Verifying JavaScript changes

• Security scanning Injection, unsafe APIs and tainted data reaching a sink.
  codeql 23% · 5 of 22 repos

  runs via GitHub Action github/codeql-action/analyze

  exit codes, docs, alternatives, where it runs

  • Runs inci
  • Alternativessemgrep 5%
  • Seen innodejs/node, mui/material-ui, mermaid-js/mermaid, expressjs/express, tj/commander.js
  • Docshttps://github.com/github/codeql
• Secret scanning Credentials and tokens committed to the repository.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Dependency audit Known-vulnerable or disallowed dependencies and licenses.
  dependency-review 14% · 3 of 22 repos

  runs via GitHub Action actions/dependency-review-action

  exit codes, docs, alternatives, where it runs

  • Runs inci
  • Alternativesnpm-audit 5%
  • Seen inaxios/axios, mermaid-js/mermaid, prettier/prettier
  • Docshttps://github.com/actions/dependency-review-action

• Enforce trust boundariesTreat every point where data crosses a trust boundary as a security checkpoint, not an afterthought. Concretely: 1. Never leak secrets ou...

  Decolua/9Router Security JavaScript llm-infra 2026-09-29

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• Strict Input ValidationAlways validate and constrain any user-controlled or data-driven strings (IDs, slugs, CLI flags, manifest/CSV fields) before using them t...

  bmad-code-org/bmad-method Security JavaScript security 2026-05-25

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• Guard trust boundariesTreat every point where data crosses a trust boundary — server to client, client to server, or internal module to external provider — as ...

  decolua/9router Security JavaScript llm-infra 2026-09-29

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• Fail-Closed Security HygieneSecurity gates and cleanup must be *fail-closed* and *boundary-proven*. Apply these rules when implementing/adjusting secure workflows: 1...

  QwenLM/qwen-code Security JavaScript ai-agents 2026-07-26

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• Validate untrusted input strictlyTreat any value that originates from user input, HTTP headers, or caller-supplied options as untrusted, and validate it with explicit, na...

  Expressjs/Express Security JavaScript app-frameworks 2025-10-16

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27 more in Security — the playbook lists the top 12.

• Type checking Wrong types, unhandled null or None, call signatures broken across modules.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Unit and integration tests Behaviour regressions on the paths the tests exercise.
  jest 32% · 7 of 22 repos

  jestcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenjest
jest --maxWorkers=2 --ci --reporters=default --reporters=jest-junit
jest --runInBand
  • Runs inci, local
  • Alternativesvitest 32%, mocha 18%, node-test 14%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, mermaid-js/mermaid, prettier/prettier, cypress-io/cypress
  • Docshttps://github.com/jestjs/jest
• Property-based tests Edge-case inputs nobody wrote a test for; invariants over generated data.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Preserve API compatibility and semanticsWhen adding or modifying public request/response/app methods, preserve their documented types, return values, and behavior unless the cha...

  expressjs/Express API JavaScript app-frameworks 2024-09-10

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• Strict null checksMany reported bugs stemmed from using generic truthy/falsy checks (`!x`, `x || y`, ternaries) when the real intent was to detect "missing...

  Expressjs/Express Null Handling JavaScript app-frameworks 2026-10-20

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• Propagate and clean up errorsNever swallow an error or silently end a response/stream — forward it to the correct error channel. In middleware/handlers that's `next(e...

  Expressjs/Express Error Handling JavaScript app-frameworks 2026-10-05

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• Narrow catches, log contextWhen handling errors, avoid two failure modes: (a) false-success/zero-signal outcomes and (b) silent data loss. Apply these rules consist...

  bmad-code-org/bmad-method Error Handling JavaScript app-frameworks 2026-07-28

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• Preserve API compatibilityWhen adding or changing public request/response methods, protect existing contracts and behavior instead of introducing silent breaking c...

  Expressjs/Express API JavaScript app-frameworks 2026-05-11

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65 more in API, Error Handling, Null Handling — the playbook lists the top 12.

