chore(global-header): Global header optimization

[debsmita1]

Hey, I just made a Pull Request!

Resolves:
https://redhat.atlassian.net/browse/RHIDP-15555

Solution description:

• Cut NFS ./alpha Module Federation sync from ~972 KB → ~116 KB (~88%) by aligning with Backstage NFS patterns: thin alpha registration, heavy UI behind loaders/import().
• Default toolbar/menu extensions now use blueprint loaders; dropdowns use HeaderIcon ligatures instead of static @mui/icons-material on the sync path.
• Building blocks (GlobalHeaderIconButton / MenuItem / Dropdown) moved to a separate ./components export so they stay off /alpha sync and the path remains stable after alpha→stable graduation (MF forbids nested mounts like ./alpha/components).
• Lazy-load the AppBar shell in globalHeaderModule and config-driven HeaderIconButton so MUI is not on the alpha sync graph.
• Remaining ~116 KB is mostly Zod / frontend-plugin-api (framework tax).

Current expose summary

Metric	BEFORE	AFTER	Δ
Sync chunks	5	3	-2
Sync size	972 KB	117 KB	-855 KB (-88%)
Async chunks	198	241	+43
Async size	963 KB	~1968 KB	moved off sync

GIF:

Tested on RHDH with Quickstarts plugin

Screen.Recording.2026-07-27.at.10.44.05.PM.mov

Test setup:

Update the Quickstarts plugin

import { GlobalHeaderMenuItem } from '@red-hat-developer-hub/backstage-plugin-global-header/components';

2. Use blueprint loader — src/index.tsx:

const quickstartHelpMenuItem = GlobalHeaderMenuItemBlueprint.make({
  name: 'quickstart',
  params: {
    target: 'help',
    priority: 50,
    loader: async () => {
      const { QuickstartHelpMenuItem } = await import(
        './QuickstartHelpMenuItem'
      );
      return QuickstartHelpMenuItem;
    },
  },
});
(GlobalHeaderMenuItemBlueprint still comes from /alpha.)

3. Local portal (so TS + runtime see /components before publish)

In workspaces/quickstart:

File Dependency
package.json (resolutions) portal:../global-header/plugins/global-header
plugins/quickstart/package.json. portal:../../../global-header/plugins/global-header
packages/app/package.json. portal:../../../global-header/plugins/global-header

4. Build and export global-header and then quick start plugins into RHDH

npx @red-hat-developer-hub/cli plugin export --clean --dev \
  --dynamic-plugins-root <path-to>/rhdh/dynamic-plugins-root

5. check-out PR chore(app-next): add runnable RHDH NFS shell for local development rhdh#5115 and run the following commands:

EXPERIMENTAL_MODULE_FEDERATION=true yarn workspace app-next build
yarn workspace backend start:next 

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)

[rhdh-gh-app]

Important

This PR includes changes that affect public-facing API. Please ensure you are adding/updating documentation for new features or behavior.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
app	workspaces/global-header/packages/app	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-global-header	workspaces/global-header/plugins/global-header	minor	v2.0.0

[rhdh-qodo-merge]

PR Summary by Qodo

Optimize global-header federation sync via loaders and /components entry

✨ Enhancement 📝 Documentation ⚙️ Configuration changes 🕐 40+ Minutes

AI Description

• Add a new /components MF entry for building-block header UI exports.
• Prefer blueprint loader + lazy AppBar to keep MUI off /alpha sync.
• Replace sync MUI icons with HeaderIcon ligatures and fix menu item layout.

