diff --git a/dist/model/FileTreeController.js b/dist/model/FileTreeController.js
index 37c5d1ffedd5aff0258dec41b1b5cedb240aa3a6..365c42ef4c824bfd13d14f0d09226929af625c73 100644
--- a/dist/model/FileTreeController.js
+++ b/dist/model/FileTreeController.js
@@ -1052,8 +1052,8 @@ var FileTreeController = class {
 		this.#setExpandedPaths(expandedPaths);
 		return focusCandidate ?? this.#focusedPath;
 	}
-	#emit() {
-		for (const listener of this.#listeners) listener();
+	#emit(event) {
+		for (const listener of this.#listeners) listener(event);
 	}
 	#emitMutation(event) {
 		this.#mutationListeners.get(event.operation)?.forEach((listener) => {
@@ -1149,7 +1149,7 @@ var FileTreeController = class {
 			const searchFocusCandidate = this.#searchValue != null && this.#searchValue.length > 0 ? this.#refreshActiveSearchState() : this.#searchValue === "" ? this.#focusedPath : focusPathCandidate;
 			const shouldBuildFullProjection = this.#searchValue != null || event.operation !== "expand" && event.operation !== "collapse";
 			this.#rebuildVisibleProjection(searchFocusCandidate, shouldBuildFullProjection);
-			this.#emit();
+			this.#emit(event);
 			const mutationEvent = toTreesMutationEvent(event);
 			if (mutationEvent != null) this.#emitMutation(mutationEvent);
 		});
diff --git a/dist/model/internalTypes.d.ts b/dist/model/internalTypes.d.ts
index 5b0fdd5a3b483439ae256795f3dad5a32182ab78..073c6f21edc20ce5bd44b122fe02b83de802b887 100644
--- a/dist/model/internalTypes.d.ts
+++ b/dist/model/internalTypes.d.ts
@@ -4,7 +4,10 @@ import { FileTreeCompositionOptions, FileTreePublicId, FileTreeRenderOptions, Fi
 import { FileTreeController } from "./FileTreeController.js";
 
 //#region src/model/internalTypes.d.ts
-type FileTreeControllerListener = () => void;
+type FileTreeControllerListener = (event?: {
+  operation: 'expand' | 'collapse';
+  path: string;
+}) => void;
 interface FileTreeStickyRowCandidate {
   row: FileTreeVisibleRow;
   subtreeEndIndex: number;
diff --git a/dist/model/publicTypes.d.ts b/dist/model/publicTypes.d.ts
index 84a7e2d14f67c1aad8230f19a3426ab7403f378e..752e262e6d2d8a836931b7b83a93d89a75e6209c 100644
--- a/dist/model/publicTypes.d.ts
+++ b/dist/model/publicTypes.d.ts
@@ -167,6 +167,10 @@ type FileTreeOptionSurface = FileTreeRenderOptions & {
   gitStatus?: readonly GitStatusEntry[];
   id?: string;
   icons?: FileTreeIcons;
+  onExpansionChange?: (change: {
+    expanded: boolean;
+    path: FileTreePublicId;
+  }) => void;
   onSelectionChange?: FileTreeSelectionChangeListener;
   renderRowDecoration?: FileTreeRowDecorationRenderer;
   search?: boolean;
diff --git a/dist/render/FileTree.js b/dist/render/FileTree.js
index 6db15e51b833192f79b71a15febe1612a4c185d0..36a4e6ac527595849c1db0e6bbebb475b6030b7b 100644
--- a/dist/render/FileTree.js
+++ b/dist/render/FileTree.js
@@ -63,6 +63,7 @@ var FileTree = class {
 	#composition;
 	#controller;
 	#id;
+	#onExpansionChange;
 	#onSelectionChange;
 	#renderRowDecoration;
 	#renamingEnabled;
@@ -80,16 +81,18 @@ var FileTree = class {
 	#appliedUnsafeCSS;
 	#selectionVersion;
 	#selectionSubscription = null;
+	#expansionSubscription = null;
 	#wrapper;
 	#wroteHostItemHeight = false;
 	#wroteHostDensityFactor = false;
 	constructor(options) {
-		const { composition, density, fileTreeSearchMode, gitStatus, id, initialSearchQuery, icons, itemHeight, onSearchChange, onSelectionChange, overscan, renderRowDecoration, renaming, search, searchBlurBehavior, searchFakeFocus, stickyFolders, unsafeCSS, initialVisibleRowCount,...controllerOptions } = options;
+		const { composition, density, fileTreeSearchMode, gitStatus, id, initialSearchQuery, icons, itemHeight, onExpansionChange, onSearchChange, onSelectionChange, overscan, renderRowDecoration, renaming, search, searchBlurBehavior, searchFakeFocus, stickyFolders, unsafeCSS, initialVisibleRowCount,...controllerOptions } = options;
 		this.#composition = composition;
 		this.#id = createClientId(id);
 		this.#gitStatusState = resolveFileTreeGitStatusState(gitStatus);
 		this.#icons = icons;
 		this.#unsafeCSS = unsafeCSS;
+		this.#onExpansionChange = onExpansionChange;
 		this.#onSelectionChange = onSelectionChange;
 		this.#renderRowDecoration = renderRowDecoration;
 		this.#renamingEnabled = renaming != null && renaming !== false;
@@ -114,6 +117,10 @@ var FileTree = class {
 		this.#selectionSubscription = this.#onSelectionChange == null ? null : this.subscribe(() => {
 			this.#emitSelectionChange();
 		});
+		this.#expansionSubscription = this.#onExpansionChange == null ? null : this.#controller.subscribe((event) => {
+			if (event?.operation !== "expand" && event?.operation !== "collapse") return;
+			this.#onExpansionChange?.({ path: event.path, expanded: event.operation === "expand" });
+		});
 	}
 	unmount() {
 		if (this.#wrapper != null) {
@@ -133,6 +140,8 @@ var FileTree = class {
 		this.unmount();
 		this.#selectionSubscription?.();
 		this.#selectionSubscription = null;
+		this.#expansionSubscription?.();
+		this.#expansionSubscription = null;
 		this.#controller.destroy();
 	}
 	getFileTreeContainer() {
