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Semantic lint rules for the code-review questions a deterministic linter can't express
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- Updated Oct 2026
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Jevlint — ice-hazymoon
A linter whose rules are plain-English yes/no questions about code — secrets in logs, retry loops that run forever, leaked error messages — answered by TypeSafe's Jev as calibrated probabilities, with output shaped like any other linter.
- Stars
- 16
- Language
- TypeScript
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- ice-hazymoon
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is Jevlint — codegirl-007.
Used inJev for Software & DevTools
- Languages
- TypeScript
- Platforms
- CLI
- Capabilities
- Open sourceRequires API key
Highlights
- Each rule is one narrow question phrased so that yes means violation; Jev answers with a calibrated probability such as p=0.99 instead of free text.
- npx jevlint init writes jevlint.config.ts plus an example rule and two fixtures; npx jevlint test proves each rule passes its own fixtures.
- Prefilters, unless and filePrefilter regexes decide cases in code first, and an optional ast-grep candidates selector gives node-exact report ranges.
- Files up to 150 lines are judged as one chunk, larger ones are sliced, and a second pass narrows chunks over 40 lines to the window that actually fired.
- Requires Node.js 22+ or Bun and a TypeSafe or Vercel AI Gateway key; the README says to keep ESLint for anything syntax can decide.
Quickstart
bash
npm install --save-dev @hazymoon/jevlint typescript
npx jevlint init
npx jevlint test
npx jevlintWatch out
Grounded in the truncated repository README and GitHub metadata reviewed on 2026-10-15; the README publishes no rule-accuracy benchmarks, and it states directly that syntax-decidable questions are cheaper and exact in a deterministic linter.
Questions about this entry
Short answers drawn from the linked project or page.
Semantic, code-review-style questions such as whether a secret is being logged, whether a retry loop can run forever, or whether a handler leaks an internal error message — things a syntax-based linter cannot express.
A rule is one narrow question about the code, phrased so yes means violation, with criteria for true and false, a severity, matching files, an optional prefilter and a fix. Rules are defined with defineRule in jevlint.config.ts.
Every rule needs at least one invalid-* fixture that must fire and one valid-* fixture that must not; fixtures are plain text with a first line naming the pretended path, and npx jevlint test runs them.
A rule without candidates is judged per chunk (a file of 150 lines or less, or a packed slice), and a second pass narrows chunks over 40 lines to the window that fired. Adding an ast-grep candidates selector yields node-exact ranges.
Node.js 22+ or Bun, TypeScript 5.x or 6.x as a peer dependency, and an API key in AI_GATEWAY_API_KEY or TYPESAFE_API_KEY. Install with npm install --save-dev @hazymoon/jevlint typescript, then export the key and scan.
No. The README says to use jevlint alongside ESLint, not instead of it: if a rule can be decided from syntax alone, a deterministic linter is cheaper and exact, so those rules belong there.
No — this is ice-hazymoon's jevlint, published on npm as @hazymoon/jevlint, distinct from the unrelated iamtoomas/JevLint and huntedman/JevLint entries already in this catalog. It caches answers and exits with ordinary linter exit codes.
Reactions & coverage
Posts, threads, and videos about this entry from around the web.
Hacker News: Thread on Selmar's Jev code-review calibration notes and ordering.py comparisons.
Lectem2 pointsCalibrating Jev as a Code ReviewerRead the thread on Hacker NewsHacker News: Jev classifies agent PR hunks as P0, P1, or P2 so reviewers see P0 first.
namanbhulawat47 pointsJev Based Code ReviewRead the thread on Hacker NewsX: Magic Jev Ball for code review
X: jev-review: a local-first score loop for coding agents
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