*[<Null safety>](https://dart.dev/null-safety)*
VmoFile.readOnly(Vmo _vmo, VmoSharingMode _sharingMode)
VmoFile.readOnly(this._vmo, this._sharingMode) : super.readOnly(() { int size = _vmo.getSize().size; return _vmo.read(size).bytesAsUint8List(); });