Diagram

graph TD
  A["Plugin consumer"] --> B["global-header /alpha"] --> C["Blueprints"] --> D["ExtensionBoundary.lazyComponent"] --> E["Async UI chunks"] --> F["MUI + Header UI"]
  B --> G["globalHeaderModule"] --> H["Lazy GlobalHeader"]

Loading

High-Level Assessment

The following are alternative approaches to this PR:

1. Split building blocks into a separate NPM package

• ➕ Hard boundary prevents accidental sync-graph bloat
• ➕ Avoids MF expose constraints entirely
• ➖ Extra package/versioning/release overhead
• ➖ More complicated dependency story for plugin authors

2. Keep exports in /alpha but rely on tree-shaking

• ➕ No breaking import-path change for consumers
• ➕ Less export surface/config churn
• ➖ Doesn't reliably reduce MF sync size (sync chunk often includes UI deps)
• ➖ Harder to enforce 'thin registration, heavy UI async' invariant

Recommendation: The PR’s approach (separate /components MF entry + loader-first blueprints + lazy AppBar shell) is the most reliable way to minimize the Module Federation sync graph given MF expose/mount constraints. The separate entry also preserves a stable import path for building blocks after alpha graduation.

Files changed (23) +550 / -269

Enhancement (10) +342 / -146

App.tsxSwitch sample header extension to loader-based /components import +21/-11

Switch sample header extension to loader-based /components import

• Updates the example menu item extension to use a blueprint 'loader' that dynamically imports 'GlobalHeaderMenuItem' from '/components'. Removes the eager '/alpha' building-block import to keep the app’s sync graph small.

workspaces/global-header/packages/app/src/App.tsx

components.tsCreate /components MF entry exporting building-block components +50/-0

Create /components MF entry exporting building-block components

• Adds a dedicated entry point that re-exports building-block components and types while default-exporting an empty 'createFrontendModule' so Backstage federates the entry. Documents why the path is '/components' (MF forbids nested mounts).

workspaces/global-header/plugins/global-header/src/alpha/components.ts

ApplicationLauncherDropdown.tsxReplace MUI icon imports with HeaderIcon ligatures +6/-6

Replace MUI icon imports with HeaderIcon ligatures

• Removes '@mui/icons-material' usage from the dropdown button and empty state. Uses 'HeaderIcon' and lightweight MUI 'Box' styling to keep icon code off the sync path.

workspaces/global-header/plugins/global-header/src/alpha/components/ApplicationLauncherDropdown.tsx

HelpDropdown.tsxSwap Help dropdown icons to HeaderIcon + Box wrapper +6/-4

Swap Help dropdown icons to HeaderIcon + Box wrapper

• Removes '@mui/icons-material' icons and replaces them with 'HeaderIcon' (ligatures) for both the toolbar button and the empty-state icon. Uses 'Box' to preserve sizing and disabled coloring.

workspaces/global-header/plugins/global-header/src/alpha/components/HelpDropdown.tsx

ProfileDropdown.tsxReplace profile dropdown icons with HeaderIcon +14/-6

Replace profile dropdown icons with HeaderIcon

• Removes MUI icon imports for account and chevron, replacing them with 'HeaderIcon' inside 'Box' wrappers. Preserves spacing and background styling while reducing sync-path icon dependencies.

workspaces/global-header/plugins/global-header/src/alpha/components/ProfileDropdown.tsx

menuItemExtensions.tsxLazy-load default dropdown menu items via blueprint loader +12/-9

Lazy-load default dropdown menu items via blueprint loader

• Converts default menu item extensions (profile/logout/support) from eager 'component' references to 'loader' functions with dynamic imports. Updates documentation comments to reflect loader/component behavior.

workspaces/global-header/plugins/global-header/src/alpha/defaults/menuItemExtensions.tsx

toolbarExtensions.tsxConvert default toolbar extensions to loader-first and data-driven tiers +63/-33

Convert default toolbar extensions to loader-first and data-driven tiers

• Replaces eager component imports with per-extension 'loader' functions for heavy UI (search, dropdowns, notifications, etc.). Converts the self-service button to data-driven params (title/icon/link) so the blueprint can lazy-load the shared button implementation.

workspaces/global-header/plugins/global-header/src/alpha/defaults/toolbarExtensions.tsx

blueprints.tsxAdd loader support and async data-driven component resolution +141/-65

