Метод isFileSync
bool isFileSync(Синхронно проверяет, возвращает ли typeSync(path) FileSystemEntityType.FILE.
Исходный код
static bool isFileSync(String path) =>
(_getTypeSync(path, true) == FileSystemEntityType.FILE._type);
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https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/isFileSync.html