• Unit and integration tests Behaviour regressions on the paths the tests exercise.
  jest 32% · 7 of 22 repos

  jestcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenjest
jest --maxWorkers=2 --ci --reporters=default --reporters=jest-junit
jest --runInBand
  • Runs inci, local
  • Alternativesvitest 32%, mocha 18%, node-test 14%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, mermaid-js/mermaid, prettier/prettier, cypress-io/cypress
  • Docshttps://github.com/jestjs/jest
• Version and platform matrix Breakage on a runtime version, OS or feature combination you did not run locally.
  ci-matrix 41% · 9 of 22 repos

  analyze (language: 2)copy

  exit codes, docs, alternatives, where it runs

  • Commands seenanalyze (language: 2)
Tests (include: 5)
analyze (language: 1)
  • Runs inci
  • Seen innodejs/node, mermaid-js/mermaid, sveltejs/svelte, expressjs/express, bmad-code-org/bmad-method, prettier/prettier
  • Docshttps://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/run-job-variations

• document workflow capabilitiesWorkflow methods should include comments that document their orchestration capabilities and data access patterns. This helps developers u...

  cloudflare/workers-sdk Temporal JavaScript cloud-infra 2025-06-02

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• Property-based tests Edge-case inputs nobody wrote a test for; invariants over generated data.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Fuzzing Crashes, panics and hangs on malformed input, especially in parsers and decoders.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Mutation testing Tests that keep passing whatever the code does.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Proofs and specifications Design-level bugs in protocols and algorithms, checked against a specification.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Correct Matching And ParsingWhen writing installers/transformers/validators that search, rewrite, or regenerate files, require *matching/parsing correctness*: only o...

  bmad-code-org/bmad-method Algorithms JavaScript app-frameworks 2026-04-26

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• prefer efficient algorithmsChoose more efficient algorithmic approaches by leveraging built-in methods and APIs instead of implementing manual solutions. This inclu...

  prettier/prettier Algorithms JavaScript devtools 2025-04-25

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• avoid expensive operationsIdentify and eliminate computationally expensive operations through early termination, better data structures, and algorithmic optimizati...

  sveltejs/svelte Algorithms JavaScript app-frameworks 2025-03-05

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• Invariant-Preserving Graph AlgorithmsWhen a graph/geometry algorithm is used recursively (or downstream computations depend on its shape/metrics), don’t patch symptoms. Prese...

  mermaid-js/mermaid Algorithms JavaScript devtools 2025-08-08

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• Validate boundaries and nestingWhen writing parsing, looping, or stateful algorithms, explicitly verify behavior at boundary conditions and across the full valid input ...

  chalk/chalk Algorithms JavaScript app-frameworks 2019-06-23

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5 more in Algorithms — the playbook lists the top 10.

• Concurrency model checking Races and orderings that fail only under specific interleavings.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Undefined-behaviour detection Memory-safety and aliasing violations in unsafe code.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Property-based tests Edge-case inputs nobody wrote a test for; invariants over generated data.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Race-free cancellation and liveness checksWhen wiring an `AbortSignal` (or any cancellation token) into async work — spawning processes, reading files, racing I/O — eliminate ever...

  can1357/oh-my-pi Concurrency JavaScript app-frameworks 2026-10-25

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• consistent async/await usageWhen refactoring code to use async/await, ensure complete and consistent adoption throughout the function or module. Avoid mixing async/a...

  serverless/serverless Concurrency JavaScript cloud-infra 2023-05-22

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• Concurrent operations completion managementWhen running concurrent operations in tests, ensure all operations complete before concluding the test. Race conditions occur when your t...

  fastify/fastify Concurrency JavaScript app-frameworks

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• Await all promisesAlways explicitly await all asynchronous operations, especially in cleanup code paths and resource management. Failing to properly await ...

  nodejs/node Concurrency JavaScript runtimes 2025-06-22

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• Simplify async patternsUse modern promise utilities and clean async patterns instead of manual promise construction. Prefer Promise.withResolvers() over manual ...

  cloudflare/workerd Concurrency JavaScript cloud-infra 2025-07-18

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7 more in Concurrency — the playbook lists the top 12.

• Unit and integration tests Behaviour regressions on the paths the tests exercise.
  jest 32% · 7 of 22 repos

  jestcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenjest
jest --maxWorkers=2 --ci --reporters=default --reporters=jest-junit
jest --runInBand
  • Runs inci, local
  • Alternativesvitest 32%, mocha 18%, node-test 14%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, mermaid-js/mermaid, prettier/prettier, cypress-io/cypress
  • Docshttps://github.com/jestjs/jest
• Fuzzing Crashes, panics and hangs on malformed input, especially in parsers and decoders.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• RFC-compliant HTTP semanticsWhen implementing HTTP-level behavior—headers, charsets, content negotiation—always conform to the governing RFC rather than relying on i...

