fix(deps): update dependency react-resizable-panels to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
react-resizable-panels (source)	^3.0.6 → ^4.0.0

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Release Notes

bvaughn/react-resizable-panels (react-resizable-panels)

v4.5.5

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• 641: Removed aria-orientation role from root Group element as this was invalid according to the ARIA spec; (for more information see the discussion on issue #​640)
• 642: Bugfix: Fix collapsible Panel regression introduced in 4.5.3

v4.5.4

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• 638: Panel avoids unnecessary re-renders in response to mouse-hover state.

v4.5.3

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• 635: Expand pre-collapsed panels if drug past the halfway point for more consistent collapse/expand behavior.
• 631: Bugfix: Panels set max-width and max-height to 100% to fix potential CSS overflow bug.

v4.5.2

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• 626: Decrease default hit target size for Separator and Panel edges; make configurable via a new Group prop.

v4.5.1

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• 624: Bugfix: Fallback to alternate CSS cursor styles for Safari

Safari	Chrome, Firefox
grab	move
col-resize	ew-resize
row-resize	ns-resize

v4.5.0

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• 616: Replace Separator and Panel edge hit-area padding with a minimum size threshold based on Apple's user interface guidelines. Separators that are large enough will no longer be padded; separators that are too small (or panels without separators) will more or less function like before. This should not have much of a user-facing impact other than an increase in the click target area. (Previously I was not padding enough, as per Apple's guidelines.)
• 615, 620: Double-clicking on a Separator resets its associated Panel to its default-size (see video below); double-click will have no impact on panels without default sizes
• 622: Bugfix: Panels within vertical groups are now properly sized in Safari
• 618: Bugfix: Don't override adoptedStyleSheets

Demo of double-clicking on a separator:

dbl-click.mov

v4.4.2

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• 610: Fix calculated cursor style when "pointermove" event is has low-precision/rounded clientX and clientY values

v4.4.1

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• 600: Bugfix: Collapsible Panel should treat defaultSize={0} as collapsed on mount

v4.4.0

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• 599: Add new onLayoutChanged prop to Group.

For layout changes caused by pointer events, this method is not called until the pointer has been released. This callback should be used if you're doing something like saving a layout as it is called less frequently than the previous approach.

The useDefaultLayout hook has also been updated to use this callback (though it will continue to support the old callback as well, with a @deprecation tag).

v4.3.3

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• 595: Don't call event.preventDefault() on "pointerup" unless a handle was actively dragged

[!NOTE]
This change also fixes a text selection bug that impacted Windows users (#​574)

v4.3.2

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• Moved flex-grow Panel style to an inline value instead of a CSS variable defined on the parent Group to improve rendering performance. (This significantly reduces the negative impact from forced-reflow)

v4.3.1

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• 588: Replace "unset" styles with safer override values
• 589: Use capture phase for "pointerdown" and "pointerup" events; this is necessary for compatibility with certain UI libraries like Blueprint JS
• 590: Read Panel pixel size using offsetWidth/offsetHeight rather than inlineSize to avoid an edgecase bug with ResizeObserver

v4.3.0

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• 583: Group component now sets default width, height, and overflow styles; (both can be overridden using the style property)
• 582: Drag interactions only call event.preventDefault for the primary button
• Refine TS types for useGroupRef and usePanelRef to include | null to increase compatibility with older React versions
• Update TSDoc comments for Panel and Separator components

v4.2.2

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• useDefaultLayout hook initializes storage param to localStorage if undefined.
• Fix ambiguous type for Panel prop onResize that impacted certain TypeScript versions.

v4.2.1

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• 2a6b03f: Add displayName property to Group, Panel, and Separator components for better debugging experience.
• 577: Group handles newly registered Panels + Separators during mount so that user code can safely call imperative APIs earlier

v4.2.0

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• 573: Add prevPanelSize param to onResize callback to help simplify collapse/expand detection.

v4.1.1

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• 571: Update TS types to better reflect that Separator attributes role and tabIndex cannot be overridden using props.

v4.1.0

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• 567: useDefaultLayout hook supports saving and restoring multiple Panel layouts
• 568: Fix race in useGroupRef and usePanelRef hooks

v4.0.16

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• 563: Panel expand() API should restore pre-collapse size
• 564: Add guard for unexpected defaultView value seemingly returned by some dev environments

v4.0.15

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• 556: Ignore defaultLayout when keys don't match Panel ids

v4.0.14

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• 555: Allow resizable panels to be rendered into a different Window (e.g. popup or frame) by accessing globals through element.ownerDocument.defaultView

v4.0.13

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• useDefaultLayout: Deprecated groupId param in favor of id to avoid confusion; (there is no actual requirement for the Group to have a matching id)

v4.0.12

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• 552: useDefaultLayout now debounces calls to storage.setItem by 150ms

// To opt out of this change
useDefaultLayout({
  debounceSaveMs: 0,
  groupId: "test-group-id",
  storage: localStorage,
})

[!NOTE]
Some may consider this a breaking change, considering the default value is 150ms rather than 0ms. I think in practice this should only impact unit tests which can be easily fixed by overriding the default (as shown above) or by using fake timers.

