fix(image): discard stale async decode results

[joaner]

Description

Guard asynchronous image decode and bitmap-cache results with the worker runtime epoch. Results that finish after reset/dispose are closed and discarded instead of being rendered or cached.

Motivation / related issue

A JPEG, PNG, compressed-depth, or bitmap conversion started before a seek or topic switch can complete after the worker is reset. It could previously repaint or cache a stale frame.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing behavior to change)
• Documentation update
• Refactor / internal cleanup (no behavior change)

Checklist

• npm run lint passes with no errors
• npm test passes (649 tests)
• npm run build and npm run build:lib succeed
• New behavior is covered by tests
• Documentation updated (README, API.md, EMBEDDING.md) if the public API changed — N/A, no public API change
• Breaking change: all affected call sites updated and migration path described in PR description — N/A

Additional verification: npm run typecheck and Playwright H.264/compressed-depth image tests.

API compatibility

N/A

Screenshots / recordings

N/A — no visual UI change.

  

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	rosview	121c979	Commit Preview URL Branch Preview URL	Jul 26 2026, 02:33 PM