  Expressjs/Express Networking JavaScript app-frameworks 2026-01-19

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• RFC-compliant protocol handlingWhen implementing HTTP-related features—header generation/parsing, charset declarations, content negotiation, or IP address comparisons—v...

  expressjs/Express Networking JavaScript app-frameworks 2026-01-19

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• Handle streams properlyWhen transferring data over HTTP, properly implement streaming mechanisms to prevent memory exhaustion and potential denial-of-service vu...

  expressjs/express Networking JavaScript app-frameworks 2023-05-30

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• Content integrity verificationWhen handling HTTP responses, especially with streaming data, properly verify content integrity and length to prevent data corruption or ...

  aws/aws-sdk-js Networking JavaScript cloud-infra 2020-10-20

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• Proxy protocol handlingWhen implementing HTTP clients with proxy support, ensure the connection to the proxy uses the protocol specified in the proxy configurat...

  axios/axios Networking JavaScript app-frameworks

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10 more in Networking, Axios — the playbook lists the top 12.

• End-to-end browser tests User flows broken across components, routing and the network.
  playwright 18% · 4 of 22 repos

  playwright testcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenplaywright test
playwright test $(node scripts/e2e-tier-scope.mjs pr-check nightly-check
playwright test ${SPECS[@]} --shard=${SHARD}/${SHARD_TOTAL}
  • Runs inci, local
  • Seen infacebook/react, vercel/next.js, mui/material-ui, mermaid-js/mermaid
  • Docshttps://github.com/microsoft/playwright
• Linting Bug-prone patterns, unused code and conventions the formatter does not cover.
  eslint 95% · 21 of 22 repos autofix

  eslint .copy

  exit codes, docs, alternatives, where it runs

  • Exit codes0 no errors
    1 linting errors found
    2 configuration problem or internal error
  • Commands seeneslint .
eslint
eslint --fix
  • Runs inci, local
  • Alternativesbiome 5%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, nodejs/node, axios/axios, mui/material-ui
  • Docshttps://eslint.org/docs/latest/use/command-line-interface#exit-codes

• Effective Cache Management in Next.js ApplicationsWhen implementing caching in Next.js applications, it is crucial to be intentional about the caching behavior for each component and func...

  vercel/next.js Next.js JavaScript app-frameworks

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• Secure Data Handling in Next.js ApplicationsWhen building Next.js applications that handle sensitive data, it's crucial to implement robust security measures to prevent data leakage...

  vercel/next.js Next.js JavaScript app-frameworks

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• Handling Dynamic Content in Next.js ComponentsWhen implementing Next.js components that rely on dynamic content (e.g. random values, current time), it is crucial to use proper boundar...

  vercel/next.js Next.js JavaScript app-frameworks

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• Optimize Next.js Resource UtilizationAs a code reviewer, I recommend the following practices to optimize resource utilization when implementing Next.js applications.

  vercel/next.js Next.js JavaScript app-frameworks

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• Strict mode-proof hooksEnsure your React components work correctly in both development (Strict Mode) and production environments by writing hooks that handle Re...

  mui/material-ui React JavaScript app-frameworks 2025-06-27

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12 more in React, Next, Next.js, Vue, Angular — the playbook lists the top 12.

• Unit and integration tests Behaviour regressions on the paths the tests exercise.
  jest 32% · 7 of 22 repos

  jestcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenjest
jest --maxWorkers=2 --ci --reporters=default --reporters=jest-junit
jest --runInBand
  • Runs inci, local
  • Alternativesvitest 32%, mocha 18%, node-test 14%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, mermaid-js/mermaid, prettier/prettier, cypress-io/cypress
  • Docshttps://github.com/jestjs/jest
• Version and platform matrix Breakage on a runtime version, OS or feature combination you did not run locally.
  ci-matrix 41% · 9 of 22 repos

  analyze (language: 2)copy

  exit codes, docs, alternatives, where it runs

  • Commands seenanalyze (language: 2)
Tests (include: 5)
analyze (language: 1)
  • Runs inci
  • Seen innodejs/node, mermaid-js/mermaid, sveltejs/svelte, expressjs/express, bmad-code-org/bmad-method, prettier/prettier
  • Docshttps://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/run-job-variations

• Cache correctness validationEnsure caching implementations store the correct data and use appropriate strategies for the context. Cache should store the final proces...

  prettier/prettier Caching JavaScript devtools 2025-02-12

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• Active Cache & Config SafetyWhen implementing caching layers/providers and cache-driven handlers: - **Assume multiple cache instances may exist.** Avoid single “defa...

  tanstack/query Caching JavaScript app-frameworks 2020-05-14

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• Limit cache sizeAlways implement size constraints on caches to prevent memory leaks and performance degradation. Unbounded caches can grow continuously a...

  aws/aws-sdk-js Caching JavaScript cloud-infra 2018-10-30

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No tool-based check applies. The review prompts below are the verification.

