# tmux_snapshot:requirement/0

- **Package:** libtmux_erlang
- **Language:** Erlang
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-erlang/blob/d1b6308440cf9eb8f6647e7ae434bce60e849368/apps/libtmux_erlang/src/tmux_snapshot.erl#L34
- **Page:** https://libtmux.org/en/erlang/latest/reference/t-tmux_snapshot-requirement-0/

```
-type requirement() ::
          {collection, tmux_schema:entity()} |
          {field | relation, tmux_schema:entity(), atom()}.
```

A collection, field or complete relationship needed for faithful local evaluation.