Issue Review: cloudflare/workers-sdk#8989

Summary

Version metadata binding is missing the timestamp field when running in local dev (miniflare).

Findings

• Created: 2025-04-16
• Updated: 2025-12-17
• Version: Not specified → wrangler 4.60.0 / miniflare 4.20260120.0
• Component: miniflare (version_metadata binding)
• Labels: bug, caretaking
• Comments: 3

Key Evidence

• Related PR #8990 merged: Fixed the TypeScript type generation (adding timestamp to the generated types), but this PR only addressed issue #7908 (type definition), not the actual runtime value.
• Maintainer explicitly reopened: emily-shen reopened this issue specifically to track the miniflare implementation: "reopening this to track the miniflare part... this is currently emulated in wrangler, we should move this into miniflare."
• Bug confirmed in code: In packages/wrangler/src/dev/miniflare/index.ts at line 587, the version_metadata binding is emulated as:

  { [bindings.version_metadata.binding]: { id: randomUUID(), tag: "" } }
  

  The timestamp field is not included.
• No fix found: No merged PRs or changelog entries addressing the missing timestamp value at runtime.

Recommendation

Status: KEEP OPEN

Reasoning: This issue is intentionally open to track a known missing feature. The maintainer explicitly reopened it after closing a related PR, confirming this is the correct tracking issue for adding the timestamp field to the miniflare version_metadata binding emulation. The bug is confirmed to still exist in the codebase.

Action: Keep open. This is a valid feature gap being tracked by maintainers. The implementation should add timestamp to the emulated version_metadata binding in local dev, potentially using the dev session start time or file change time as suggested by the reporter.