# `OpenUI.Library.Callable`
[🔗](https://github.com/ideia4it/openui/blob/v0.1.1/lib/openui/library/callable.ex#L1)

A custom function or action of a library.

`impl` is set only for functions: it receives one map keyed by the param
names and returns the result. Actions run in the host, never here.

# `t`

```elixir
@type t() :: %OpenUI.Library.Callable{
  description: String.t(),
  impl: (map() -> term()) | nil,
  name: String.t(),
  params: [OpenUI.Library.Prop.t()],
  returns: map() | nil,
  signature: String.t()
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*