Optimize `processImportSpecifier` by computing `shouldFollowImportsFromFile` once per file by Copilot · Pull Request #3052 · vercel/workflow

Copilot · 2026-07-22T15:15:29Z

Description

processImportSpecifier was calling shouldFollowImportsFromFile(filePath, forceFollowImports) once for every import specifier in a file, even though the result only depends on filePath and forceFollowImports. Hoist that evaluation into processFile and pass the boolean result down:

processFile now computes shouldFollow once before iterating specifiers.
processImportSpecifier now accepts a shouldFollow: boolean argument instead of forceFollowImports: boolean.

// BeforeawaitPromise.all(specifiers.map((specifier)=>processImportSpecifier(filePath,specifier,forceFollowImports)));// AfterconstshouldFollow=awaitshouldFollowImportsFromFile(filePath,forceFollowImports);// ...awaitPromise.all(specifiers.map((specifier)=>processImportSpecifier(filePath,specifier,shouldFollow)));

How did you test your changes?

Ran the @workflow/builders test suite (fast-discovery.test.ts and related files pass).
Verified the change with Biome lint/format on the modified file.

PR Checklist - Required to merge

📦 pnpm changeset was run to create a changelog for this PR
- Use the correct semver bump type: patch for bug fixes, minor for new features, major for breaking changes.
- Use pnpm changeset --empty if you are changing documentation or workbench apps
🔒 DCO sign-off passes (run git commit --signoff on your commits)
📝 Ping @vercel/workflow in a comment once the PR is ready, and above checklist is complete

…le check

vercel · 2026-07-22T15:15:37Z

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Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Jul 23, 2026 10:49pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Jul 23, 2026 10:49pm
example-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
workbench-astro-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
workbench-express-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
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workbench-nitro-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
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workbench-sveltekit-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
workbench-tanstack-start-workflow	Ready	Preview, Comment	Jul 23, 2026 10:49pm
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workflow-web	Ready	Preview, Comment	Jul 23, 2026 10:49pm

changeset-bot · 2026-07-22T15:15:42Z

🦋 Changeset detected

Latest commit: 10fad5b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@workflow/builders	Patch
@workflow/astro	Patch
@workflow/cli	Patch
@workflow/nest	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/nuxt	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
@workflow/vitest	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/core	Patch
@workflow/web-shared	Patch
@workflow/web	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

github-actions · 2026-07-22T15:16:31Z

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Skipped	Total
✅ ▲ Vercel Production	1455	239	1694
✅ 💻 Local Development	1621	227	1848
✅ 📦 Local Production	1621	227	1848
✅ 🐘 Local Postgres	1621	227	1848
✅ 🪟 Windows	154	0	154
✅ 📋 Other	1020	212	1232
✅ vercel-multi-region	27	0	27
Total	7519	1132	8651

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro	126	28
✅ example	126	28
✅ express	126	28
✅ fastify	126	28
✅ hono	126	28
✅ nextjs-turbopack	151	3
✅ nextjs-webpack	151	3
✅ nitro	126	28
✅ nuxt	126	28
✅ sveltekit	145	9
✅ vite	126	28

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	128	26
✅ express-stable	128	26
✅ fastify-stable	128	26
✅ hono-stable	128	26
✅ nextjs-turbopack-canary	135	19
✅ nextjs-turbopack-stable	154	0
✅ nextjs-webpack-canary	135	19
✅ nextjs-webpack-stable	154	0
✅ nitro-stable	128	26
✅ nuxt-stable	128	26
✅ sveltekit-stable	147	7
✅ vite-stable	128	26

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	128	26
✅ express-stable	128	26
✅ fastify-stable	128	26
✅ hono-stable	128	26
✅ nextjs-turbopack-canary	135	19
✅ nextjs-turbopack-stable	154	0
✅ nextjs-webpack-canary	135	19
✅ nextjs-webpack-stable	154	0
✅ nitro-stable	128	26
✅ nuxt-stable	128	26
✅ sveltekit-stable	147	7
✅ vite-stable	128	26

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	128	26
✅ express-stable	128	26
✅ fastify-stable	128	26
✅ hono-stable	128	26
✅ nextjs-turbopack-canary	135	19
✅ nextjs-turbopack-stable	154	0
✅ nextjs-webpack-canary	135	19
✅ nextjs-webpack-stable	154	0
✅ nitro-stable	128	26
✅ nuxt-stable	128	26
✅ sveltekit-stable	147	7
✅ vite-stable	128	26

