extensions/typescript-language-features/src/languageFeatures/fileConfigurationManager.ts/FileConfigurationManager/getFileOptions
class FileConfigurationManager:	private getFileOptions(
		document: vscode.TextDocument,
		options: vscode.FormattingOptions
	): FileConfiguration {
		return {
			formatOptions: this.getFormatOptions(document, options),
			preferences: this.getPreferences(document)
		};
	}