Issue Review: cloudflare/workers-sdk#7934

Summary

Custom build command runs twice when first starting wrangler dev.

Findings

• Created: 2025-01-28
• Updated: 2025-11-26
• Version: wrangler 3.103.2 → wrangler 4.61.0
• Component: wrangler (dev)
• Labels: bug
• Comments: 7

Key Evidence

• Reproduction repo: https://github.com/pydantic/pydantic.run
• Build runs once initially, then immediately detects change and rebuilds
• Message shows: "The file src/frontend/src,src/cf_worker/src changed, restarting build..."
• PR #7423 was opened to fix this but the "Fix logging" commit reverted the actual fix
• User @treeder (Nov 2025) reports issue still exists and "feels like a 10 minute fix"
• Affects developers with long build times (e.g., Rust/WASM builds fail due to concurrent wasm-opt)

Recommendation

Status: KEEP OPEN

Reasoning: This is a confirmed bug affecting developer experience. PR #7423 exists but its fix was accidentally reverted. Recent comments confirm the issue persists in current versions.

Action: Review PR #7423 and properly implement the fix that was reverted in the "Fix logging" commit.

Suggested Comment

N/A - Issue has PR #7423 that needs review.