Changes like this are often judgement calls, but I think on balance it's better to correct my initial oversight of not debouncing this by default.

v4.0.11

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• 8604491: Fix edge case bug with panel constraints not being properly invalidated after resize

v4.0.10

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• #​551: Expand fixed-size element support

v4.0.9

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• #​542: Clicks on higher z-index elements (e.g. modals) should not trigger separators behind them
• #​547: Don't re-mount Group when defaultLayout or disableCursor props change
• #​548: Bugfix: Gracefully handle Panel id changes
• #​549: Improve DevX when Group within hidden DOM subtree; defer layout-change events

v4.0.8

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• #​541: Don't set invalid layouts when Group is hidden or has a width/height of 0
• 40d4356: Gracefully handle invalid defaultLayout value

v4.0.7

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• f07bf00: Reset pointer-event styles after "pointerup" event

v4.0.6

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• 0796644: Account for Flex gap when calculating pointer-move delta %

v4.0.5

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• #​535: Updated docs to make size and layout formats clearer

v4.0.4

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• #​534: Set focus on Separator on "pointerdown"
• e08fe42: Improve iOS/Safari resize UX

v4.0.3

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• Fixed TS type for defaultLayout value returned from useDefaultLayout

v4.0.2

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• Export GroupImperativeHandle and PanelImperativeHandle types.

v4.0.1

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• useDefaultLayout: Deprecated groupId param in favor of id to avoid confusion; (there is no actual requirement for the Group to have a matching id)

v4.0.0

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Version 4 of react-resizable-panels offers more flexible size constraints– supporting units as pixels, percentages, REMs/EMs, and more. Support for server-rendering (including Server Components) has also been expanded.

Migrating from version 3 to 4

Refer to the docs for a complete list of props and API methods. Below are some examples of migrating from version 3 to 4, but first a couple of potential questions:

Q: Why'd you rename <component> or <prop>?

A: The most likely reason is that I think the new name more closely aligns with web standards like WAI-ARIA and CSS. For example, the PanelResizeHandle component was renamed to Separator to better align with the ARIA "separator" role and the direction prop was renamed to orientation to better align with the ARIA orientation attribute .

Q: Why'd you remove support for <feature>?

A: Probably because it wasn't used widely enough to justify the complexity required to maintain it. If it turns out that I'm mistaken, features can always be (re)added but it's more difficult to remove them.

Q: Were the onCollapse and onExpand event handlers removed?

A: Yes. Use the onResize event handler instead:

onResize={(size) => {
  // Either this
  const isCollapsed = size === collapsedSize;

  // Or this:
  panelRef.isCollapsed();
}}

Basic usage example

// Version 3

import { PanelGroup, Panel, PanelResizeHandle } from "react-resizable-panels";

<PanelGroup direction="horizontal">
  <Panel defaultSize={30} minSize={20}>left</Panel>
  <PanelResizeHandle />
  <Panel defaultSize={30} minSize={20}>right</Panel>
</PanelGroup>

// Version 4

import { Group, Panel, Separator } from "react-resizable-panels";

<Group orientation="horizontal">
  <Panel defaultSize="30%" minSize="20%">left</Panel>
  <Separator />
  <Panel defaultSize="30%" minSize="20%">right</Panel>
</Group>

Persistent layouts using localStorage

// Version 3

import { PanelGroup, Panel, PanelResizeHandle } from "react-resizable-panels";

<PanelGroup autoSaveId="unique-group-id" direction="horizontal">
  <Panel>left</Panel>
  <PanelResizeHandle />
  <Panel>right</Panel>
</PanelGroup>

// Version 4

import { Group, Panel, Separator, useDefaultLayout } from "react-resizable-panels";

const { defaultLayout, onLayoutChange } = useDefaultLayout({
  groupId: "unique-group-id",
  storage: localStorage
});

<Group defaultLayout={defaultLayout} onLayoutChange={onLayoutChange}>
  <Panel>left</Panel>
  <Separator />
  <Panel>right</Panel>
</Group>

[!NOTE]
Refer to the docs for examples of persistent layouts with server rendering and server components.

Conditional panels

// Version 3

import { PanelGroup, Panel, PanelResizeHandle } from "react-resizable-panels";

<PanelGroup autoSaveId="unique-group-id" direction="horizontal">
   {showLeftPanel && (
     <>
       <Panel id="left" order={1}>left</Panel>
       <PanelResizeHandle />
     </>
   )}
   <Panel id="center" order={2}>center</Panel>
   {showRightPanel && (
     <>
       <PanelResizeHandle />
       <Panel id="right" order={3}>right</Panel>
     </>
   )}
</PanelGroup>

// Version 4

import { Group, Panel, Separator } from "react-resizable-panels";

<Group>
  {showLeftPanel && (
    <>
      <Panel id="left">left</Panel>
      <Separator />
    </>
  )}
  <Panel id="center">center</Panel>
  {showRightPanel && (
    <>
      <Separator />
      <Panel id="right">right</Panel>
    </>
  )}
</Group>

Imperative APIs

// Version 3

import { PanelGroup, Panel, PanelResizeHandle } from "react-resizable-panels";
import type { ImperativePanelGroupHandle, ImperativePanelHandle }from "react-resizable-panels";

 const panelRef = useRef<ImperativePanelHandle>(null);
 const panelGroupRef = useRef<ImperativePanelGroupHandle>(null);

<PanelGroup direction="horizontal" ref={panelGroupRef}>
  <Panel ref={panelRef}>left</Panel>
  <PanelResizeHandle />
  <Panel>right</Panel>
</PanelGroup>

// Version 4

import { Group, Panel, Separator, useGroupRef, usePanelRef } from "react-resizable-panels";

const groupRef = useGroupRef();
const panelRef = usePanelRef();

<Group groupRef={groupRef} orientation="horizontal">
  <Panel panelRef={panelRef}>left</Panel>
  <Separator />
  <Panel>right</Panel>
</Group>

Disabling custom cursors

// Version 3

import { disableGlobalCursorStyles } from "react-resizable-panels";

disableGlobalCursorStyles();

// Version 4

import { Group, Panel, Separator } from "react-resizable-panels";

<Group disableCursor />

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Project	Deployment	Actions	Updated (UTC)
portal	Error		Jan 30, 2026 8:03am