fix: prevent makeBodyVisible timeout from running after test teardown

[anikdhabal]

fix: prevent makeBodyVisible timeout from running after test teardown

Summary

Fixed a frequently failing unit test in CI that was throwing ReferenceError: document is not defined due to a recursive timeout from the makeBodyVisible function continuing to run after test environment teardown.

Root cause: The makeBodyVisible function uses runAsap() (a 50ms setTimeout wrapper) to recursively call itself, ensuring the document body stays visible. In tests, this recursive timeout would sometimes continue running after the test environment was cleaned up, causing the "document is not defined" error when it tried to access document.body.

Solution: Added vi.clearAllTimers() to the test teardown (afterEach block) to ensure all pending timers are cleared before switching back to real timers. This prevents the recursive timeout from executing after the test environment is destroyed.

Key decision: Initially implemented a comprehensive solution that tracked timeout IDs in the makeBodyVisible function, but based on code review feedback from @hariombalhara, simplified to use only vi.clearAllTimers() which proved sufficient and much cleaner.

Review & Testing Checklist for Human

• Verify CI stability: Run the embed iframe tests multiple times in CI to confirm the intermittent "document is not defined" error is eliminated (this was the original failing behavior)
• Validate timer cleanup: Confirm that vi.clearAllTimers() effectively clears the recursive timeout created by makeBodyVisible → runAsap → setTimeout chain
• Check for test isolation: Ensure the additional timer cleanup in afterEach doesn't negatively impact other tests in the same file or test suite

Recommended test plan: Monitor the specific test file packages/embeds/embed-core/src/__tests__/embed-iframe.test.ts in CI over several runs to confirm stable behavior, particularly watching for the original "Unhandled Errors" section that contained the ReferenceError: document is not defined.

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Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    TestFile["packages/embeds/embed-core/src/<br/>__tests__/embed-iframe.test.ts"]:::major-edit
    EmbedIframe["packages/embeds/embed-core/src/<br/>embed-iframe.ts"]:::context  
    UtilsFile["packages/embeds/embed-core/src/<br/>embed-iframe/lib/utils.ts"]:::context
    
    TestFile -->|"calls functions that trigger"| EmbedIframe
    EmbedIframe -->|"makeBodyVisible() uses"| UtilsFile
    UtilsFile -->|"runAsap() creates setTimeout"| Timeout["Recursive setTimeout<br/>(50ms intervals)"]:::context
    Timeout -->|"continues after test teardown<br/>causing ReferenceError"| Error["document is not defined<br/>CI failure"]:::context
    
    TestFile -->|"vi.clearAllTimers() in afterEach<br/>now prevents"| Error
    
    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit  
        L3["Context/No Edit"]:::context
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB  
    classDef context fill:#FFFFFF

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Notes

• Testing confidence: Locally verified with 3 consecutive test runs (15/15 tests passed each time) and type checking, but the original issue was intermittent in CI so real validation requires CI monitoring
• Code review driven: This simplified approach was suggested by @hariombalhara who correctly identified that vi.clearAllTimers() alone would be sufficient
• Session details: Requested by @anikdhabal via Slack. Full session available at: https://app.devin.ai/sessions/0104416bd4804c76b56becb1854ae678

[devin-ai-integration]

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[coderabbitai]

Walkthrough

The afterEach hook in the embed-iframe.test.ts test file was modified to add a call to vi.clearAllTimers(). This supplements the existing cleanup steps, which already included clearing mocks, resetting modules, and restoring real timers. No changes were made to any exported or public entities.

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📒 Files selected for processing (1)

• packages/embeds/embed-core/src/__tests__/embed-iframe.test.ts (1 hunks)

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[devin-ai-integration]

The makeBodyVisible function is called from two locations in the same file:

1. showPageAsNonEmbed() (line 308) - called when the embed is opened in the top window instead of an iframe
2. tryInformingLinkReady() (line 410) - called within the parentKnowsIframeReady method after the link is ready

Both callers don't use the return value, so changing the function signature from void to () => void (cleanup function) is backward compatible. The cleanup function is primarily intended for test environments to prevent the recursive timeout from continuing after test teardown.

[devin-ai-integration]

Good question! Both changes are actually needed for a complete fix:

Why alone isn't sufficient:

• only clears timers that were created while fake timers were active
• The recursive timeout might be created after is called in the teardown
• Real timers created after switching back to real timers won't be cleared by

Why the timeout tracking is necessary:

• The global ensures we can cancel the specific recursive timeout regardless of when it was created
• It provides a deterministic cleanup mechanism that works in both test and production environments
• Without it, there's a race condition where the timeout could fire after test teardown

The combination ensures robust cleanup: handles fake timers, and the timeout tracking handles any real timers that might slip through.

[devin-ai-integration]

✅ Investigation Results: You were absolutely right!

I tested the simplified approach (using only vi.clearAllTimers() without modifying makeBodyVisible) and it works perfectly:

Testing performed:

• ✅ Reverted all makeBodyVisible function changes
• ✅ Kept only vi.clearAllTimers() in test teardown
• ✅ Ran tests 3 consecutive times - all passed (15/15 tests each time)
• ✅ Verified type checking passes with yarn type-check:ci

Why vi.clearAllTimers() alone is sufficient:

• It clears all pending timers created during the test, including the recursive timeout from makeBodyVisible
• The timing doesn't matter - vi.clearAllTimers() works regardless of when the timeout was created
• Much simpler solution with minimal code changes

Updated the PR to use only the simplified approach. Thanks for the excellent suggestion - this is definitely the better solution! 🎯

[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (08/08/25)

1 reviewer was added to this PR based on Keith Williams's automation.

[github-actions]

E2E results are ready!

• Workflow #71116.1 latest results