function isSupportedSourceFileName(fileName) {
        if (!fileName) {
            return false;
        }
        for (var _i = 0, supportedExtensions_1 = ts.supportedExtensions; _i < supportedExtensions_1.length; _i++) {
            var extension = supportedExtensions_1[_i];
            if (fileExtensionIs(fileName, extension)) {
                return true;
            }
        }
        return false;
    }
List of supported extensions in order of file resolution precedence.