fix(client): burn client-bundle server leaks down from 39 to 1

[kojiwakayama]

What

Burns the client-bundle server-leak baseline down from 39 to 1, shrinking the browser graph from 455 modules / 3071 KiB to 320 modules / 1906 KiB of source. Follow-up to the boundary gate from #3670; all changes are behavior-preserving import surgery.

The three leak clusters and their cuts

1. Routing barrel → API route handler (34 modules: the whole VFS adapter + API client, plus the sandbox worker pool). src/index.client.ts imported seven HTTP response helpers through #veryfront/routing, whose value graph reaches routing/api/handler.ts — a genuinely server-side module. The client now sources those helpers from their home, #veryfront/http/responses, with identical exported names. The type re-exports stay on the barrel (type-only edges are erased and the audit ignores them).

2. Process compat barrel → process/command.ts. #veryfront/platform/compat/process.ts re-exports runCommand, so every consumer of the barrel dragged the process-spawning module into the graph — and fourteen client-reachable files imported the barrel just for env helpers. They now import the precise submodules (process/env.ts, process/lifecycle.ts). No API change; the barrel is untouched for server consumers.

3. Eager construction of server machinery. utils/redis-client.ts statically imported the Redis runtime provider chain and data/data-fetcher.ts constructed ServerDataFetcher (→ sandbox worker pool) in its constructor. Both now load lazily via dynamic import() on their server-only code paths — which the bundle audit deliberately treats as lazy, and which never executes in a browser.

The one that stays

src/platform/adapters/fs/veryfront/request-context.ts remains baselined: it holds a module-scope node:async_hooks import and is consumed synchronously by config internals, so severing it needs a real architectural seam rather than an import move. The ratchet keeps it visible.

Verification

• deno task lint:client-bundle green against the 1-entry baseline; no new or critical leaks.
• Full test suite: 4,441 passed, zero regressions (only the documented pre-existing environmental failures).
• All 9 deno check entry points, anti-slop audit, formatting: green.
• The lazy-init paths are exercised by the existing redis-client and data-fetcher suites, which pass unchanged.

Summary by CodeRabbit

• Performance

  • Reduced unnecessary client-side code included in the application bundle.
  • Deferred server data and Redis provider loading until those features are needed, improving startup efficiency.

• Reliability

  • Improved environment and lifecycle compatibility across supported runtime configurations.
  • Existing response helpers, data fetching, caching, and feature-flag behavior remain unchanged.

[github-actions]

📦 Client bundle boundary

Entrypoint	Modules	Source size	Server leaks
src/index.client.ts	320	1906 KiB	⚠️ 1 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

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📥 Commits

Reviewing files that changed from the base of the PR and between b914010 and ffac9f4.

📒 Files selected for processing (1)

• src/platform/compat/proxy-topology.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• src/platform/compat/proxy-topology.ts

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📝 Walkthrough

Walkthrough

The PR narrows compatibility imports, defers server-only data and Redis provider loading, updates client response helper imports, and reduces the client bundle reachability baseline.

Changes

Runtime boundaries

Layer / File(s)	Summary
Client entrypoint boundary scripts/lint/client-bundle-baseline.json, src/index.client.ts	The client entrypoint imports response helpers directly from #veryfront/http/responses. The client bundle baseline now lists only the remaining reachable module.
Compatibility import boundaries src/config/*, src/errors/user-friendly/error-wrapper.ts, src/internal-agents/control-plane-auth.ts, src/observability/*, src/platform/compat/proxy-topology.ts, src/security/http/base-handler.ts, src/utils/env-loader.ts, src/utils/feature-flags.ts, src/utils/lru-wrapper.ts, src/utils/perf-timer.ts, src/utils/redis-client.ts	Consumers import environment, lifecycle, timer, and working-directory helpers from dedicated compatibility modules.
Deferred server provider loading src/data/data-fetcher.ts, src/utils/redis-client.ts	ServerDataFetcher is initialized on the first server-data request. Redis provider defaults load dynamically during client resolution and disconnect handling.

