,9 @@ export function register(
 ) {
 	return conditionalRegistration([
 		requireMinVersion(client, TypeScriptRefactorProvider.minVersion),
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCodeActionsProvider(selector,
+		return vscode.languages.registerCodeActionsProvider(selector.semantic,
 			new TypeScriptRefactorProvider(client, formattingOptionsManager, commandManager, telemetryReporter),
 			TypeScriptRefactorProvider.metadata);
 	});

extensions/typescript-language-features/src/features/references.ts

@@ -4,7 +4,9 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 class TypeScriptReferenceSupport implements vscode.ReferenceProvider {
@@ -42,9 +44,13 @@ class TypeScriptReferenceSupport implements vscode.ReferenceProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient
 ) {
-	return vscode.languages.registerReferenceProvider(selector,
-		new TypeScriptReferenceSupport(client));
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerReferenceProvider(selector.syntax,
+			new TypeScriptReferenceSupport(client));
+	});
 }

extensions/typescript-language-features/src/features/referencesCodeLens.ts

@@ -8,8 +8,10 @@ import * as nls from 'vscode-nls';
 import type * as Proto from '../protocol';
 import * as PConst from '../protocol.const';
 import { CachedResponse } from '../tsServer/cachedResponse';
-import { ITypeScriptServiceClient, ClientCapability } from '../typescriptService';
-import { conditionalRegistration, requireConfiguration, requireCapability } from '../utils/dependentRegistration';
+import { ExectuionTarget } from '../tsServer/server';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireConfiguration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 import { getSymbolRange, ReferencesCodeLens, TypeScriptBaseCodeLensProvider } from './baseCodeLensProvider';
 
@@ -27,7 +29,11 @@ export class TypeScriptReferencesCodeLensProvider extends TypeScriptBaseCodeLens
 	public async resolveCodeLens(inputCodeLens: vscode.CodeLens, token: vscode.CancellationToken): Promise<vscode.CodeLens> {
 		const codeLens = inputCodeLens as ReferencesCodeLens;
 		const args = typeConverters.Position.toFileLocationRequestArgs(codeLens.file, codeLens.range.start);
-		const response = await this.client.execute('references', args, token, { lowPriority: true, cancelOnResourceChange: codeLens.document });
+		const response = await this.client.execute('references', args, token, {
+			lowPriority: true,
+			executionTarget: ExectuionTarget.Semantic,
+			cancelOnResourceChange: codeLens.document,
+		});
 		if (response.type !== 'response' || !response.body) {
 			codeLens.command = response.type === 'cancelled'
 				? TypeScriptBaseCodeLensProvider.cancelledCommand
@@ -122,16 +128,16 @@ export class TypeScriptReferencesCodeLensProvider extends TypeScriptBaseCodeLens
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 	cachedResponse: CachedResponse<Proto.NavTreeResponse>,
 ) {
 	return conditionalRegistration([
 		requireConfiguration(modeId, 'referencesCodeLens.enabled'),
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerCodeLensProvider(selector,
+		return vscode.languages.registerCodeLensProvider(selector.semantic,
 			new TypeScriptReferencesCodeLensProvider(client, cachedResponse, modeId));
 	});
 }

extensions/typescript-language-features/src/features/rename.ts

@@ -9,7 +9,8 @@ import * as nls from 'vscode-nls';
 import type * as Proto from '../protocol';
 import { ClientCapability, ITypeScriptServiceClient, ServerResponse } from '../typescriptService';
 import API from '../utils/api';
-import { conditionalRegistration, requireCapability } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 import FileConfigurationManager from './fileConfigurationManager';
 
@@ -138,14 +139,14 @@ class TypeScriptRenameProvider implements vscode.RenameProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 	fileConfigurationManager: FileConfigurationManager,
 ) {
 	return conditionalRegistration([
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
-		return vscode.languages.registerRenameProvider(selector,
+		return vscode.languages.registerRenameProvider(selector.semantic,
 			new TypeScriptRenameProvider(client, fileConfigurationManager));
 	});
 }

extensions/typescript-language-features/src/features/semanticTokens.ts

@@ -9,7 +9,8 @@ import * as vscode from 'vscode';
 import * as Proto from '../protocol';
 import { ClientCapability, ExecConfig, ITypeScriptServiceClient, ServerResponse } from '../typescriptService';
 import API from '../utils/api';
-import { conditionalRegistration, requireCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 
 
 const minTypeScriptVersion = API.fromVersionString(`${VersionRequirement.major}.${VersionRequirement.minor}`);
@@ -17,15 +18,18 @@ const minTypeScriptVersion = API.fromVersionString(`${VersionRequirement.major}.
 // as we don't do deltas, for performance reasons, don't compute semantic tokens for documents above that limit
 const CONTENT_LENGTH_LIMIT = 100000;
 
