# libtmux::Server::check_file

- **Module:** libtmux::Server
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/server.hpp#L379
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-server-check_file/

```
libtmux::Server::check_file(file: const std::filesystem::path &) -> expected< void, CommandFailure >
```

Parse the same file and report what tmux would refuse in it, running none of it.

This is how a program checks a configuration it is about to apply without applying half of it first.