fix(router-core): useBlocker navigation issues for 404 pages and external URLs

[jiji-hoon96]

Summary

Fixes two critical navigation issues with the useBlocker hook:

1. 404 Page Navigation: Previously, when a user was on a 404 page with an active blocker, attempting to navigate to any other page would throw an error: "Error: No route found for location /foo"

2. External URL ignoreBlocker: The ignoreBlocker option was not respected for external URLs, causing blockers to still prevent navigation even when explicitly ignored

Changes

404 Page Navigation Fix

• Modified getLocation function in useBlocker.tsx to handle 404 routes gracefully
• Added special handling for routes where foundRoute is undefined by returning routeId: '__notFound__'
• Implemented logic to allow navigation from 404 pages to valid routes without blocking

External URL ignoreBlocker Fix

• Modified navigate function in router.ts to respect ignoreBlocker option for external URLs
• Added manual blocker checking for external URLs when ignoreBlocker is false
• Made navigate function async to properly handle blocker promises

Test Coverage

• Added comprehensive tests to verify both 404 page navigation and external URL behavior
• Verified all existing tests pass (661 tests) to ensure no regressions

Technical Details

404 Page Navigation

1. Root Cause: The blocker was trying to resolve 404 paths as valid routes, causing errors when getMatchedRoutes returned undefined for foundRoute.

2. Solution: The getLocation function now:

   • Returns a special location object with routeId: '__notFound__' for unmatched routes
   • Allows navigation from 404 pages to valid routes by checking route IDs
   • Maintains normal blocking behavior for valid-to-valid route navigation

External URL ignoreBlocker

1. Root Cause: External URL navigation bypassed the normal blocker flow and didn't check the ignoreBlocker option.

2. Solution: The navigate function now:

   • Checks blockers manually for external URLs unless ignoreBlocker: true
   • Iterates through all registered blockers and awaits their blockerFn
   • Cancels navigation if any blocker returns true, proceeds if all allow
   • Preserves existing behavior for internal URLs

Breaking Changes

None. All existing functionality is preserved and the API remains unchanged.

Fixes

• useBlocker breaks navigation on 404 page #4881 (404 page navigation issue)
• "ignoreBlocker" is ignored when navigating to external url #4844 (ignoreBlocker)
• beforeunload dialog triggered by redirect to external site even after original blocker proceed occurs #4094 (I think it's a similar issue.)

[nx-cloud]

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---

☁️ Nx Cloud last updated this comment at 2025-08-11 12:34:06 UTC

[pkg-pr-new]

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commit: 4ddec20