React/create-React-App

What it measures: How tangled the control flow is — methods with many branches are hard to test and change.

Method: Cyclomatic complexity per method (1 + decision points), computed exhaustively across production source; test projects separated by convention. Deterministic.

Maturity: Documented → Verified → Prevented · effective 8.7 / 10 · rule-coverage 100% · ceiling Prevented

3 method(s) exceeded the cyclomatic complexity threshold of 15; the worst was exports at 41.

What to do

1. Resolve the 1 exports (cyclomatic 41) finding(s) in Cyclomatic Complexity — start with webpack.config.js. — One of this dimension's main actionable groups (1 warning-level).
2. Resolve the 1 exports (cyclomatic 19) finding(s) in Cyclomatic Complexity — start with create.js. — One of this dimension's main actionable groups (1 warning-level).
3. Resolve the 1 StackFrame (cyclomatic 19) finding(s) in Cyclomatic Complexity — start with StackFrame.js. — One of this dimension's main actionable groups (1 warning-level).
4. Enforce Cyclomatic Complexity in CI to reach Verified (currently Documented). — Hardens enforcement from Documented toward Prevented — provenance only; does not change the score.

Detailed fixes: d1_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: How hard the code is for a person to follow, beyond raw branching.

Method: Cognitive complexity per method (Sonar-style nesting-penalized score), computed exhaustively over production code, excluding test projects. Deterministic.

Maturity: Documented → Verified → Prevented · effective 8.5 / 10 · rule-coverage 100% · ceiling Prevented

7 method(s) exceeded the cognitive complexity threshold of 15; the worst was exports at 37.

+ 2 more group(s) — more in Appendix A; the complete list is findings.md.

What to do

1. Resolve the 1 exports (cognitive 37) finding(s) in Cognitive Complexity — start with webpack.config.js. — One of this dimension's main actionable groups (1 warning-level).
2. Resolve the 1 createApp (cognitive 19) finding(s) in Cognitive Complexity — start with createReactApp.js. — One of this dimension's main actionable groups (1 warning-level).
3. Resolve the 1 exports (cognitive 18) finding(s) in Cognitive Complexity — start with create.js. — One of this dimension's main actionable groups (1 warning-level).
4. Enforce Cognitive Complexity in CI to reach Verified (currently Documented). — Hardens enforcement from Documented toward Prevented — provenance only; does not change the score.

Detailed fixes: d2_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Over-large classes that try to do too much ("god classes").

Method: God-class detection by line and method-count thresholds per logical type (partial classes unified), filtered for generated code and registration/contract false positives. Deterministic.

Maturity: Documented → Verified → Prevented · effective 7.5 / 10 · rule-coverage 100% · ceiling Prevented

1 god class(es) detected.

What to do

1. Resolve the 1 FileTooLong finding(s) in God Classes — start with createReactApp.js. — One of this dimension's main actionable groups (1 warning-level).
2. Enforce God Classes in CI to reach Verified (currently Documented). — Hardens enforcement from Documented toward Prevented — provenance only; does not change the score.

Detailed fixes: d3_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Copy-pasted code that should be shared instead.

Method: Code duplication via token-stream sliding windows with type-aware normalization (locals masked, type names preserved), density-scored per KLoC of production code. Deterministic.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Verified

0 duplicated block group(s) detected.

✓ On the Gold path — maintain.

Detailed fixes: d4_recommendation.md.

What it measures: Whether volatile projects sit underneath others that depend on them (so their churn ripples upward), and whether project dependencies form cycles. A widely-depended-on but stable shared/kernel project is healthy, not penalised.

Method: Dependency cycles via elementary-DFS over real .csproj references, plus Martin instability (afferent/efferent) per project. Exhaustive over the reference graph, deterministic.

Coverage: Exhaustive · type-level: afferent/efferent coupling + cycles computed over every production type — the population is all types, not a name convention.

Maturity: Documented → Verified → Prevented · effective 6.9 / 10 · rule-coverage 100% · ceiling Prevented

0 projects, 0 dependency cycle(s), 0 unstable depended-on project(s).

What to do

1. Enforce Coupling in CI to reach Verified (currently Documented). — Hardens enforcement from Documented toward Prevented — provenance only; does not change the score.

