# tmux.ServerOptionValues.ExtendedKeysFormat

- **Module:** tmux.ServerOptionValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/option_generated.go#L1898
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-serveroptionvalues-extendedkeysformat/

```
tmux.ServerOptionValues.ExtendedKeysFormat() -> OptionValue[ExtendedKeysFormat]
```

ExtendedKeysFormat returns materialized "extended-keys-format" as [OptionValue] with value type OptionValue[ExtendedKeysFormat] from server option values; it does not query tmux. Available as CHOICE since tmux 3.5 (choices: "csi-u", "xterm"); set it with [Server.SetExtendedKeysFormat].