Add loader support and async data-driven component resolution

• Extends toolbar and menu-item blueprint params with 'loader' and wraps implementations with 'ExtensionBoundary' for both lazy and sync components. Introduces an async data-driven loader so 'HeaderIconButton' and related MUI imports stay off the blueprint’s sync module graph.

workspaces/global-header/plugins/global-header/src/alpha/extensions/blueprints.tsx

globalHeaderModule.tsxLazy-load the GlobalHeader AppBar shell in the wrapper module +10/-3

Lazy-load the GlobalHeader AppBar shell in the wrapper module

• Removes the eager 'GlobalHeader' import and replaces it with 'React.lazy' + 'Suspense'. This keeps the AppBar/MUI-heavy shell out of the '/alpha' federation sync chunk.

workspaces/global-header/plugins/global-header/src/alpha/extensions/globalHeaderModule.tsx

readConfigComponents.tsxLazy-load config-driven HeaderIconButton rendering +19/-9

Lazy-load config-driven HeaderIconButton rendering

• Wraps config-driven header components in 'Suspense' and uses a lazy import for 'HeaderIconButton'. Keeps config-rendered UI from pulling MUI into the federation sync chunk.

workspaces/global-header/plugins/global-header/src/alpha/utils/readConfigComponents.tsx

Bug fix (6) +46 / -7

GlobalHeaderMenuItem.tsxFix menu item anchor layout to be full-width and consistent +9/-1

Fix menu item anchor layout to be full-width and consistent

• Expands the menu item link styling (padding/width/boxSizing/flex) to ensure consistent clickable area and layout across environments. Keeps visual styling aligned with other menu item wrappers.

workspaces/global-header/plugins/global-header/src/alpha/components/GlobalHeaderMenuItem.tsx

MyProfileMenuItem.tsxNormalize profile menu item link styling +9/-1

Normalize profile menu item link styling

• Updates the profile menu item’s link styling to match the new full-width/flex layout approach. Improves consistency with other menu items and surrounding wrappers.

workspaces/global-header/plugins/global-header/src/alpha/components/MyProfileMenuItem.tsx

MenuSection.tsxFix MenuSection menu item link wrapper styling and link props +10/-3

Fix MenuSection menu item link wrapper styling and link props

• Moves link wiring to a conditional spread to avoid always setting 'component/to'. Updates 'sx' to enforce full-width/flex layout and consistent padding across Backstage/RHDH styling differences.

workspaces/global-header/plugins/global-header/src/components/HeaderDropdownComponent/MenuSection.tsx

LogoutButton.tsxNormalize Logout button menu item layout to match other items +4/-0

Normalize Logout button menu item layout to match other items

• Adjusts padding/box model and layout styles so the logout row aligns with other menu items and fills the row width reliably. Helps maintain consistent clickable area and spacing.

workspaces/global-header/plugins/global-header/src/components/LogoutButton/LogoutButton.tsx

MenuItemLinkContent.tsxMove padding to menu item content for PatternFly compatibility +5/-1

Move padding to menu item content for PatternFly compatibility

• Replaces margin shorthand with 'my' and adds 'px' padding and 'boxSizing' at the content level. Documents why padding is applied to content (downstream styling zeroes padding on anchors/list items).

workspaces/global-header/plugins/global-header/src/components/MenuItemLink/MenuItemLinkContent.tsx

SupportButton.tsxUpdate Support button menu item styling for consistent row layout +9/-1

Update Support button menu item styling for consistent row layout

• Adjusts 'MenuItem' styling to match the new standard (padding, full width, flex layout, boxSizing). Ensures consistent appearance across help/profile dropdowns.

workspaces/global-header/plugins/global-header/src/components/SupportButton/SupportButton.tsx

Documentation (3) +76 / -44

components-entry-lazy-appbar.mdAdd changeset for /components entry and loader-first guidance +7/-0

Add changeset for /components entry and loader-first guidance

• Introduces a minor release note documenting the breaking import-path move for building blocks. Calls out the preferred pattern of dynamically importing components inside blueprint loaders and notes AppBar/MUI lazy-loading rationale.

