Update VS Code refactoring support for new TS 4.0 api

Adopts changes from https://github.com/microsoft/TypeScript/pull/37871/

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

@@ -13,6 +13,13 @@ import { isTypeScriptDocument } from '../utils/languageModeIds';
 import { equals } from '../utils/objects';
 import { ResourceMap } from '../utils/resourceMap';
 
+namespace Experimental {
+	// https://github.com/microsoft/TypeScript/pull/37871/
+	export interface UserPreferences extends Proto.UserPreferences {
+		readonly provideRefactorNotApplicableReason?: boolean;
+	}
+}
+
 interface FileConfiguration {
 	readonly formatOptions: Proto.FormatCodeSettings;
 	readonly preferences: Proto.UserPreferences;
@@ -170,7 +177,7 @@ export default class FileConfigurationManager extends Disposable {
 			isTypeScriptDocument(document) ? 'typescript.preferences' : 'javascript.preferences',
 			document.uri);
 
-		const preferences: Proto.UserPreferences = {
+		const preferences: Experimental.UserPreferences = {
 			quotePreference: this.getQuoteStylePreference(preferencesConfig),
 			importModuleSpecifierPreference: getImportModuleSpecifierPreference(preferencesConfig),
 			importModuleSpecifierEnding: getImportModuleSpecifierEndingPreference(preferencesConfig),
@@ -178,6 +185,7 @@ export default class FileConfigurationManager extends Disposable {
 			providePrefixAndSuffixTextForRename: preferencesConfig.get<boolean>('renameShorthandProperties', true) === false ? false : preferencesConfig.get<boolean>('useAliasesForRenames', true),
 			allowRenameOfImportPath: true,
 			includeAutomaticOptionalChainCompletions: config.get<boolean>('suggest.includeAutomaticOptionalChainCompletions', true),
+			provideRefactorNotApplicableReason: true,
 		};
 
 		return preferences;

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

@@ -22,7 +22,7 @@ const localize = nls.loadMessageBundle();
 
 namespace Experimental {
 	export interface RefactorActionInfo extends Proto.RefactorActionInfo {
-		readonly error?: string
+		readonly notApplicableReason?: string;
 	}
 
 	export type RefactorTriggerReason = 'implicit' | 'invoked';
@@ -312,16 +312,16 @@ class TypeScriptRefactorProvider implements vscode.CodeActionProvider {
 		const codeAction = new vscode.CodeAction(action.description, TypeScriptRefactorProvider.getKind(action));
 
 		// https://github.com/microsoft/TypeScript/pull/37871
-		if (action.error) {
-			codeAction.disabled = { reason: action.error };
-			return codeAction;
+		if (action.notApplicableReason) {
+			codeAction.disabled = { reason: action.notApplicableReason };
+		} else {
+			codeAction.command = {
+				title: action.description,
+				command: ApplyRefactoringCommand.ID,
+				arguments: [document, info.name, action.name, rangeOrSelection],
+			};
 		}
 
-		codeAction.command = {
-			title: action.description,
-			command: ApplyRefactoringCommand.ID,
-			arguments: [document, info.name, action.name, rangeOrSelection],
-		};
 		codeAction.isPreferred = TypeScriptRefactorProvider.isPreferred(action, allActions);
 		return codeAction;
 	}