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diff --git a/native/utils/drawer-utils.react.js b/native/utils/drawer-utils.react.js
new file mode 100644
--- /dev/null
+++ b/native/utils/drawer-utils.react.js
@@ -0,0 +1,75 @@
+// @flow
+
+import { threadTypeIsCommunityRoot } from 'lib/types/thread-types-enum.js';
+import type { ThreadInfo } from 'lib/types/thread-types.js';
+import type { CommunityDrawerItemData } from 'lib/utils/drawer-utils.react.js';
+
+import type { TextStyle } from '../types/styles.js';
+
+export type CommunityDrawerItemDataFlattened = {
+ +threadInfo: ThreadInfo,
+ +hasSubchannelsButton: boolean,
+ +labelStyle: TextStyle,
+ +hasChildren: boolean,
+ +itemStyle: {
+ +indentation: number,
+ +background: 'none' | 'beginning' | 'middle' | 'end',
+ },
+};
+
+const defaultIndentation = 8;
+const addedIndentation = 16;
+
+function flattenDrawerItemsData(
+ data: $ReadOnlyArray<CommunityDrawerItemData<TextStyle>>,
+ expanded: $ReadOnlyArray<string>,
+ prevIndentation: ?number,
+): $ReadOnlyArray<CommunityDrawerItemDataFlattened> {
+ let results = [];
+
+ for (const item of data) {
+ const isOpen = expanded.includes(item.threadInfo.id);
+ const isCommunity = threadTypeIsCommunityRoot(item.threadInfo.type);
+
+ let background = 'middle';
+ if (isCommunity) {
+ background = isOpen ? 'beginning' : 'none';
+ }
+
+ let indentation = defaultIndentation;
+ if (!isCommunity && prevIndentation) {
+ indentation = prevIndentation + addedIndentation;
+ }
+
+ results.push({
+ threadInfo: item.threadInfo,
+ hasSubchannelsButton: item.hasSubchannelsButton,
+ labelStyle: item.labelStyle,
+ hasChildren: item.itemChildren?.length > 0,
+ itemStyle: {
+ indentation,
+ background,
+ },
+ });
+
+ if (!isOpen) {
+ continue;
+ }
+ results = results.concat(
+ flattenDrawerItemsData(item.itemChildren, expanded, indentation),
+ );
+ if (isCommunity) {
+ results[results.length - 1] = {
+ ...results[results.length - 1],
+ itemStyle: {
+ ...results[results.length - 1].itemStyle,
+ background: 'end',
+ },
+ };
+ }
+ }
+
+ return results;
+}
+
+export { flattenDrawerItemsData };

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