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	154	0	0

✅ 📋 Other

App	Passed	Skipped
✅ e2e-local-dev-nest-stable	128	26
✅ e2e-local-dev-tanstack-start-	128	26
✅ e2e-local-postgres-nest-stable	128	26
✅ e2e-local-postgres-tanstack-start-	128	26
✅ e2e-local-prod-nest-stable	128	26
✅ e2e-local-prod-tanstack-start-	128	26
✅ e2e-vercel-prod-nest	126	28
✅ e2e-vercel-prod-tanstack-start	126	28

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

📋 View full workflow run

github-actions · 2026-07-22T15:16:31Z

📊 Workflow Benchmarks

commit 10fad5b · Thu, 23 Jul 2026 23:01:48 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1319 (+32%) 🔻	1415 🔴 (+29%) 🔻	1497 🔴 (+34%) 🔻	1866 🔴 (+10%)	30
TTFS	stream	412 (+9.0%)	1408 🔴 (+28%) 🔻	1482 🔴 (+31%) 🔻	1587 🔴 (+25%) 🔻	30
TTFS	hook + stream	1470 (+166%) 🔻	1728 🔴 (+23%) 🔻	1781 🔴 (+21%) 🔻	1897 🔴 (+28%) 🔻	30
STSO	1020 steps (1-20)	185 (+1.1%)	294 🔴 (+6.9%)	305 🔴 (+4.8%)	331 🔴 (±0%)	19
STSO	1020 steps (101-120)	198 (+3.1%)	322 🔴 (+1.6%)	567 🔴 (+21%) 🔻	2199 🔴 (+248%) 🔻	19
STSO	1020 steps (1001-1020)	483 (-4.2%)	573 🔴 (-4.0%)	599 🔴 (-9.1%)	816 🔴 (+12%)	19
WO	1020 steps	403452 (-3.3%)	403452 (-3.3%)	403452 (-3.3%)	403452 (-3.3%)	1
SL	stream latency	107 (+2.9%)	157 🔴 (-0.6%)	184 🔴 (-9.4%)	263 🔴 (-32%) 💚	30

📜 Previous results (1)

`8c32b94`

Wed, 22 Jul 2026 15:32:00 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	146 (+20%) 🔻	415 🔴 (+73%) 🔻	2121 🔴 (+553%) 🔻	2620 🔴 (+508%) 🔻	30
TTFS	stream	136 (-12%)	304 🔴 (-10%)	2368 🔴 (+542%) 🔻	4518 🔴 (+876%) 🔻	30
TTFS	hook + stream	259 (-16%) 💚	405 🔴 (-12%)	511 🔴 (+0.6%)	2710 🔴 (+336%) 🔻	30
STSO	1020 steps (1-20)	170 (-11%)	289 🔴 (-1.7%)	331 🔴 (-1.8%)	416 🔴 (+19%) 🔻	19
STSO	1020 steps (101-120)	208 (-6.7%)	323 🔴 (+0.6%)	384 🔴 (-21%) 💚	412 🔴 (-18%) 💚	19
STSO	1020 steps (1001-1020)	513 (-15%) 💚	667 🔴 (-15%)	713 🔴 (-18%) 💚	921 🔴 (-17%) 💚	19
WO	1020 steps	441418 (-17%) 💚	441418 (-17%) 💚	441418 (-17%) 💚	441418 (-17%) 💚	1
SL	stream latency	86 (-4.4%)	142 🔴 (-5.3%)	226 🔴 (+25%) 🔻	402 🔴 (+76%) 🔻	30

_{Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.}

_{Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt)}

_{Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt)}

_{🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120}

_{All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.}

_{Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.}

…omFile` once per file (#3052) Signed-off-by: Copilot <198982749+Copilot@users.noreply.github.com>

github-actions · 2026-07-24T18:30:28Z

Backport PR opened against stable: #3086. (backport job run)

