after static method
Implementation
static Future after(String cmd) async {
final task = _map[cmd];
if (task == null) return;
if (task.completer.isCompleted) return;
/*
if (cmd.startsWith('upload ')) {
final hash = cmd.substring(7);
if (FData.cache.containsKey(hash)) {
return completer.complete();
}
}
*/
return task.completer;
}