FileSaver.saveAsync

void saveAsync(int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.FileProgressCallback progressCallback =  null,  gio.types.AsyncReadyCallback callback =  null)

Saves asynchronously the buffer into the file. See the #GAsyncResult documentation to know how to use this function.

Parameters

`ioPriority`	the I/O priority of the request. E.g. [glib.types.PRIORITY_LOW], [glib.types.PRIORITY_DEFAULT] or [glib.types.PRIORITY_HIGH].
`cancellable`	optional #GCancellable object, null to ignore.
`progressCallback`	function to call back with progress information, or null if progress information is not needed.
`callback`	a #GAsyncReadyCallback to call when the request is satisfied.