feat: [sidebar] add onPeekChange, fix inset peek background

[rohanchkrabrty]

Summary

• Give the peeking sidebar an opaque background. With variant="inset" the overlay was transparent and the page showed through it.
• Add onPeekChange(isPeeking) so a parent can react when a peek starts or ends, for example to dim the page.
• Document open and onOpenChange as the way to toggle the sidebar from outside <Sidebar>.
• Skip a built-in peek backdrop. onPeekChange covers it, and a fixed backdrop would escape the sidebar's container.
• The root transition already respects prefers-reduced-motion on main, so this PR does not change it.

Closes #875

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Project	Deployment	Actions	Updated
apsara	Ready	Preview	Oct 4, 2026 8:59pm UTC

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📚 Code guidelines (1)

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 162af236-a297-4765-8797-a5541d41495c

📥 Commits

Reviewing files that changed from the base of the PR and between e87bc03 and 2f9e0da.

📒 Files selected for processing (1)

• packages/raystack/components/sidebar/sidebar.module.css

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📝 Walkthrough

Walkthrough

The sidebar adds an optional onPeekChange callback that reports when peeking starts or ends. The documentation adds an external-control example and describes the callback. The sidebar also sets a base-primary background when it is peeking with the inset variant.

Suggested reviewers: ravisuhag

Priority: ➖ Normal

Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to 2f9e0

A parent using peek state to dim the page may retain that state if it removes the Sidebar mid-peek. This is a bounded lifecycle edge case; account for cleanup when using the callback for a backdrop.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 2f9e0

The change remains confined to sidebar behavior and styling, and existing callers remain compatible. The main uncertainty is lifecycle handling for parent effects driven by the new callback; no security-sensitive use was identified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated propagation is confined to sidebar rendering and optional parent UI reactions. Existing consumers can omit the callback. No tenant, service, data-store or environment exposure is established by the inspected paths; external consumers are outside the available coverage.

Trust Boundaries and Controls

• observed — The inspected flow is pointer interaction to internal React state to a boolean callback within the consuming UI. Controlled open state remains separate from transient peeking, and the notification introduces no authorization or credential boundary in this component.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	Issue #875’s inset-peek background is implemented in sidebar.module.css. onPeekChange is implemented and tested, and the docs show external control with open and onOpenChange. The Sidebar widt…	Implement an optional peek backdrop for peekOnHover and tie its visibility to the peek state, as requested in #875.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the two main changes: adding the onPeekChange callback and fixing the inset peek background.
Description check	✅ Passed	The description explains the Sidebar changes, external control documentation, and decisions about the backdrop and reduced-motion behavior.
Out of Scope Changes check	✅ Passed	The diff changes Sidebar styling, peek-state API and test coverage, and Sidebar documentation. These changes all support the objectives in #875. No unrelated change is evident.

Full details: Linked Issues check

Explanation

Issue #875’s inset-peek background is implemented in sidebar.module.css. onPeekChange is implemented and tested, and the docs show external control with open and onOpenChange. The Sidebar width and margin transitions are already inside @media (prefers-reduced-motion: no-preference) at the reviewed head. The issue-requested optional peek backdrop is not implemented; the callback lets consumers build one but does not provide the requested built-in option.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files. (1 skipped: 1 unsupported.)

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commit: 2f9e0da

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/raystack/components/sidebar/sidebar-root.tsx:
- Around line 193-198: Update the peek-state reporting effect in SidebarRoot to
notify onPeekChange with false when the component unmounts while isPeeking is
true. Preserve the existing change notifications and avoid sending a duplicate
inactive notification.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: f5b40857-f473-43c1-81d7-33c667dd37e6

📥 Commits

Reviewing files that changed from the base of the PR and between d088032 and e87bc03.

📒 Files selected for processing (5)

• apps/www/src/content/docs/components/sidebar/index.mdx
• apps/www/src/content/docs/components/sidebar/props.ts
• packages/raystack/components/sidebar/__tests__/sidebar.test.tsx
• packages/raystack/components/sidebar/sidebar-root.tsx
• packages/raystack/components/sidebar/sidebar.module.css

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