workspaces/global-header/.changeset/components-entry-lazy-appbar.md

new-frontend-system.mdUpdate NFS docs to use loaders and /components building blocks +68/-43

Update NFS docs to use loaders and /components building blocks

• Rewrites examples to prefer 'loader' over 'component', dynamically importing building blocks from the new '/components' entry. Adds 'loader' to the parameter reference and clarifies which exports remain under '/alpha' versus '/components'.

workspaces/global-header/docs/new-frontend-system.md

README.mdDocument new /components import path for building-block UI +1/-1

Document new /components import path for building-block UI

• Clarifies that other plugins should import 'GlobalHeaderMenuItem'/'GlobalHeaderDropdown' from '/components' so they stay off the '/alpha' sync chunk. Keeps the existing pointer to the NFS documentation for full examples.

workspaces/global-header/plugins/global-header/README.md

Other (4) +86 / -72

package.jsonExport new ./components entry with typesVersions mapping +4/-0

Export new ./components entry with typesVersions mapping

• Adds a './components' export pointing at 'src/alpha/components.ts' and a corresponding 'typesVersions' entry. This enables consumers to import building blocks via '@.../components' with correct TS resolution.

workspaces/global-header/plugins/global-header/package.json

report-alpha.api.mdUpdate alpha API report for loader params and moved UI exports +2/-64

Update alpha API report for loader params and moved UI exports

• Removes building-block component exports from the '/alpha' report and adds 'loader' to toolbar/menu blueprint parameter types. Aligns the reported API surface with the new lazy-loading strategy.

workspaces/global-header/plugins/global-header/report-alpha.api.md

report-components.api.mdAdd API report for new /components entry +75/-0

Add API report for new /components entry

• Introduces a new API Extractor report describing the '/components' entry surface: 'GlobalHeaderIconButton', 'GlobalHeaderMenuItem', and 'GlobalHeaderDropdown' (and associated props).

workspaces/global-header/plugins/global-header/report-components.api.md

index.tsStop exporting building-block components from /alpha entry +5/-8

Stop exporting building-block components from /alpha entry

• Removes the building-block component re-exports from the '/alpha' barrel and replaces them with guidance comments pointing to '@.../components'. This enforces a smaller sync graph for the main federation entry.

workspaces/global-header/plugins/global-header/src/alpha/index.ts

[codecov]

Codecov Report

❌ Patch coverage is 40.59406% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.03%. Comparing base (fe4298b) to head (8a105fd).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4006      +/-   ##
==========================================
- Coverage   58.06%   58.03%   -0.03%     
==========================================
  Files        2411     2411              
  Lines       96367    96386      +19     
  Branches    26833    26828       -5     
==========================================
- Hits        55953    55940      -13     
- Misses      40218    40250      +32     
  Partials      196      196              

Flag	Coverage Δ		*Carryforward flag
adoption-insights	84.55% <ø> (ø)		Carriedforward from fe4298b
ai-integrations	69.71% <ø> (ø)		Carriedforward from fe4298b
app-defaults	69.79% <ø> (ø)		Carriedforward from fe4298b
augment	46.67% <ø> (ø)		Carriedforward from fe4298b
boost	76.77% <ø> (ø)		Carriedforward from fe4298b
bulk-import	72.56% <ø> (ø)		Carriedforward from fe4298b
cost-management	13.55% <ø> (ø)		Carriedforward from fe4298b
dcm	60.72% <ø> (ø)		Carriedforward from fe4298b
extensions	56.59% <ø> (ø)		Carriedforward from fe4298b
global-floating-action-button	71.18% <ø> (ø)		Carriedforward from fe4298b
global-header	64.41% <40.59%> (-2.09%)	⬇️
homepage	47.50% <ø> (ø)		Carriedforward from fe4298b
install-dynamic-plugins	59.95% <ø> (ø)		Carriedforward from fe4298b
intelligent-assistant	74.61% <ø> (ø)		Carriedforward from fe4298b
konflux	91.98% <ø> (ø)		Carriedforward from fe4298b
lightspeed	69.02% <ø> (ø)		Carriedforward from fe4298b
mcp-integrations	83.40% <ø> (ø)		Carriedforward from fe4298b
orchestrator	66.87% <ø> (ø)		Carriedforward from fe4298b
quickstart	63.74% <ø> (ø)		Carriedforward from fe4298b
sandbox	79.56% <ø> (ø)		Carriedforward from fe4298b
scorecard	85.45% <ø> (ø)		Carriedforward from fe4298b
theme	88.52% <ø> (ø)		Carriedforward from fe4298b
translations	5.12% <ø> (ø)		Carriedforward from fe4298b
x2a	79.20% <ø> (ø)		Carriedforward from fe4298b

