extensions/typescript-language-features/src/languageFeatures/fileConfigurationManager.ts/FileConfigurationManager/getQuoteStylePreference
class FileConfigurationManager:	private getQuoteStylePreference(config: vscode.WorkspaceConfiguration) {
		switch (config.get<string>('quoteStyle')) {
			case 'single': return 'single';
			case 'double': return 'double';
			default: return this.client.apiVersion.gte(API.v333) ? 'auto' : undefined;
		}
	}