What ArcSight found in Turborepo

Real arc impact on Turborepo (packages/turbo-codemod) — blast radius, break paths, and evidence. Same question as the homepage: what breaks if I change this?

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Project: Turborepo (packages/turbo-codemod)Score: 93.7/100 (Excellent architecture)40 modules104 edges

arc impact src/types

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Proof summary

Four questions every public repository page must answer — see validation record.

What ArcSight found

High-risk module src/types (fan-in 21) — MEDIUM. src/types: fan-in 21, blast radius 28 modules. src/types — god-module. 40 modules and 104 dependency edges traced.

Why it matters

In Turborepo (packages/turbo-codemod), Change-risk signal at src/types (fan-in 21) — merge impact can travel beyond the diff you see. Blast radius on src/types reaches 28 downstream modules. ArcSight answers “what breaks if I change this?” before you ship; high fan-in is a change-risk signal, not a verdict on design quality.

What we'd inspect first

src/types
src/runner
src/runner/types

What evidence supports it

Local CLI analysis — repository source stays on your machine
Structural coverage: 40 modules, 104 edges in this snapshot
Reproducible fields match homepage live demo and frozen proof output

Architecture visualization

Diagrams are generated from ArcSight analysis data. Dependency graph and risk map show key modules; subsystem view shows high-level structure.

Dependency graph for this codebase — Dependency graph

Subsystem architecture for this codebase — Subsystem architecture

Architecture score & metrics

Score: 93.7/100 · Stability: 50/100 · Status: healthy · Confidence: 100%

Dependency cycles: 2
Duplicate authorities: 5

Critical findings

src/typesMEDIUMfan-in: 21
src/runnerMEDIUMfan-in: 18
src/runner/typesLOWfan-in: 3
src/runner/file-transformLOWfan-in: 1
src/runner/runnerLOWfan-in: 2

Hotspots

src/typesCRITICALfan-in: 21blast: 28
src/typesCRITICALfan-in: 21blast: 28
src/typesHIGHfan-in: 21blast: 28
src/runnerCRITICALfan-in: 18blast: 28
src/runnerCRITICALfan-in: 18blast: 28
src/runner/runnerCRITICALfan-in: 2blast: 28
src/utils/loggerCRITICALfan-in: 2blast: 28
src/utils/get-transformer-helpersCRITICALfan-in: 14blast: 17
src/utils/get-transformer-helpersMEDIUMfan-in: 14blast: 17
src/utils/load-turbo-jsonCRITICALfan-in: 9blast: 9

Architectural gravity centers

src/types— god-module
src/types— circular-dependency
src/types— utility-hub
src/runner— god-module
src/runner— circular-dependency

CLI workflow

Scan → Fix → Finish → Watch. Nothing else required.

arc scanFind issues
arc fixApply fixes
arc finishResolve remaining
arc watchKeep clean (Pro)

More commands (explain, impact, guard…) →

Key takeaways

•Architecture score 93.7/100 indicates a healthy structure with room to reduce cycles and violations.
•Structural scan reports dependency cycles — inspect impact paths before refactors that cross module boundaries.
•High fan-in modules are change-risk zones; run arc explain <path> before refactoring.
•Run the full workflow (analyze, hotspots, explain, impact, snapshot, drift) in your repo for deterministic architecture insights.

Run ArcSight on your repo

Install locally, then run arc impact on the file you plan to change — before merge.

npm install -g arcsight

arc impact <path>

Install →

Embed this report

Use this iframe to show the architecture badge on your site.

<iframe src="https://arcsight.ai/embed/turborepo/" width="320" height="180" frameborder="0"></iframe>

Evidence-backed analysis snapshot. Validation record · Install · Homepage demo