Detailed fixes: d5_recommendation.md.

What it measures: How much of the code is actually exercised by tests.

Method: Coverage from coverlet runs or committed reports (Cobertura/OpenCover/lcov), computed per-file with structured exclusions for generated, trivial, and glue code. When the suite can't be built/run in-image AND no report is committed, coverage is reported NOT-MEASURED (excluded from the score) with the precondition to make it measurable — never a LoC-ratio proxy folded in as if measured. Deterministic.

Maturity: Documented → Verified → Prevented · effective 0.0 / 10 · rule-coverage 100% · ceiling Verified

No automated tests — the solution has no test code.

What to do

1. Resolve the 1 No automated tests finding(s) in Code Coverage. — One of this dimension's main actionable groups (1 issue-level).
2. Enforce Code Coverage in CI to reach Verified (currently Documented). — Hardens enforcement from Documented toward Verified — provenance only; does not change the score.

Detailed fixes: d8_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Whether the test suite has a healthy mix of unit / integration / end-to-end tests.

Method: Test projects classified (Unit/Integration/BDD/E2E) from compiled metadata; test methods counted exhaustively across projects with placement-agnostic disk fallback. Deterministic.

Maturity: Documented → Verified → Prevented · effective 0.0 / 10 · rule-coverage 100% · ceiling Documented

No test projects found.

What to do

1. Resolve the 1 No tests found finding(s) in Test Distribution. — One of this dimension's main actionable groups (1 recommendation-level).

Detailed fixes: d9_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Whether dependencies are current, secure, and not bloated.

Method: Manifest scan via dotnet list package across all projects; worst-signal-per-package deduction (saturating for vulnerabilities, capped-linear for deprecation/outdated) per KLoC. Exhaustive, deterministic.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Verified

0 outdated, 0 vulnerable, 0 deprecated packages.

✓ On the Gold path — maintain.

Detailed fixes: d12_recommendation.md.

What it measures: Whether any secrets (keys, tokens, passwords) have leaked into the code.

Method: In-process native secret scanner (entropy plus signature patterns) across all tracked files; no external tool. A clean result is a measured 10, not no-data zero. Deterministic.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Prevented

Secret scan ran and found no leaked secrets.

✓ On the Gold path — maintain.

Detailed fixes: d13_recommendation.md.

What it measures: Whether names — types, methods, variables — are clear and consistent.

Method: Judged by language model at low temperature (0.0-0.1) on a deterministic random symbol sample (fixed size, not exhaustive), with disclosed confidence band. Advisory, sampled.

Maturity: Documented → Verified → Prevented · effective Exemplary / 10 · rule-coverage 100% · ceiling Verified

0 naming inconsistencies across 0 sampled symbols.

✓ On the Gold path — maintain.

Detailed fixes: d21_recommendation.md.

What it measures: Whether each project is a focused, coherent unit rather than an oversized grab-bag.

Method: Project size overshoot penalties (LoC / public-type count / namespace count, 2-of-3 flag) weighted by log magnitude. Exhaustive across projects, deterministic, LLM-independent.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Documented

No projects to assess.

✓ On the Gold path — maintain.

Detailed fixes: d26_recommendation.md.

What it measures: How far you must trace to follow a call — low indirection and co-located slices read easier.

Method: Call indirection (interface hops, cross-namespace calls, slice-locality scaled) over a sampled set of method invocations, size-aware baseline. Sampled; confidence discounted by symbol-resolution gaps.

Coverage: Slice locality from the first namespace segments, SAMPLED (≤400 methods) — not exhaustive.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Documented

Too little code to assess navigability.

✓ On the Gold path — maintain.

Detailed fixes: d27_recommendation.md.

What it measures: Whether any secrets were ever committed — scanned across the full git history, not just now.

Method: Git-history secret scan via gitleaks detect over full history in an isolated checkout; each match flagged High. Exhaustive; degrades cleanly when tool absent.

Maturity: Documented → Verified → Prevented · effective 9.0 / 10 · rule-coverage 100% · ceiling Documented

1 finding(s): 0 critical, 1 high, 0 medium, 0 low.

✓ On the Gold path — maintain.

