wp-calypso/client/state/comments/selectors/get-expansions-for-post.js

import { getStateKey } from 'calypso/state/comments/utils';

import 'calypso/state/comments/init';

export function getExpansionsForPost( state, siteId, postId ) {
	return state.comments.expansions[ getStateKey( siteId, postId ) ];
}