# File provisioning

Mosaic introduces concept of "file provisioning". **This is a feature of**[ **extensions**](broken://pages/-MXlBPS6g2vhjkTrAhpH).

{% hint style="info" %}
**To provide a file** - means to add a file into the "override" tool-chain with a lowest priority. This would make it discoverable by compiler, while any theme will be able to easily override it.
{% endhint %}

This is commonly used by extensions which replace the web application's entry point. It makes it possible to compile an application using some other HTML entry-point without manually defining it in a theme.

To provide a file in some mosaic extension, set the `mosaic.provide` field of its `package.json` equal to an array, and populate it with desired path to provision.

{% code title="package.json" %}

```javascript
{
    "mosaic": {
        "provide": ["public/index.html"]
    }
}
```

{% endcode %}


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