# tmux.ServerHookValues.ClientSessionChanged

- **Module:** tmux.ServerHookValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/option_generated.go#L3565
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-serverhookvalues-clientsessionchanged/

```
tmux.ServerHookValues.ClientSessionChanged() -> OptionValue[SparseArray[string]]
```

ClientSessionChanged returns materialized "client-session-changed" as [OptionValue] with value type OptionValue[SparseArray[string]] from global session-scope hook values; it does not query tmux. Available as COMMAND since tmux 3.2a. Its present SparseArray value preserves assigned tmux indexes, including gaps.