# tmux.FormatValues.WindowStackIndex

- **Module:** tmux.FormatValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/format_generated.go#L862
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-formatvalues-windowstackindex/

```
tmux.FormatValues.WindowStackIndex() -> (int, bool)
```

WindowStackIndex returns tmux #{window_stack_index} as int from materialized window-scoped fields (tmux 3.2a or later).