Detailed fixes: d28_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Real static-analysis (SAST) findings — likely security bugs in the code, any language.

Method: Polyglot static analysis via semgrep across the repo using the pinned, image-baked p/security-audit + p/owasp-top-ten rulesets (no scan-time registry fetch); severity rules (ERROR/WARNING/INFO) map to a full-band severity-weighted score. Exhaustive, deterministic; degrades on parse failure.

Coverage: semgrep pattern rules over all files — exhaustive for the rule set, blind to classes of bug without a rule (clean = no rule matched).

Maturity: Documented → Verified → Prevented · effective 2.1 / 10 · rule-coverage 100% · ceiling Documented

9 finding(s): 0 critical, 9 high, 0 medium, 0 low.

What to do

1. Resolve the 9 High finding(s) in Static Analysis (SAST) — start with build-and-test.yml (4), e2e-base.yml (3), lint.yml (2). — One of this dimension's main actionable groups (9 issue-level).

Detailed fixes: d29_recommendation.md · top locations in Appendix A, every location in findings.md.

What it measures: Whether JavaScript/npm dependencies have known published vulnerabilities (CVEs) — the npm ecosystem's biggest risk.

Method: JS/npm CVE scan via trivy fs --scanners vuln over JS manifests (package.json/yarn.lock/pnpm-lock/bun.lockb); 0-10 tight normalizer. NotApplicable without JS manifests. Exhaustive, deterministic.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Documented

No known-vulnerable JS/npm dependencies.

✓ On the Gold path — maintain.

Detailed fixes: d33_recommendation.md.

What it measures: Whether the repository publishes a coordinated-vulnerability-disclosure policy (SECURITY.md or security.txt) with a reporting contact, so finders know how to report a vulnerability. Presence of a policy file with a contact, not whether the policy is adequate or honoured.

Method: Vulnerability-disclosure policy read deterministically from the repo: a SECURITY.md (root/.github/docs) or .well-known/security.txt / security.txt, regex-checked for a reporting contact (email / URL / mailto). Present + contact → 10; present without a contact → 4; NotApplicable when no policy file exists (it may live off-repo). Detects the policy file's presence + contact, not its adequacy.

Maturity: Documented → Verified → Prevented · effective 10.0 / 10 · rule-coverage 100% · ceiling Documented

A vulnerability-disclosure policy (SECURITY.md) is published with a reporting contact.

✓ On the Gold path — maintain.

Detailed fixes: d37_recommendation.md.

What it measures: Whether dependencies have known published vulnerabilities (CVEs) per the OSV database — npm and other lockfile ecosystems, parsed natively. Complements D33 (npm via trivy) and D30 (.NET via dotnet).

Method: npm/multi-ecosystem CVE scan via osv-scanner (queries the osv.dev database + parses lockfiles natively: package-lock/yarn/pnpm/bun); severity tally (Critical/High/Medium/Low) to 0-10 tight normalizer (8.0). NotApplicable without a JS lockfile. Additive to D33 (trivy fs); exhaustive + deterministic, DB kept fresh.

Maturity: Documented → Verified → Prevented · effective 0.0 / 10 · rule-coverage 100% · ceiling Documented

203 finding(s): 13 critical, 96 high, 75 medium, 19 low.

What to do

1. Resolve the 37 High CVE finding(s) in OSV Dependency Vulnerabilities — start with package-lock.json (37). — One of this dimension's main actionable groups (37 issue-level).
2. Resolve the 13 Critical CVE finding(s) in OSV Dependency Vulnerabilities — start with package-lock.json (13). — One of this dimension's main actionable groups (13 issue-level).

Detailed fixes: d38_recommendation.md · top locations in Appendix A, every location in findings.md.

Other · Architecture — Whether the codebase has a recognisable, scale-appropriate structure (a named architectural style, or modular enough for its size) rather than being an ad-hoc ball of mud.

Method: Roslyn plus csproj analysis: architecture style detection (DDD, clean, vertical-slice, CQRS) and structure fitness for repo size. Deterministic.

Maturity · Maturity — Whether the repo and its projects have a README, and whether it's substantive and current.

Method: Filesystem scan: README presence, word count, and headings for depth; git history for staleness. Exhaustive across root and project dirs, deterministic.

