---
layout: stdlib-reference
---

# attribute [deprecated]

## Description

Mark a declaration as deprecated.

## Signature

<pre>
[<a href="deprecated.html">deprecated</a>(<a href="deprecated.html#decl-message" class="code_param">message</a> : <a href="../types/string-0/index.html" class="code_type">String</a>)]
</pre>

## Parameters

####  <a id="decl-message"></a>message  : [String](../types/string-0/index.html)
The diagnostic message to show when the declaration is used.