# LibTmux.Error.certainty/0

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Elixir
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-elixir/blob/66b9b1c3f3f3186428abdfda2c76f5cf87446710/lib/libtmux/error.ex#L19
- **Page:** https://libtmux.org/en/elixir/latest/reference/libtmux-error-certainty-0/

```
@type certainty() ::
        :no_write | :acknowledged | :observed | :unknown
```

Evidence about effects, independent of whether cleanup or arbitrary program completion is proved.