• Avoid hot-path overheadIn performance-sensitive, frequently-executed code paths (per-request handlers, middleware, core request/response methods), minimize unne...

  expressjs/Express Performance Optimization JavaScript app-frameworks 2026-06-26

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• Hot-path efficiencyCode that runs per-request or in other hot paths must avoid unnecessary overhead. Prefer simple, cheap operations over heavier alternativ...

  Expressjs/Express Performance Optimization JavaScript app-frameworks 2026-06-26

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• Benchmark before optimizing codePerformance optimizations should be validated through benchmarks before implementation. This helps prevent premature optimization and ens...

  nodejs/node Performance Optimization JavaScript runtimes 2025-06-28

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• Measure performance impactBefore making performance-related changes, measure the actual impact with benchmarks and profiling. Many performance assumptions can be m...

  sveltejs/svelte Performance Optimization JavaScript app-frameworks 2025-05-20

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• Eliminate redundant operationsIdentify and eliminate repeated expensive operations to improve performance. Look for opportunities to cache results, avoid duplicate com...

  serverless/serverless Performance Optimization JavaScript cloud-infra 2024-07-29

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14 more in Performance Optimization — the playbook lists the top 12.

• Unit and integration tests Behaviour regressions on the paths the tests exercise.
  jest 32% · 7 of 22 repos

  jestcopy

  exit codes, docs, alternatives, where it runs

  • Commands seenjest
jest --maxWorkers=2 --ci --reporters=default --reporters=jest-junit
jest --runInBand
  • Runs inci, local
  • Alternativesvitest 32%, mocha 18%, node-test 14%
  • Seen infacebook/react, vercel/next.js, facebook/react-native, mermaid-js/mermaid, prettier/prettier, cypress-io/cypress
  • Docshttps://github.com/jestjs/jest

• LLM provider translation fidelityWhen writing adapters that translate between different LLM provider wire formats (OpenAI chat/completions, Responses API, Anthropic, Gemi...

  Decolua/9Router AI JavaScript llm-infra 2026-09-29

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• Consistent AI namingUse specific and consistent naming conventions when referencing AI services, models, and their parameters throughout your codebase. Alway...

  langchain-ai/langchainjs AI JavaScript ai-agents 2025-04-28

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• Control Agent Context BudgetsAlways cap and actively prevent generative-agent context bloat. 1) Enforce explicit context/prompt budgets in code (hard max + warning th...

  bmad-code-org/bmad-method AI JavaScript ai-agents 2026-01-15

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No tool-based check applies. The review prompts below are the verification.

• standardize log output methodsUse `process.stdout.write` instead of `console.log` for controlled logging output to avoid linter issues and ensure consistent behavior. ...

  serverless/serverless Logging JavaScript cloud-infra 2022-02-28

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• Choose appropriate log levelsSelect log levels based on the intended audience and actionability of the message. Use `debug` for internal development information that ...

  cypress-io/cypress Logging JavaScript devtools 2021-10-12

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• Format observability test dataWhen writing tests for observability systems (tracing, metrics, logging), structure test assertions to be easily readable and debuggable....

  cloudflare/workerd Observability JavaScript cloud-infra 2025-08-23

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• Use appropriate log levelsChoose logging levels that match the intended audience and purpose of the message. Use debug or silent logging for internal operations, o...

  facebook/react-native Logging JavaScript app-frameworks 2025-05-09

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• Support flexible loggingWhen designing logging interfaces, create flexible APIs that accommodate both standard and custom logging needs. This includes supporting...

  fastify/fastify Logging JavaScript app-frameworks

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• CI workflow linting Broken GitHub Actions syntax, script injection, over-broad token permissions.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• File hygiene Invalid JSON, YAML or TOML, merge markers, trailing whitespace, oversized files.
  pre-commit-hooks 5% · 1 of 22 repos autofix

  runs via pre-commit hook check-json

  exit codes, docs, alternatives, where it runs

  • Runs inpre-commit, ci
  • Seen inbmad-code-org/bmad-method
  • Docshttps://github.com/pre-commit/pre-commit-hooks

• Configuration validation and defaultsAlways validate configuration structure before accessing properties and provide sensible defaults while preserving explicit user override...

  facebook/react-native Configurations JavaScript app-frameworks 2025-02-25

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• Explicit override correctnessWhen handling configuration from CLI/UI (e.g., `--set`, channel flags, migration prompts), treat user-provided values as explicit asserti...

  bmad-code-org/bmad-method Configurations JavaScript cloud-infra 2026-04-29

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• Environment-driven config resolutionWhen behavior depends on environment variables or config files (e.g. git's `core.hooksPath`, `GIT_DIR`, `GIT_CONFIG*`), never assume an i...

  can1357/oh-my-pi Configurations JavaScript cloud-infra 2026-10-18

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• App settings managementTreat application settings as a well-defined, centrally managed API rather than ad-hoc values scattered through the codebase. - Always re...

  expressjs/Express Configurations JavaScript app-frameworks 2026-03-21

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• Config-driven themingWhen rendering/layout is affected by configuration or theming, avoid magic numbers and ad-hoc config handling. Instead: - Use a centraliz...

  mermaid-js/mermaid Configurations JavaScript devtools 2026-01-15

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32 more in CI/CD, Configurations — the playbook lists the top 12.

