fix: align getAccessTokenSilently return type with auth0-spa-js

[gyaneshgouraw]

Summary

Bumps @auth0/auth0-spa-js to ^2.26.0 and updates sdk types to match the latest getTokenSilently return type.

Upstream PR auth0/auth0-spa-js#1733 updated getTokenSilently to include undefined in its return type.
There is no functional change in this PR.

Changes

• Bump @auth0/auth0-spa-js to ^2.26.0.
• Update getAccessTokenSilently to return Observable<string | GetTokenSilentlyVerboseResponse | undefined> to match the upstream signature.
• Update the interceptor's token-mapping callback to handle the widened type. The existing missing_token guard already handles undefined, so runtime behaviour remains unchanged.

Testing

• Ran npm run test — all tests pass.
• Type-check passes with the updated return type.

Summary by CodeRabbit

• Updates

  • Improved compatibility with the latest authentication library behavior.

• Bug Fixes

  • Improved handling of access-token requests that return no token, while continuing to report missing-token errors when appropriate.
  • Updated token retrieval behavior to accurately reflect that cache-only requests may return no value.

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Reviewing files that changed from the base of the PR and between bf74d92 and 68803d3.

📒 Files selected for processing (1)

• projects/auth0-angular/src/lib/auth.service.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• projects/auth0-angular/src/lib/auth.service.ts

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📝 Walkthrough

Walkthrough

The PR updates @auth0/auth0-spa-js to ^2.26.0 and widens silent token result types to include undefined. The interceptor retains missing-token errors and token extraction. One function is reformatted without behavior changes.

Changes

Token dependency and typing update

Layer / File(s)	Summary
Dependency and token contract package.json, projects/auth0-angular/package.json, projects/auth0-angular/src/lib/auth.service.ts, projects/auth0-angular/src/lib/auth.interceptor.ts	Both package manifests use @auth0/auth0-spa-js ^2.26.0. AuthService.getAccessTokenSilently and the interceptor accept possibly undefined results. The interceptor still throws missing_token when no token is returned and extracts string or verbose-response tokens. The updateAuthenticationMethod function is reformatted without behavior changes.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 68803

The updated token contract retains the existing missing-token behavior, including anonymous requests proceeding without an Authorization header. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: aligning the getAccessTokenSilently return type with the updated auth0-spa-js API.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/spa-js-2.26.0

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

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Inline comments:
In `@projects/auth0-angular/src/lib/auth.service.ts`:
- Line 293: Update both public getTokenSilently overloads in AuthService to
include undefined in their Observable return types, covering both the
string-token and verbose-response overloads while preserving their existing
signatures and option handling.

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Fix all unresolved CodeRabbit comments on this PR:

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📒 Files selected for processing (4)

• package.json
• projects/auth0-angular/package.json
• projects/auth0-angular/src/lib/auth.interceptor.ts
• projects/auth0-angular/src/lib/auth.service.ts

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