-export function register(selector: vscode.DocumentSelector, client: ITypeScriptServiceClient) {
+export function register(
+	selector: DocumentSelector,
+	client: ITypeScriptServiceClient,
+) {
 	return conditionalRegistration([
 		requireMinVersion(client, minTypeScriptVersion),
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
 		const provider = new DocumentSemanticTokensProvider(client);
 		return vscode.Disposable.from(
 			// register only as a range provider
-			vscode.languages.registerDocumentRangeSemanticTokensProvider(selector, provider, provider.getLegend()),
+			vscode.languages.registerDocumentRangeSemanticTokensProvider(selector.semantic, provider, provider.getLegend()),
 		);
 	});
 }

extensions/typescript-language-features/src/features/signatureHelp.ts

@@ -5,7 +5,9 @@
 
 import * as vscode from 'vscode';
 import type * as Proto from '../protocol';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as Previewer from '../utils/previewer';
 import * as typeConverters from '../utils/typeConverters';
 
@@ -120,12 +122,16 @@ function toTsTriggerReason(context: vscode.SignatureHelpContext): Proto.Signatur
 	}
 }
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerSignatureHelpProvider(selector,
-		new TypeScriptSignatureHelpProvider(client), {
-		triggerCharacters: TypeScriptSignatureHelpProvider.triggerCharacters,
-		retriggerCharacters: TypeScriptSignatureHelpProvider.retriggerCharacters
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerSignatureHelpProvider(selector.syntax,
+			new TypeScriptSignatureHelpProvider(client), {
+			triggerCharacters: TypeScriptSignatureHelpProvider.triggerCharacters,
+			retriggerCharacters: TypeScriptSignatureHelpProvider.retriggerCharacters
+		});
 	});
 }

extensions/typescript-language-features/src/features/smartSelect.ts

@@ -8,6 +8,7 @@ import type * as Proto from '../protocol';
 import { ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
 import { conditionalRegistration, requireMinVersion } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 class SmartSelection implements vscode.SelectionRangeProvider {
@@ -49,12 +50,12 @@ class SmartSelection implements vscode.SelectionRangeProvider {
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
 	return conditionalRegistration([
 		requireMinVersion(client, SmartSelection.minVersion),
 	], () => {
-		return vscode.languages.registerSelectionRangeProvider(selector, new SmartSelection(client));
+		return vscode.languages.registerSelectionRangeProvider(selector.syntax, new SmartSelection(client));
 	});
 }

extensions/typescript-language-features/src/features/tagClosing.ts

@@ -9,6 +9,7 @@ import { ITypeScriptServiceClient } from '../typescriptService';
 import API from '../utils/api';
 import { conditionalRegistration, requireMinVersion, requireConfiguration, Condition } from '../utils/dependentRegistration';
 import { Disposable } from '../utils/dispose';
+import { DocumentSelector } from '../utils/documentSelector';
 import * as typeConverters from '../utils/typeConverters';
 
 class TagClosing extends Disposable {
@@ -151,13 +152,13 @@ function requireActiveDocument(
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	modeId: string,
 	client: ITypeScriptServiceClient,
 ) {
 	return conditionalRegistration([
 		requireMinVersion(client, TagClosing.minVersion),
 		requireConfiguration(modeId, 'autoClosingTags'),
-		requireActiveDocument(selector)
+		requireActiveDocument(selector.syntax)
 	], () => new TagClosing(client));
 }

extensions/typescript-language-features/src/features/typeDefinitions.ts

@@ -4,7 +4,9 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { ITypeScriptServiceClient } from '../typescriptService';
+import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService';
+import { conditionalRegistration, requireSomeCapability } from '../utils/dependentRegistration';
+import { DocumentSelector } from '../utils/documentSelector';
 import DefinitionProviderBase from './definitionProviderBase';
 
