fix(bundler): capture delayed compiled service spawn

[kwakayama]

Summary

• retain esbuild service interception through the first asynchronous operation in compiled Deno runtimes
• serialize concurrent initial transforms so the global spawn hook cannot nest
• cover concurrent initial transforms in the bundler suite

Validation

• deno fmt --check extensions/ext-bundler-esbuild/src/esbuild-bundler.ts extensions/ext-bundler-esbuild/src/esbuild-bundler.test.ts
• DENO_TESTING=1 VF_DISABLE_LRU_INTERVAL=1 NODE_ENV=production LOG_FORMAT=text deno test --no-check --allow-all extensions/ext-bundler-esbuild/src/esbuild-bundler.test.ts

Notes

The local compiled-binary test is blocked by the workstation Deno runtime missing complete node:util/types brand checks; CI runs the compiled-binary gate.

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when multiple bundling operations run concurrently.
  • Prevented esbuild service initialization conflicts and ensured failures are handled cleanly.
• Tests
  • Added coverage for concurrent bundling requests during service startup.

[github-actions]

📦 Client bundle boundary

Entrypoint	Modules	Source size	Server leaks
src/index.client.ts	454	3062 KiB	⚠️ 39 known

A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in scripts/lint/client-bundle-baseline.json to burn down.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7e0c32ae-b999-46b7-aa06-a0976319daca

📥 Commits

Reviewing files that changed from the base of the PR and between 5b688e8 and f25c08a.

📒 Files selected for processing (2)

• extensions/ext-bundler-esbuild/src/esbuild-bundler.test.ts
• extensions/ext-bundler-esbuild/src/esbuild-bundler.ts

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📝 Walkthrough

Walkthrough

The bundler now coordinates concurrent esbuild service initialization through shared capture state. It restores process interception across success and failure paths. A smoke test verifies that parallel transforms complete successfully.

Changes

Concurrent esbuild initialization

Layer / File(s)	Summary
Service capture coordination extensions/ext-bundler-esbuild/src/esbuild-bundler.ts	invokeEsbuild reuses live services, waits for active capture, tracks capture completion, restores spawn, and propagates operation errors.
Concurrent transform validation extensions/ext-bundler-esbuild/src/esbuild-bundler.test.ts	The test runs two TypeScript transforms concurrently, verifies both outputs, and stops the bundler during cleanup.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to f25c0

This PR localizes compiled-runtime service capture and concurrent transform handling in the bundler, with corresponding test coverage; no actionable merge-blocking risk remains at the current head.

Sequence Diagram(s)

sequenceDiagram
  participant TransformCall
  participant invokeEsbuild
  participant spawn
  participant EsbuildService
  TransformCall->>invokeEsbuild: request transform
  invokeEsbuild->>spawn: capture service creation
  spawn->>EsbuildService: start service
  EsbuildService-->>invokeEsbuild: provide live service
  invokeEsbuild->>EsbuildService: execute transform
  EsbuildService-->>TransformCall: return transformed output

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Possibly related PRs

• veryfront/veryfront-code#3537: Hardens concurrent esbuild initialization and adds related cross-runtime validation.

Suggested reviewers: kojiwakayama

🚥 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 summarizes the main change: fixing capture of delayed esbuild service spawning in the bundler.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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 fix/compiled-esbuild-service-capture

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_{Comment @coderabbitai help to get the list of available commands.}

[kwakayama]

Superseded by #3698, which identified and fixed the actual compiled-runtime root cause: ESBUILD_BINARY_PATH was first read inside the project environment scope. #3700’s delayed-spawn concurrency hypothesis was refuted by #3698’s compiled-binary coverage.