What to do

• Add an 'Architecture' / 'How it works' section to the root README — the high-level shape.

Maturity · Maturity — Whether key decisions (ADRs) and the high-level shape (C4/diagrams) are written down.

Method: Filesystem scan: ADR folder/naming conventions or content, plus Mermaid/PlantUML/C4/architecture.md discovery. Exhaustive, deterministic.

• No Architecture Decision Records found — decisions aren't captured for future maintainers.
• No C4/PlantUML/Mermaid diagram or architecture.md — the high-level shape isn't documented.

What to do

• Start an ADR log (docs/adr/) recording significant decisions and their rationale.
• Add a C4 context/container diagram (Structurizr, PlantUML or Mermaid) or an architecture.md overview.

Maturity · Maturity — Whether the repo is organised deliberately — src/test separation and consistent project naming.

Method: Filesystem scan: src/test folder separation and namespace-prefix consistency (majority RootNamespace agreement). Exhaustive across projects, deterministic.

• Projects aren't grouped under a src/ folder — production and tooling code are mixed at the root.

What to do

• Group production code under src/ (or split deliberately, e.g. backend/ + frontend/) so production and tooling code aren't mixed at the root.

Maturity · Maturity — Whether the README actually describes the code that exists (LLM-judged, advisory).

Method: Judged by language model at low temperature: README accuracy versus actual projects, within a disclosed tolerance. Advisory, not a measured number.

Readiness · Readiness — Whether an automated pipeline builds and tests every change.

Method: Filesystem scan: CI workflow files (.github/workflows, .gitlab-ci.yml, etc.) for build and test stages. Exhaustive, deterministic.

Readiness · Readiness — Whether the code is diagnosable in production — structured logging, tracing/metrics, health checks.

Method: Filesystem/Roslyn scan: structured-logging frameworks (Serilog, NLog), OpenTelemetry, and health-check endpoint patterns. Exhaustive, deterministic.

• No ILogger/Serilog usage found — production issues will be hard to diagnose.

What to do

• Adopt ILogger (or Serilog) and log at meaningful points across the projects.
• Consider OpenTelemetry tracing/metrics and a health-check endpoint for operability.

Readiness · Readiness — Whether SAST, secret/dependency scanning and performance benchmarking are wired in (presence, not runtime).

Method: Filesystem/Roslyn scan: CodeQL, Dependabot, secret-scanning, and BenchmarkDotNet presence in pipelines and projects. Exhaustive, deterministic.

• No static application security testing (CodeQL / security analyzers / codehealth) detected.

What to do

• Add a SAST step (e.g. CodeQL) or a security analyzer package.
• Enable Dependabot/Renovate or a dependency-review gate.
• Add gitleaks/trufflehog in CI to block PRs that introduce committed secrets.

Readiness · Readiness — Whether releases are traceable — a maintained changelog and explicit version stamping.

Method: Filesystem scan: changelog file presence and version tags in csproj or git tags. Exhaustive, deterministic.

What to do

• Stamp a version (csproj <Version>, a VERSION file, or GitVersion) or tag releases with semver so builds and releases are traceable.

React / JS · Code Health — How much of the frontend is typed TypeScript vs untyped JavaScript.

Method: Frontend file inventory: the share of typed TypeScript vs untyped JavaScript across the source tree. Deterministic, exhaustive over frontend files.

• 13 typed · 264 plain JS

What to do

• Migrate the remaining .js/.jsx files to TypeScript.

React / JS · Code Health — Copy-pasted token-identical blocks across the frontend (the D4 clone algorithm over JS/TS tokens, D-386).

Method: Copy-pasted token-identical blocks across the frontend (the D4 clone algorithm run over JS/TS tokens). Deterministic.