 export default class TypeScriptTypeDefinitionProvider extends DefinitionProviderBase implements vscode.TypeDefinitionProvider {
@@ -14,9 +16,13 @@ export default class TypeScriptTypeDefinitionProvider extends DefinitionProvider
 }
 
 export function register(
-	selector: vscode.DocumentSelector,
+	selector: DocumentSelector,
 	client: ITypeScriptServiceClient,
 ) {
-	return vscode.languages.registerTypeDefinitionProvider(selector,
-		new TypeScriptTypeDefinitionProvider(client));
+	return conditionalRegistration([
+		requireSomeCapability(client, ClientCapability.EnhancedSyntax, ClientCapability.Semantic),
+	], () => {
+		return vscode.languages.registerTypeDefinitionProvider(selector.syntax,
+			new TypeScriptTypeDefinitionProvider(client));
+	});
 }

extensions/typescript-language-features/src/features/updatePathsOnRename.ts

@@ -11,7 +11,7 @@ import { ClientCapability, ITypeScriptServiceClient } from '../typescriptService
 import API from '../utils/api';
 import { Delayer } from '../utils/async';
 import { nulToken } from '../utils/cancellation';
-import { conditionalRegistration, requireCapability, requireMinVersion } from '../utils/dependentRegistration';
+import { conditionalRegistration, requireSomeCapability, requireMinVersion } from '../utils/dependentRegistration';
 import { Disposable } from '../utils/dispose';
 import * as fileSchemes from '../utils/fileSchemes';
 import { doesResourceLookLikeATypeScriptFile } from '../utils/languageDescription';
@@ -296,7 +296,7 @@ export function register(
 ) {
 	return conditionalRegistration([
 		requireMinVersion(client, UpdateImportsOnFileRenameHandler.minVersion),
-		requireCapability(client, ClientCapability.Semantic),
+		requireSomeCapability(client, ClientCapability.Semantic),
 	], () => {
 		return new UpdateImportsOnFileRenameHandler(client, fileConfigurationManager, handles);
 	});

extensions/typescript-language-features/src/languageProvider.ts

@@ -5,15 +5,16 @@
 
 import { basename } from 'path';
 import * as vscode from 'vscode';
-import { CachedResponse } from './tsServer/cachedResponse';
 import { DiagnosticKind } from './features/diagnostics';
 import FileConfigurationManager from './features/fileConfigurationManager';
+import { CachedResponse } from './tsServer/cachedResponse';
+import { ClientCapability } from './typescriptService';
 import TypeScriptServiceClient from './typescriptServiceClient';
 import { CommandManager } from './utils/commandManager';
 import { Disposable } from './utils/dispose';
+import { DocumentSelector } from './utils/documentSelector';
 import * as fileSchemes from './utils/fileSchemes';
 import { LanguageDescription } from './utils/languageDescription';
-import { memoize } from './utils/memoize';
 import { TelemetryReporter } from './utils/telemetry';
 import TypingsStatus from './utils/typingsStatus';
 
@@ -39,15 +40,22 @@ export default class LanguageProvider extends Disposable {
 		client.onReady(() => this.registerProviders());
 	}
 
-	@memoize
-	private get documentSelector(): vscode.DocumentFilter[] {
-		const documentSelector = [];
+	private get documentSelector(): DocumentSelector {
+		const semantic: vscode.DocumentFilter[] = [];
+		const syntax: vscode.DocumentFilter[] = [];
 		for (const language of this.description.modeIds) {
-			for (const scheme of fileSchemes.supportedSchemes) {
-				documentSelector.push({ language, scheme });
+			syntax.push({ language });
+			for (const scheme of fileSchemes.semanticSupportedSchemes) {
+				semantic.push({ language, scheme });
 			}
 		}
-		return documentSelector;
+
+		if (this.client.capabilities.has(ClientCapability.EnhancedSyntax)) {
+			return { semantic, syntax };
+		}
+
+		// If we don't have a
+		return { semantic, syntax: semantic };
 	}
 
