@wordpress/block-editor/src/components/block-visibility/index.js

Generic block editor.

export { default as BlockVisibilityModal } from './modal';
export { default as useBlockVisibility } from './use-block-visibility';

import BlockVisibilityToolbarDefault from './toolbar';
import BlockVisibilityViewportToolbar from './viewport-toolbar';

import BlockVisibilityMenuItemDefault from './menu-item';
import BlockVisibilityViewportMenuItem from './viewport-menu-item';

const hasViewportVisibilityExperiment =
	typeof window !== 'undefined' &&
	window.__experimentalHideBlocksBasedOnScreenSize;

// Conditionally export the viewport versions when the experimental flag is enabled.
export const BlockVisibilityMenuItem = hasViewportVisibilityExperiment
	? BlockVisibilityViewportMenuItem
	: BlockVisibilityMenuItemDefault;

export const BlockVisibilityToolbar = hasViewportVisibilityExperiment
	? BlockVisibilityViewportToolbar
	: BlockVisibilityToolbarDefault;