…ry-2 * origin/main: (292 commits) feat(core): seal forwarded stream writes to the owner's public key (#3098) feat(core): seal hook payloads to the target run's public key (#3096) [e2e] Rebuild the event-log corruption repro around step-count divergence (#3147) feat: decrypt sealed payloads in the dashboard and CLI (#3146) Prewarm only appended replay payloads (#3131) feat: publish each run's X25519 public key on the run entity (#3095) feat(core): route sealed envelopes through the serialization layer (#3094) docs: redirect retired migration-guides URLs to comparisons (#3127) feat(core): add `encp` sealed-box encryption primitive (#3093) chore(core): clarify runtime comments (#3111) Remove obsolete world factory aliases (#3112) feat(core): deterministic sandbox hardening (#3045) Remove retired v1 step route plumbing (#3061) [core] Don't count racing invocations' duplicate step_started events toward the maxRetries ceiling (#3069) [world-testing] Isolate each spawned test server's data directory (#3055) fix: upgrade postcss to >=8.5.18 to address GHSA-r28c-9q8g-f849 (#3102) [next] Respect .gitignore in dev watcher to avoid EMFILE on large monorepos (#3085) [ci] Backport only stability fixes to `stable`, default to claude-opus-5 (#3092) perf(core): immediate leading-edge dispatch for idle streams (flush window default 0) (#3088) Optimize `processImportSpecifier` by computing `shouldFollowImportsFromFile` once per file (#3052) ... # Conflicts: # docs/components/geistdocs/desktop-menu.tsx # docs/components/geistdocs/mobile-menu.tsx # docs/content/docs/v5/cookbook/advanced/child-workflows.mdx # docs/content/docs/v5/cookbook/advanced/upgrading-workflows.mdx # docs/content/docs/v5/cookbook/agent-patterns/agent-cancellation.mdx # docs/content/docs/v5/cookbook/agent-patterns/durable-agent.mdx # docs/content/docs/v5/cookbook/agent-patterns/human-in-the-loop.mdx # docs/content/docs/v5/cookbook/common-patterns/batching.mdx # docs/content/docs/v5/cookbook/common-patterns/idempotency.mdx # docs/content/docs/v5/cookbook/common-patterns/rate-limiting.mdx # docs/content/docs/v5/cookbook/common-patterns/saga.mdx # docs/content/docs/v5/cookbook/common-patterns/scheduling.mdx # docs/content/docs/v5/cookbook/common-patterns/sequential-and-parallel.mdx # docs/content/docs/v5/cookbook/common-patterns/timeouts.mdx # docs/content/docs/v5/cookbook/common-patterns/webhooks.mdx # docs/content/docs/v5/cookbook/common-patterns/workflow-composition.mdx # docs/content/docs/v5/cookbook/index.mdx # docs/content/docs/v5/cookbook/integrations/ai-sdk.mdx # docs/content/docs/v5/cookbook/integrations/chat-sdk.mdx # docs/content/docs/v5/cookbook/integrations/sandbox.mdx # docs/next.config.ts # docs/proxy.ts # docs/scripts/lint.ts # pnpm-lock.yaml # pnpm-workspace.yaml

CopilotAI added 2 commits July 22, 2026 14:26

Optimize processImportSpecifier by hoisting shouldFollowImportsFromFi…
3371640
…le check

Add changeset for processImportSpecifier optimization
8c32b94

CopilotAI assigned Copilot and shuding Jul 22, 2026

Copilotcreated this pull request from a session on behalf of shuding July 22, 2026 15:15 View session

shuding marked this pull request as ready for review July 22, 2026 15:16

shuding requested review from a team and ijjk as code owners July 22, 2026 15:16

Merge branch 'main' into copilot/process-import-specifier-optimization
10fad5b

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VaguelySerious approved these changes Jul 23, 2026
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VaguelySerious enabled auto-merge (squash) July 23, 2026 23:54

VaguelySerious merged commit b406a04 into mainJul 24, 2026
243 of 248 checks passed

VaguelySerious deleted the copilot/process-import-specifier-optimization branch July 24, 2026 18:29

github-actionsBot added a commit that referenced this pull request Jul 24, 2026
Optimize processImportSpecifier by computing `shouldFollowImportsFr…
e8feabc
…omFile` once per file (#3052) Signed-off-by: Copilot <198982749+Copilot@users.noreply.github.com>

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Optimize `processImportSpecifier` by computing `shouldFollowImportsFromFile` once per file - #3052

Optimize `processImportSpecifier` by computing `shouldFollowImportsFromFile` once per file#3052
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CopilotAI commented Jul 22, 2026

Description

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🧪 E2E Test Results

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📊 Workflow Benchmarks

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