Use 'auto' for default TS preference values

extensions/typescript-language-features/package.json

@@ -430,36 +430,44 @@
         "javascript.preferences.quoteStyle": {
           "type": "string",
           "enum": [
+            "auto",
             "single",
             "double"
           ],
+          "default": "auto",
           "description": "%typescript.preferences.quoteStyle%",
           "scope": "window"
         },
         "typescript.preferences.quoteStyle": {
           "type": "string",
           "enum": [
+            "auto",
             "single",
             "double"
           ],
+          "default": "auto",
           "description": "%typescript.preferences.quoteStyle%",
           "scope": "window"
         },
         "javascript.preferences.importModuleSpecifier": {
           "type": "string",
           "enum": [
+            "auto",
             "relative",
             "non-relative"
           ],
+          "default": "auto",
           "description": "%typescript.preferences.importModuleSpecifier%",
           "scope": "window"
         },
         "typescript.preferences.importModuleSpecifier": {
           "type": "string",
           "enum": [
+            "auto",
             "relative",
             "non-relative"
           ],
+          "default": "auto",
           "description": "%typescript.preferences.importModuleSpecifier%",
           "scope": "window"
         }

extensions/typescript-language-features/package.nls.json

@@ -55,6 +55,6 @@
 	"taskDefinition.tsconfig.description": "The tsconfig file that defines the TS build.",
 	"javascript.suggestionActions.enabled": "Enable/disable suggestion diagnostics for JavaScript files in the editor. Requires TypeScript >= 2.8",
 	"typescript.suggestionActions.enabled": "Enable/disable suggestion diagnostics for TypeScript files in the editor. Requires TypeScript >= 2.8",
-	"typescript.preferences.quoteStyle": "Preferred quote style ('single' or 'double') to use for quick fixes. Requires TS >= 2.9",
-	"typescript.preferences.importModuleSpecifier": "Preferred ('relative' or 'non-relative') for auto imports. Requires TS >= 2.9"
+	"typescript.preferences.quoteStyle": "Preferred quote style to use for quick fixes: 'single' quotes, 'double' quotes, or 'auto' infer quote type from existing imports. Requires TS >= 2.9",
+	"typescript.preferences.importModuleSpecifier": "Preferred path style for auto imports: 'relative' paths, 'non-relative' paths, or 'auto' infer the shortest path type. Requires TS >= 2.9"
 }
\ No newline at end of file

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

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { workspace as Workspace, FormattingOptions, TextDocument, CancellationToken, window, Disposable, workspace } from 'vscode';
+import { workspace as Workspace, FormattingOptions, TextDocument, CancellationToken, window, Disposable, workspace, WorkspaceConfiguration } from 'vscode';
 
 import * as Proto from '../protocol';
 import { ITypeScriptServiceClient } from '../typescriptService';
@@ -156,12 +156,28 @@ export default class FileConfigurationManager {
 			document.uri);
 
 		return {
-			quotePreference: config.get<'single' | 'double' | undefined>('quoteStyle'),
-			importModuleSpecifierPreference: config.get<'relative' | 'non-relative' | undefined>('importModuleSpecifier')
+			quotePreference: getQuoteStylePreference(config),
+			importModuleSpecifierPreference: getImportModuleSpecifierPreference(config)
 		};
 	}
 }
 
+function getQuoteStylePreference(config: WorkspaceConfiguration) {
+	switch (config.get<string>('quoteStyle')) {
+		case 'single': return 'single';
+		case 'double': return 'double';
+		default: return undefined;
+	}
+}
+
+function getImportModuleSpecifierPreference(config: WorkspaceConfiguration) {
+	switch (config.get<string>('importModuleSpecifier')) {
+		case 'relative': return 'relative';
+		case 'non-relative': return 'non-relative';
+		default: return undefined;
+	}
+}
+
 function isTypeScriptDocument(document: TextDocument) {
 	return document.languageId === languageIds.typescript || document.languageId === languageIds.typescriptreact;
 }