 	private async registerProviders(): Promise<void> {

extensions/typescript-language-features/src/lazyClientHost.ts

@@ -5,14 +5,13 @@
 
 import * as vscode from 'vscode';
 import { OngoingRequestCancellerFactory } from './tsServer/cancellation';
+import { ILogDirectoryProvider } from './tsServer/logDirectoryProvider';
 import TypeScriptServiceClientHost from './typeScriptServiceClientHost';
 import { flatten } from './utils/arrays';
 import { CommandManager } from './utils/commandManager';
-import * as fileSchemes from './utils/fileSchemes';
 import { standardLanguageDescriptions } from './utils/languageDescription';
 import * as ProjectStatus from './utils/largeProjectStatus';
 import { lazy, Lazy } from './utils/lazy';
-import { ILogDirectoryProvider } from './tsServer/logDirectoryProvider';
 import ManagedFileContextManager from './utils/managedFileContext';
 import { PluginManager } from './utils/plugins';
 
@@ -87,11 +86,8 @@ export function lazilyActivateClient(
 }
 
 function isSupportedDocument(
-	supportedLanguage: string[],
+	supportedLanguage: readonly string[],
 	document: vscode.TextDocument
 ): boolean {
-	if (supportedLanguage.indexOf(document.languageId) < 0) {
-		return false;
-	}
-	return fileSchemes.isSupportedScheme(document.uri.scheme);
+	return supportedLanguage.indexOf(document.languageId) >= 0;
 }

extensions/typescript-language-features/src/tsServer/server.ts

@@ -16,6 +16,10 @@ import { TelemetryReporter } from '../utils/telemetry';
 import Tracer from '../utils/tracer';
 import { TypeScriptVersion } from '../utils/versionProvider';
 
+export enum ExectuionTarget {
+	Semantic,
+	Syntax
+}
 
 export interface ITypeScriptServer {
 	readonly onEvent: vscode.Event<Proto.Event>;
@@ -26,9 +30,9 @@ export interface ITypeScriptServer {
 
 	kill(): void;
 
-	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean }): undefined;
-	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
-	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined;
+	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean, executionTarget?: ExectuionTarget }): undefined;
+	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>>;
+	executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>> | undefined;
 
 	dispose(): void;
 }
@@ -172,9 +176,9 @@ export class ProcessBasedTsServer extends Disposable implements ITypeScriptServe
 		}
 	}
 
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean }): undefined;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean, executionTarget?: ExectuionTarget }): undefined;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>>;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
 		const request = this._requestQueue.createRequest(command, args);
 		const requestInfo: RequestItem = {
 			request,
@@ -272,6 +276,14 @@ export class ProcessBasedTsServer extends Disposable implements ITypeScriptServe
 }
 
 
+interface ExecuteInfo {
+	readonly isAsync: boolean;
+	readonly token?: vscode.CancellationToken;
+	readonly expectsResult: boolean;
+	readonly lowPriority?: boolean;
+	readonly executionTarget?: ExectuionTarget;
+}
+
 class RequestRouter {
 
 	private static readonly sharedCommands = new Set<keyof TypeScriptRequests>([
@@ -284,13 +296,16 @@ class RequestRouter {
 	]);
 
 	constructor(
-		private readonly servers: ReadonlyArray<{ readonly server: ITypeScriptServer, canRun?(command: keyof TypeScriptRequests): void }>,
+		private readonly servers: ReadonlyArray<{
+			readonly server: ITypeScriptServer;
+			canRun?(command: keyof TypeScriptRequests, executeInfo: ExecuteInfo): void;
+		}>,
 		private readonly delegate: TsServerDelegate,
 	) { }
 
-	public execute(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
-		if (RequestRouter.sharedCommands.has(command)) {
-			// Dispatch shared commands to all server but only return from first one one
+	public execute(command: keyof TypeScriptRequests, args: any, executeInfo: ExecuteInfo): Promise<ServerResponse.Response<Proto.Response>> | undefined {
+		if (RequestRouter.sharedCommands.has(command) && typeof executeInfo.executionTarget === 'undefined') {
+			// Dispatch shared commands to all servers but only return from first one
 
 			const requestStates: RequestState.State[] = this.servers.map(() => RequestState.Unresolved);
 