*This pull request uses carry forward flags. Click here to find out more.

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[rhdh-qodo-merge]

Code Review by Qodo

🐞 Bugs (1) 📘 Rule violations (0) 🔗 Cross-repo conflicts (0) 📜 Skill insights (0)

Context used

⚠️ Tickets: not configured — ticket URL found in PR but could not be fetched — check ticket provider credentials

✅ Compliance rules (platform): 11 rules

✅ Cross-repo context

  ⚠️ Failed to retrieve: redhat-developer/rhdh

  Not relevant to this PR: redhat-developer/rhdh-chart

  Not relevant to this PR: redhat-developer/rhdh-operator

  Not relevant to this PR: redhat-developer/rhdh-local

1. trackValidity stuck on empty ✓ Resolved 🐞 Bug ≡ Correctness

Description

HelpDropdown uses trackValidity, but this PR changes the default help item to load via a
blueprint loader, meaning the dropdown can initially render with no [role="menuitem"] nodes.
GlobalHeaderDropdown then flips to emptyState (unmounting the menu content), so the dropdown can
remain empty for that open session even though items exist and would appear once loaded.

Code

workspaces/global-header/plugins/global-header/src/alpha/defaults/menuItemExtensions.tsx[R82-85]

+      loader: () =>
+        import('../../components/SupportButton/SupportButton').then(
+          m => m.SupportButton,
+        ),

Relevance

●●● Strong

Team often accepts fixes for transient empty-state/stale UI when async data loads into menus.

PR-#1804
PR-#3282

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

The Help dropdown explicitly enables trackValidity, and the support button menu item is now loaded
asynchronously via loader. GlobalHeaderDropdown computes showEmpty from `trackValidity &&
!hasVisibleItems and (when true) renders emptyState` instead of rendering
GlobalHeaderDropdownContent, while hasVisibleItems is only updated by a layout effect that
checks for [role="menuitem"] in the rendered MenuList—creating a timing window where async items
are not yet rendered and the dropdown flips to empty.

workspaces/global-header/plugins/global-header/src/alpha/components/HelpDropdown.tsx[29-51]
workspaces/global-header/plugins/global-header/src/alpha/defaults/menuItemExtensions.tsx[75-87]
workspaces/global-header/plugins/global-header/src/alpha/components/GlobalHeaderDropdown.tsx[71-113]
workspaces/global-header/plugins/global-header/src/alpha/extensions/blueprints.tsx[104-112]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

### Issue description
`GlobalHeaderDropdown`’s `trackValidity` logic can switch to `emptyState` before async-loaded menu items finish rendering. Once `emptyState` is shown, the menu content is unmounted, so lazy items may never mount/render for that open session.

### Issue Context
This PR converts the default Help dropdown’s `support-button` extension to use a blueprint `loader` (async component). `HelpDropdown` enables `trackValidity`, which relies on DOM presence of `[role="menuitem"]`.