• Dependency audit Known-vulnerable or disallowed dependencies and licenses.
  dependency-review 14% · 3 of 22 repos

  runs via GitHub Action actions/dependency-review-action

  exit codes, docs, alternatives, where it runs

  • Runs inci
  • Alternativesnpm-audit 5%
  • Seen inaxios/axios, mermaid-js/mermaid, prettier/prettier
  • Docshttps://github.com/actions/dependency-review-action
• Lockfile consistency A lockfile that no longer matches its manifest.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Version and platform matrix Breakage on a runtime version, OS or feature combination you did not run locally.
  ci-matrix 41% · 9 of 22 repos

  analyze (language: 2)copy

  exit codes, docs, alternatives, where it runs

  • Commands seenanalyze (language: 2)
Tests (include: 5)
analyze (language: 1)
  • Runs inci
  • Seen innodejs/node, mermaid-js/mermaid, sveltejs/svelte, expressjs/express, bmad-code-org/bmad-method, prettier/prettier
  • Docshttps://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/run-job-variations

• Mutation testing Tests that keep passing whatever the code does.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Version and platform matrix Breakage on a runtime version, OS or feature combination you did not run locally.
  ci-matrix 41% · 9 of 22 repos

  analyze (language: 2)copy

  exit codes, docs, alternatives, where it runs

  • Commands seenanalyze (language: 2)
Tests (include: 5)
analyze (language: 1)
  • Runs inci
  • Seen innodejs/node, mermaid-js/mermaid, sveltejs/svelte, expressjs/express, bmad-code-org/bmad-method, prettier/prettier
  • Docshttps://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/run-job-variations

• Use runServerless utilityAll new tests must be written using the `runServerless` utility instead of legacy testing approaches. This utility provides a more reliab...

  serverless/serverless Testing JavaScript cloud-infra 2023-05-25

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• Robust async test patternsWrite tests that exercise functionality the same way a real consumer would, and make sure asynchronous tests fail loudly rather than hang...

  Expressjs/Express Testing JavaScript app-frameworks 2026-10-05

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• Use specific assertion methodsChoose the appropriate assertion method based on the data type being tested. This improves test readability and provides clearer error me...

  fastify/fastify Testing JavaScript app-frameworks

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• Branch-Exact Test CoverageMake workflow/test suites “branch-complete and predicate-exact”: every reachable `case` arm and every required gating condition must be e...

  QwenLM/qwen-code Testing JavaScript ai-agents 2026-07-29

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• Test fidelity and assertionsTests must exercise the real production code path and fail with clear, actionable diagnostics when they break. 1. Never duplicate impleme...

  Decolua/9Router Testing JavaScript llm-infra 2026-09-06

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23 more in Testing — the playbook lists the top 12.

• Docs build Broken cross-references, links and markup in documentation.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Spelling Typos in identifiers, comments and docs.

  No scanned repository in this language runs a tool for this. Lean on the review prompts.

• Document complex APIsRequire comprehensive JSDoc documentation for classes, complex functions, and all exported functions to improve codebase maintainability ...

  sveltejs/svelte Documentation JavaScript app-frameworks 2025-07-08

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• Document APIs thoroughlyAll public API elements must be thoroughly documented with JSDoc annotations that clearly explain their purpose, parameters, return value...

  aws/aws-sdk-js Documentation JavaScript cloud-infra 2018-10-30

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• Document with precise accuracyMaintain precise and accurate documentation through both JSDoc annotations and explanatory comments. Ensure all technical documentation m...

  nodejs/node Documentation JavaScript runtimes 2025-06-27

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• Add explanatory commentsAdd explanatory comments for complex logic, special cases, or non-obvious code behavior. Comments should explain the "why" behind the cod...

  prettier/prettier Documentation JavaScript devtools 2023-11-10

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• Consistent JSDoc standardsDocument all public APIs and significant internal functions with comprehensive JSDoc comments that include accurate descriptions, paramet...

  fastify/fastify Documentation JavaScript app-frameworks

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8 more in Documentation — the playbook lists the top 12.