Project: /docs/reference/js/_project.yaml
Book: /docs/reference/_book.yaml
page_type: reference

{% comment %}
DO NOT EDIT THIS FILE!
This is generated by the JS SDK team, and any local changes will be
overwritten. Changes should be made in the source code at
https://github.com/firebase/firebase-js-sdk
{% endcomment %}

# TemplateFunctionDeclarationsTool interface
> This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.
> 

A piece of code that enables the system to interact with external systems.

<b>Signature:</b>

```typescript
export interface TemplateFunctionDeclarationsTool 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [functionDeclarations](./ai.templatefunctiondeclarationstool.md#templatefunctiondeclarationstoolfunctiondeclarations) | [TemplateFunctionDeclaration](./ai.templatefunctiondeclaration.md#templatefunctiondeclaration_interface)<!-- -->\[\] | <b><i>(Public Preview)</i></b> Optional. One or more function declarations to be passed to the server-side template execution. |

## TemplateFunctionDeclarationsTool.functionDeclarations

> This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.
> 

Optional. One or more function declarations to be passed to the server-side template execution.

<b>Signature:</b>

```typescript
functionDeclarations?: TemplateFunctionDeclaration[];
```