• packages/react-error-overlay/fixtures/bundle.mjs:31095 · packages/react-error-overlay/fixtures/bundle.mjs:35866 · packages/react-error-overlay/fixtures/bundle.mjs:38243 · packages/react-error-overlay/fixtures/bundle_u.mjs:31221 — bundle.mjs:31095
• packages/react-error-overlay/fixtures/bundle.mjs:35867 · packages/react-error-overlay/fixtures/bundle.mjs:38257 · packages/react-error-overlay/fixtures/bundle_u.mjs:35993 · packages/react-error-overlay/fixtures/bundle_u.mjs:38383 — bundle.mjs:35867
• packages/react-error-overlay/fixtures/bundle.mjs:6853 · packages/react-error-overlay/fixtures/bundle.mjs:6867 · packages/react-error-overlay/fixtures/bundle.mjs:6881 · packages/react-error-overlay/fixtures/bundle.mjs:6895 — bundle.mjs:6853
• packages/react-error-overlay/fixtures/bundle.mjs:35620 · packages/react-error-overlay/fixtures/bundle.mjs:38178 · packages/react-error-overlay/fixtures/bundle_u.mjs:35746 · packages/react-error-overlay/fixtures/bundle_u.mjs:38304 — bundle.mjs:35620
• packages/react-error-overlay/fixtures/bundle.mjs:38273 · packages/react-error-overlay/fixtures/bundle_u.mjs:38399 — bundle.mjs:38273
• packages/react-error-overlay/fixtures/bundle.mjs:7171 · packages/react-error-overlay/fixtures/bundle_u.mjs:7295 — bundle.mjs:7171
• packages/react-error-overlay/fixtures/bundle.mjs:11964 · packages/react-error-overlay/fixtures/bundle_u.mjs:12100 — bundle.mjs:11964
• packages/react-dev-utils/FileSizeReporter.js:8 · packages/react-error-overlay/fixtures/bundle.mjs:2098 · packages/react-error-overlay/fixtures/bundle.mjs:5006 · packages/react-error-overlay/fixtures/bundle.mjs:5831 — FileSizeReporter.js:8

What to do

• Extract the duplicated blocks into shared functions/components.

React / JS · Architecture — Conformance to the detected frontend architecture layout (feature-sliced / layered src) plus cross-package deep-import rules (D-386).

Method: Conformance to the detected frontend layout (feature-sliced / layered src) plus cross-package deep-import rules, over the module graph. Deterministic.

• test/fixtures/boostrap-sass/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/builds-with-multiple-runtimes/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/global-scss-asset-resolution/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/issue-5176-flow-class-properties/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/issue-5947-not-typescript/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/jsconfig/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/mjs-support/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3
• test/fixtures/relative-paths/index.test.js:3 reaches into another package with a relative path (../__shared__/test-setup) — import the package by name instead. — index.test.js:3

What to do

• Fix the listed violations: import through public entries (package exports / slice index), never reach into another layer or package's internals.

React / JS · Code Health — Per-function cyclomatic/cognitive complexity from the token-level function scanner (D-386) — real branching, not a regex heuristic.

Method: Per-function cyclomatic/cognitive complexity from a token-level function scanner (real branching, not a regex heuristic), computed over every frontend function. Deterministic.

• Branch-heavy code is where defects cluster — extract decisions into smaller functions. (×8) — bundle.mjs:40412, bundle_u.mjs:40538, bundle.mjs:9907, …

What to do

• Break down the listed branch-heavy functions; aim P95 cyclomatic ≤ 5.

React / JS · Code Health — How many components/modules exceed the large-file threshold.

Method: Components/modules exceeding the large-file threshold, counted exhaustively across the frontend source tree. Deterministic.

What to do

• Split the oversized components into smaller, focused ones.

React / JS · Readiness — Static test reachability (D-386): the share of production files reachable from any test via the import graph — measured without running anything.

Method: Static test reachability: the share of production files reachable from any test via the import graph — measured without running anything. Deterministic.

• No test imports this module directly or transitively — its behavior is unverified. (×8) — bundle_u.mjs, bundle.mjs, WebpackDevServerUtils.js, …

What to do

• Add tests that import the unreached modules (directly or through their public entry).

React / JS · Readiness — How outdated the npm dependencies are (a maturity signal). JS/npm CVEs are scored separately in D33 (JS/npm Dependency Vulnerabilities).

Method: npm dependency staleness from manifest/registry metadata (a maturity signal; JS/npm CVEs are scored separately in D33). Deterministic.

React / JS · Readiness — Whether the project wires up test, lint and typecheck — detected from each package.json script's COMMAND (eslint / tsc / vitest / jest / playwright), not just its name, and corroborated against CI-workflow invocations so a tool run only in CI still counts.

