Where can I find documentation on `JsEvent`?

Where can I find documentation on the `JsEvent` method?

```jsx
declare const JsEvent: (Event: string, item: object, context?: IContext) => Promise;
```

The [UI-SDK page](https://alteryx.github.io/react-comms/#/Utils/JsEvent) only shows how to list all the supported events, but I can't find anything that explains what these events do, their possible options, and their outputs. More specifically, is it possible to specify "FileBrowse" to filter for something like "\*.csv" files instead of the default "\*.yxmd;\*.wmdl;\*.yxwz;\*.yxmc;\*.yxzp;\*.yxi;\*.yxwg"?

```jsx
const filePath = await JsEvent('FileBrowse', {})
// What goes here? ↑
```

Or is there an analogous "DirectoryBrowse" event to select directories instead of files, like the built-in Directory tool?