# errors.TmuxCommandError.stderrIncludes

- **Module:** errors.TmuxCommandError
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ts/blob/3fe1ca654b81b8cbf4a13b777a001a3298c87a6f/packages/libtmux/src/errors.ts#L465
- **Page:** https://libtmux.org/en/ts/latest/reference/errors-tmuxcommanderror-stderrincludes/

```
errors.TmuxCommandError.stderrIncludes(phrase: : string) -> boolean
```

Whether tmux's own message contains a phrase, without message parsing at call sites.