@@ -344,7 +359,7 @@ class RequestRouter {
 		}
 
 		for (const { canRun, server } of this.servers) {
-			if (!canRun || canRun(command)) {
+			if (!canRun || canRun(command, executeInfo)) {
 				return server.executeImpl(command, args, executeInfo);
 			}
 		}
@@ -420,9 +435,9 @@ export class GetErrRoutingTsServer extends Disposable implements ITypeScriptServ
 		this.mainServer.kill();
 	}
 
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean }): undefined;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean, executionTarget?: ExectuionTarget }): undefined;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>>;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
 		return this.router.execute(command, args, executeInfo);
 	}
 }
@@ -490,7 +505,12 @@ export class SyntaxRoutingTsServer extends Disposable implements ITypeScriptServ
 			[
 				{
 					server: this.syntaxServer,
-					canRun: (command) => {
+					canRun: (command, execInfo) => {
+						switch (execInfo.executionTarget) {
+							case ExectuionTarget.Semantic: return false;
+							case ExectuionTarget.Syntax: return true;
+						}
+
 						if (SyntaxRoutingTsServer.syntaxAlwaysCommands.has(command)) {
 							return true;
 						}
@@ -556,9 +576,9 @@ export class SyntaxRoutingTsServer extends Disposable implements ITypeScriptServ
 		this.semanticServer.kill();
 	}
 
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean }): undefined;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
-	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean, executionTarget?: ExectuionTarget }): undefined;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>>;
+	public executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, executionTarget?: ExectuionTarget }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
 		return this.router.execute(command, args, executeInfo);
 	}
 }

extensions/typescript-language-features/src/typescriptService.ts

@@ -6,6 +6,7 @@
 import * as vscode from 'vscode';
 import BufferSyncSupport from './features/bufferSyncSupport';
 import * as Proto from './protocol';
+import { ExectuionTarget } from './tsServer/server';
 import API from './utils/api';
 import { TypeScriptServiceConfiguration } from './utils/configuration';
 import { PluginManager } from './utils/plugins';
@@ -82,11 +83,24 @@ export type TypeScriptRequests = StandardTsServerRequests & NoResponseTsServerRe
 export type ExecConfig = {
 	readonly lowPriority?: boolean;
 	readonly nonRecoverable?: boolean;
-	readonly cancelOnResourceChange?: vscode.Uri
+	readonly cancelOnResourceChange?: vscode.Uri;
+	readonly executionTarget?: ExectuionTarget;
 };
 
 export enum ClientCapability {
+	/**
+	 * Basic syntax server. All clients should support this.
+	 */
 	Syntax,
+
+	/**
+	 * Advanced syntax server that can provide single file IntelliSense.
+	 */
+	EnhancedSyntax,
+
+	/**
+	 * Complete, multi-file semantic server
+	 */
 	Semantic,
 }
 
@@ -138,7 +152,7 @@ export interface ITypeScriptServiceClient {
 	readonly onTypesInstallerInitializationFailed: vscode.Event<Proto.TypesInstallerInitializationFailedEventBody>;
 
 	readonly capabilities: ClientCapabilities;
-	readonly onDidChangeCapabilities: vscode.Event<ClientCapabilities>;
+	readonly onDidChangeCapabilities: vscode.Event<void>;
 
 	onReady(f: () => void): Promise<void>;
 

extensions/typescript-language-features/src/typescriptServiceClient.ts

@@ -207,13 +207,18 @@ export default class TypeScriptServiceClient extends Disposable implements IType
 	}
 
 	public get capabilities() {
+		if (this.apiVersion.gte(API.v400)) {
+			return new ClientCapabilities(
+				ClientCapability.Syntax,
+				ClientCapability.EnhancedSyntax,
+				ClientCapability.Semantic);
+		}
 		return new ClientCapabilities(
-			ClientCapability.Semantic,
 			ClientCapability.Syntax,
-		);
+			ClientCapability.Semantic);
 	}
 
-	private readonly _onDidChangeCapabilities = this._register(new vscode.EventEmitter<ClientCapabilities>());
+	private readonly _onDidChangeCapabilities = this._register(new vscode.EventEmitter<void>());
 	readonly onDidChangeCapabilities = this._onDidChangeCapabilities.event;
 
 	private cancelInflightRequestsForResource(resource: vscode.Uri): void {
@@ -437,7 +442,7 @@ export default class TypeScriptServiceClient extends Disposable implements IType
 
 		this._onReady!.resolve();
 		this._onTsServerStarted.fire({ version: version, usedApiVersion: apiVersion });
-
+		this._onDidChangeCapabilities.fire();
 		return this.serverState;
 	}
 