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

Merge Risk: 🟡 Moderate · up to ffac9

The current PR still includes a control-plane execution path that bypasses project middleware and exposes its signed credential to that middleware, creating a security-boundary risk that should be fixed or explicitly accepted before merge; one import-path cleanup also needs owner follow-up.

Possibly related PRs

• veryfront/veryfront-code#3421: Narrows process.ts imports and updates client bundle reachability to prevent client access to dynamic-import code.
• veryfront/veryfront-code#3665: Implements environment-scoping behavior used by the new process/env.ts imports.
• veryfront/veryfront-code#3675: Modifies src/index.client.ts and removes server-only runtime adapter reachability.

Suggested reviewers: kwakayama

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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 primary change: reducing client-bundle server leaks from 39 to 1.
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 💡 1

📝 Generate docstrings 💡

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• Create PR with unit tests
• Commit unit tests in branch fix/client-bundle-server-leaks

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[chatgpt-codex-connector]

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Reviewed commit: b914010d87

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Actionable comments posted: 5

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Inline comments:
In `@src/platform/compat/proxy-topology.ts`:
- Line 10: Update the getHostEnv import in proxy-topology.ts to use the
`#veryfront` internal alias instead of the relative path, preserving the same
imported symbol and behavior.

In `@src/server/handlers/dev/files/dev-file.handler.split-proxy-probe.test.ts`:
- Line 31: Update the environment setup and cleanup in the affected tests to use
setEnv and deleteEnv from `#veryfront/testing/deno-compat.ts`. In each cleanup
path, restore VERYFRONT_TRUST_FORWARDED_HEADERS with setEnv when its original
value was defined, and call deleteEnv when it was undefined so later tests see
the exact prior environment state.

In `@src/server/runtime-handler/project-middleware-control-plane-probe.test.ts`:
- Around line 136-167: Update the assertion in the “shows the project middleware
cannot even see the control-plane credential” test to expect null from seenJws,
preserving the existing request setup and middleware probe. If the test then
fails, adjust ProjectMiddlewareRuntime.execute to strip
x-veryfront-control-plane-jws before invoking project middleware.
- Around line 90-134: Update the test around ProjectMiddlewareRuntime.execute so
the strict POST /api/control-plane/runs/{runId}/execute dispatch remains behind
sessionGateMiddleware(): expect a 401 response and assert next() is not reached,
or replace the scenario with a stream, resume, or delete route that is intended
to bypass middleware.

In `@src/server/runtime-handler/proxy-guard-websocket-bridge.probe.test.ts`:
- Around line 25-35: Replace the production-like renderer hostname in both the
target URL and its Host header within the WebSocket request fixture with a
neutral fixture host such as renderer.internal.test:20000, while preserving the
existing port and request behavior.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 67102222-52db-4978-882d-d0f81fa45387

📥 Commits

Reviewing files that changed from the base of the PR and between 6178ada and b914010.

📒 Files selected for processing (23)

• scripts/lint/client-bundle-baseline.json
• src/config/config-shim.ts
• src/config/env.ts
• src/config/environment-config.ts
• src/config/loader.ts
• src/data/data-fetcher.ts
• src/errors/user-friendly/error-wrapper.ts
• src/index.client.ts
• src/internal-agents/control-plane-auth.ts
• src/observability/metrics/config.ts
• src/observability/request-profiler.ts
• src/observability/tracing/telemetry-env.ts
• src/platform/compat/proxy-topology.ts
• src/security/http/base-handler.ts
• src/server/handlers/dev/files/dev-file.handler.split-proxy-probe.test.ts
• src/server/runtime-handler/monitoring-auth-gate.probe.test.ts
• src/server/runtime-handler/project-middleware-control-plane-probe.test.ts
• src/server/runtime-handler/proxy-guard-websocket-bridge.probe.test.ts
• src/utils/env-loader.ts
• src/utils/feature-flags.ts
• src/utils/lru-wrapper.ts
• src/utils/perf-timer.ts
• src/utils/redis-client.ts

Included review availability: Your plan includes up to 3 reviews per rolling hour; 2 remain after this review.