### Fix Focus Areas
- workspaces/global-header/plugins/global-header/src/alpha/components/GlobalHeaderDropdown.tsx[75-113]
- workspaces/global-header/plugins/global-header/src/alpha/defaults/menuItemExtensions.tsx[75-87]
- workspaces/global-header/plugins/global-header/src/alpha/components/HelpDropdown.tsx[29-51]

### Suggested fix approach
1. Ensure the validity check re-runs after any render while the dropdown is open (e.g., remove the dependency array and guard with `if (!trackValidity || !isOpen) return;`), so it can recover when lazy items finally render.
2. Avoid unmounting the menu content solely due to `trackValidity` while items may still be loading. A robust pattern is:
  - Always render `GlobalHeaderDropdownContent` when `entries.length > 0`.
  - Conditionally *also* render `emptyState` (or overlay it) when no visible menu items are found, instead of replacing/unmounting the content.
3. Add a test case that opens Help dropdown with a lazy-loaded menu item and asserts it eventually renders (and does not get stuck on `emptyState`).

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

2. Lazy header lacks boundary 🐞 Bug ☼ Reliability

Description

The global header shell is now loaded via React.lazy and wrapped only in Suspense, so a rejected
dynamic import (e.g., missing/failed chunk) will error the header subtree instead of being contained
with a controlled fallback. This reduces resilience of a core navigation surface under real-world
chunk-load failures.

Code

workspaces/global-header/plugins/global-header/src/alpha/extensions/globalHeaderModule.tsx[R78-80]

+      <Suspense fallback={null}>
+        <LazyGlobalHeader />
+      </Suspense>

Relevance

●● Moderate

Resilience improvement is plausible, but adding an outer ErrorBoundary for lazy-import failures is
somewhat subjective.

PR-#3572
PR-#3296

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

globalHeaderModule now defines and renders LazyGlobalHeader via React.lazy with only a
Suspense wrapper. Meanwhile, the GlobalHeader component’s existing ErrorBoundary usage only
applies *after* the shell has successfully loaded and started rendering toolbar items, so it cannot
catch a lazy-import failure for the shell itself.

workspaces/global-header/plugins/global-header/src/alpha/extensions/globalHeaderModule.tsx[39-83]
workspaces/global-header/plugins/global-header/src/alpha/components/GlobalHeader.tsx[17-62]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

### Issue description
`LazyGlobalHeader` is rendered inside `Suspense` but not inside an `ErrorBoundary`. If the dynamic import rejects, React will throw an error (not a Suspense fallback), and without a local boundary the failure propagates to the nearest ancestor boundary (potentially taking out the header wrapper).

### Issue Context
The project already uses `@backstage/core-components` `ErrorBoundary` inside the `GlobalHeader` component for individual toolbar items, but the lazy-loaded *shell* itself is outside that protection.

### Fix Focus Areas
- workspaces/global-header/plugins/global-header/src/alpha/extensions/globalHeaderModule.tsx[39-83]
- workspaces/global-header/plugins/global-header/src/alpha/components/GlobalHeader.tsx[17-62]

### Suggested fix approach
Wrap the `<Suspense><LazyGlobalHeader/></Suspense>` block in `@backstage/core-components` `ErrorBoundary` (or use an equivalent Backstage boundary) with a small fallback that preserves layout (even if it’s `null`) and logs a useful error. This confines chunk-load failures to the header region and avoids breaking the wrapper subtree.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

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[ciiay]

The following files still importing GlobalHeaderMenuItem from /alpha. Let's also update them in this pr.

1. workspaces/quickstart/plugins/quickstart/src/QuickstartHelpMenuItem.tsx
2. workspaces/app-defaults/packages/app/src/modules/drawer-demo/DrawerDemoContent.tsx

[debsmita1]

The following files still importing GlobalHeaderMenuItem from /alpha. Let's also update them in this pr.

1. workspaces/quickstart/plugins/quickstart/src/QuickstartHelpMenuItem.tsx
2. workspaces/app-defaults/packages/app/src/modules/drawer-demo/DrawerDemoContent.tsx

These are different workspaces importing from the global-header package . I will update them once the new version of the global-header with these changes are released

[debsmita1]

Let's merge this one #3413 first

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud