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Verification · Static analysis · Linting

Custom lint rules

Repository-specific rules written as plugins or pattern rules for mistakes that recur in review.

How to build it

Pick a recurring review comment and write the pattern it describes as a rule.
Write the rule as an ESLint plugin rule or a Semgrep pattern stored in the repository.
Add a test file for the rule with a failing example and a passing example.

Signals in a repository

A local ESLint plugin directory or an eslint-plugin-* dependency with custom rules.
A .semgrep.yml file or .semgrep/ directory with rules and matching test fixtures.

In practice

117 repositories run a tool for this check in the scanned set.

eslint · 107 repos
semgrep · 15 repos

Examples

freeCodeCamp/freeCodeCamp · eslint
```
eslint --max-warnings 0
```
nousresearch/hermes-agent · eslint
```
eslint {staged_files}
```

iptv-org/iptv · eslint

eslint scripts/**/*.{ts,js} tests/**/*.{ts,js}

vercel/next.js · eslint
```
eslint --config eslint.cli.config.mjs
```
facebook/react-native · eslint
```
eslint --max-warnings 0 .
```