ToolbarItem Component Returns Undefined

[TeamDNK]

Describe the bug
The ToolbarItem component throws an error when it is called. For simplicity, I am using the Button component as the rendered component. I have tested the other toolbar components such as ToolbarGroup and ToolbarButton and they have worked perfectly, but for some reason the ToolbarItem returns undefined.

// button.js

import { Button } from '@wordpress/components'
import { Toolbar, ToolbarItem } from '@wordpress/components';

function ToolbarItemButton() {
    return (
        <Toolbar label="Options">
            <ToolbarItem as={ Button } onClick={() => alert('Success.')}>Experiment</ToolbarItem>
        </Toolbar>
    )
}

export default ToolbarItemButton

// index.js

import domReady from '@wordpress/dom-ready';
import ToolbarItemButton from './button.js'
import { render } from '@wordpress/element';

domReady( function() {
    render(<ToolbarItemButton />, document.querySelector('#toolbar-button') )
})

Error Message

[Error] Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `ToolbarItemButton`.
	commitRootImpl (react-dom.js:22842)
	commitRootImpl
	unstable_runWithPriority (react.js:2820)
	commitRoot (react-dom.js:22552)
	commitRoot
	scheduleUpdateOnFiber (react-dom.js:21559)
	scheduleRootUpdate (react-dom.js:24457)
	(anonymous function) (react-dom.js:25101)
	unbatchedUpdates (react-dom.js:21825)
	legacyRenderSubtreeIntoContainer (react-dom.js:25100)
	(anonymous function) (index.js:9326)

Editor version (please complete the following information):

• WordPress version: 5.5.3
• Gutenberg default

Desktop (please complete the following information):

• OS: macOS Catalina 10.15.7
• Browser: Safari 14

[talldan]

@TeamDNK In WordPress 5.5.3 the component was still experimental (__experimentalToolbarItem). ToolbarItem will be made stable in WordPress 5.6 - #23316.