Method: package.json scanned for test/lint/typecheck script wiring. Deterministic presence check.

• test ✓ · lint ✓ · typecheck ✗

What to do

• Add the missing tooling (eslint, tsc) as package.json scripts and run them in CI.

React / JS · Code Health — Files unreachable from every application/tooling/test entry point, and exports nothing imports (module-graph reachability, D-386).

Method: Dead code: files unreachable from every application/tooling/test entry point plus exports nothing imports, via module-graph reachability. Deterministic, exhaustive over the import graph.

• 4 file(s) (~73 LoC) were excluded from dead-code analysis — declare main/module/exports or a conventional entry (src/index.*, an index.html script) so reachability can see this package. — react-app-polyfill
• Unreachable from the 32 application, 9 tooling and 115 test entry point(s) detected in this repo. Gate removals on your build/type-check — an undetected custom entry would make these reachable.
• no import path from any entry point (32 application, 9 tooling, 115 test roots considered) (×6) — bundle_u.mjs, bundle.mjs, WebpackDevServerUtils.js, …

What to do

• Delete the dead files and unused exports — every line is maintenance cost and rebuild-estimate inflation with zero runtime value.

React / JS · Readiness — npm dependency truthfulness (D-386): unused dependencies, imports not declared anywhere, and type-/test-only packages shipped as production deps.

Method: npm dependency truthfulness: unused dependencies, imports declared nowhere, and type-/test-only packages shipped as production deps — from the manifest + import graph. Deterministic.

• Imported but not declared in any reachable package.json — installs work only by hoisting accident. (×3) — App.test.tsx:1, index.js:18, BaseUrl.js:10
• Declared in the root/package.json but never imported anywhere in that package or its workspace members — dead weight and attack surface. Verify against build tooling before removing. (×3)

What to do

• Remove unused dependencies, declare unlisted imports explicitly, and demote type-/test-only packages to devDependencies.

React / JS · Architecture — Import cycles in the module graph (D-386) — files that can only be understood and changed together.

Method: Import cycles in the module graph, detected exhaustively over JS/TS imports (the same cycle detection as the .NET coupling dimension). Deterministic.

• packages/react-error-overlay/src/components/CloseButton.js → packages/react-error-overlay/src/components/CodeBlock.js → packages/react-error-overlay/src/components/Collapsible.js → packages/react-error-overlay/src/components/ErrorOverlay.js → packages/react-error-overlay/src/components/Footer.js → packages/react-error-overlay/src/components/Header.js → packages/react-error-overlay/src/components/NavigationBar.js → packages/react-error-overlay/src/containers/CompileErrorContainer.js → packages/react-error-overlay/src/containers/RuntimeError.js → packages/react-error-overlay/src/containers/RuntimeErrorContainer.js → packages/react-error-overlay/src/containers/StackFrame.js → packages/react-error-overlay/src/containers/StackFrameCodeBlock.js → packages/react-error-overlay/src/containers/StackTrace.js → packages/react-error-overlay/src/iframeScript.js → packages/react-error-overlay/src/components/CloseButton.js — CloseButton.js
• test/fixtures/webpack-message-formatting/src/AppUnknownExport.js → test/fixtures/webpack-message-formatting/src/AppUnknownExport.js — AppUnknownExport.js

What to do

• Break each cycle by extracting the shared piece into a module both sides can import.

Other · Code Health — Whether the code avoids sync-over-async (deadlock-prone blocking on tasks) and async void.

Method: Roslyn syntax scan: async methods scanned for .Wait()/.GetAwaiter().GetResult() and async-void outside event handlers. Deterministic, hard fact per invocation.

Other · Code Health — Whether exceptions are handled rather than silently swallowed or rethrown with lost stack traces.

Method: Roslyn syntax scan: every catch clause counted; empty catches and bare rethrows flagged. Population is all catch clauses, not estimated. Deterministic, hard fact.

Other · Code Health — Whether log calls use message templates (queryable) rather than interpolated strings.

Method: Roslyn syntax scan: every log call-site counted; interpolated-string first-argument violations flagged. Population is all log calls, not estimated. Deterministic.