# field_types.FormatIdentityType

- **Module:** field_types
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-ts/blob/46cccfef2a546de55ce8b308249b8c76339089a0/packages/libtmux/src/field_types.ts#L234
- **Page:** https://libtmux.org/en/ts/latest/reference/field_types-formatidentitytype/

```ts
type FormatIdentityType = "pane-id" | "session-id" | "window-id"
```

The three shapes that name a tmux object rather than describe one.

A field of one of these types carries an id a handle can be rebuilt from,
which is why the row types refuse to report them as empty.