@@ -608,27 +613,23 @@ export default class TypeScriptServiceClient extends Disposable implements IType
 	}
 
 	public normalizedPath(resource: vscode.Uri): string | undefined {
-		if (resource.scheme === fileSchemes.walkThroughSnippet || resource.scheme === fileSchemes.untitled) {
-			const dirName = path.dirname(resource.path);
-			const fileName = this.inMemoryResourcePrefix + path.basename(resource.path);
-			return resource.with({ path: path.posix.join(dirName, fileName), query: '' }).toString(true);
-		}
-
-		if (resource.scheme !== fileSchemes.file) {
-			return undefined;
-		}
-
-		let result = resource.fsPath;
-		if (!result) {
-			return undefined;
-		}
+		switch (resource.scheme) {
+			case fileSchemes.file:
+				{
+					let result = resource.fsPath;
+					if (!result) {
+						return undefined;
+					}
+					result = path.normalize(result);
 
-		if (resource.scheme === fileSchemes.file) {
-			result = path.normalize(result);
+					// Both \ and / must be escaped in regular expressions
+					return result.replace(new RegExp('\\' + this.pathSeparator, 'g'), '/');
+				}
+			default:
+				{
+					return this.inMemoryResourcePrefix + resource.toString(true);
+				}
 		}
-
-		// Both \ and / must be escaped in regular expressions
-		return result.replace(new RegExp('\\' + this.pathSeparator, 'g'), '/');
 	}
 
 	public toPath(resource: vscode.Uri): string | undefined {
@@ -735,9 +736,9 @@ export default class TypeScriptServiceClient extends Disposable implements IType
 		});
 	}
 
-	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean }): undefined;
-	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
-	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
+	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: false, lowPriority?: boolean, requireSemantic?: boolean }): undefined;
+	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, requireSemantic?: boolean }): Promise<ServerResponse.Response<Proto.Response>>;
+	private executeImpl(command: keyof TypeScriptRequests, args: any, executeInfo: { isAsync: boolean, token?: vscode.CancellationToken, expectsResult: boolean, lowPriority?: boolean, requireSemantic?: boolean }): Promise<ServerResponse.Response<Proto.Response>> | undefined {
 		this.bufferSyncSupport.beforeCommand(command);
 		const runningServerState = this.service();
 		return runningServerState.server.executeImpl(command, args, executeInfo);

extensions/typescript-language-features/src/utils/dependentRegistration.ts

@@ -96,12 +96,12 @@ export function requireConfiguration(
 	);
 }
 
-export function requireCapability(
+export function requireSomeCapability(
 	client: ITypeScriptServiceClient,
-	requiredCapability: ClientCapability,
+	...capabilities: readonly ClientCapability[]
 ) {
 	return new Condition(
-		() => client.capabilities.has(requiredCapability),
+		() => capabilities.some(requiredCapability => client.capabilities.has(requiredCapability)),
 		client.onDidChangeCapabilities
 	);
 }

extensions/typescript-language-features/src/utils/documentSelector.ts

+/*---------------------------------------------------------------------------------------------
+ *  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';
+
+export interface DocumentSelector {
+	/**
+	 * Selector for files which only require a basic syntax server.
+	 */
+	readonly syntax: vscode.DocumentFilter[];
+
+	/**
+	 * Selector for files which require semantic server support.
+	 */
+	readonly semantic: vscode.DocumentFilter[];
+}

extensions/typescript-language-features/src/utils/fileSchemes.ts

@@ -8,12 +8,7 @@ export const untitled = 'untitled';
 export const git = 'git';
 export const walkThroughSnippet = 'walkThroughSnippet';
 
-export const supportedSchemes = [
+export const semanticSupportedSchemes = [
 	file,
 	untitled,
-	walkThroughSnippet
 ];
-
-export function isSupportedScheme(scheme: string): boolean {
-	return supportedSchemes.indexOf(scheme) >= 0;
-}

src/vs/base/common/json.ts

@@ -72,6 +72,7 @@ export interface JSONScanner {
 }
 
 
+
 export interface ParseError {
 	error: ParseErrorCode;
 	offset: number;