Метод isFile
Future<bool> isFile(Проверяет, возвращает ли type(path) FileSystemEntityType.FILE.
Исходный код
static Future<bool> isFile(String path) => _getTypeAsync(path, true)
.then((type) => (type == FileSystemEntityType.FILE._type));
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https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/isFile.html