eslint-plugin-modernization

⭐ If this plugin caught a real bug for you, star the repo — it's the signal that keeps these rules maintained.

Description

This plugin provides Modernization rules — prefer modern ES idioms over legacy patterns.

• Why — a linter nobody reads protects nothing. We would rather miss a finding than spend your attention on one that was never real.
• How — evidence, not names. A rule fires on what the code does, resolved through the AST and ESLint's own scope analysis.
• What — every finding carries its fix, in prose for a human and as structured JSON for an agent. Security rules add a CWE mapping and, where assigned, a CVSS score.

That trade costs recall, and we measure it: methodology · results · a false positive is a bug.

Getting Started

• To check out the guide, visit eslint.interlace.tools. 📚

npm install eslint-plugin-modernization --save-dev

⚙️ Configuration Presets

🏢 Usage Example

// eslint.config.js
import modernization from 'eslint-plugin-modernization';

export default [
  modernization.configs.recommended,

  // Or be strict about modernization
  // modernization.configs.strict,
];

Why These Rules?

no-instanceof-array

instanceof Array fails across different realms (iframes, workers). Array.isArray() is the correct, reliable check.

// ❌ Bad: Fails across realms
if (value instanceof Array) {
}

// ✅ Good: Works everywhere
if (Array.isArray(value)) {
}

prefer-at

Array.at() provides cleaner negative index access (ES2022+).

// ❌ Bad: Verbose negative index access
const last = arr[arr.length - 1];

// ✅ Good: Clean ES2022+ syntax
const last = arr.at(-1);

prefer-event-target

EventTarget is the native browser API and doesn't require Node.js polyfills.

// ❌ Bad: Requires polyfill in browsers
import { EventEmitter } from 'events';

// ✅ Good: Native browser API
const target = new EventTarget();

📦 Compatibility

See the ESLint Version Support Policy — current ecosystem share data, the 20% gate, and the forward-looking exception that covers v10.

Rules

Legend

🔗 Related ESLint Plugins

Part of the Interlace ESLint ecosystem — AI-native rules with LLM-optimized error messages:

Security

Plugin	Downloads	Description
eslint-plugin-anthropic-security		Anthropic SDK security.
eslint-plugin-browser-security		XSS, DOM security.
eslint-plugin-drizzle-security		Drizzle security.
eslint-plugin-express-security		Express middleware hardening.
eslint-plugin-gemini-security		Google Gemini SDK security.
eslint-plugin-jwt-security		Token security.
eslint-plugin-knex-security		Knex security.
eslint-plugin-lambda-security		AWS Lambda hardening.
eslint-plugin-mcp-sdk-security		MCP SDK security.
eslint-plugin-mongodb-security		MongoDB injection.
eslint-plugin-mysql-security		MySQL security.
eslint-plugin-nestjs-security		NestJS framework hardening.
eslint-plugin-node-security		Server-side patterns.
eslint-plugin-openai-security		OpenAI SDK security.
eslint-plugin-postgresql-security		PostgreSQL security.
eslint-plugin-prisma-security		Prisma security.
eslint-plugin-secure-coding		Injection prevention.
eslint-plugin-sequelize-security		Sequelize ORM security.
eslint-plugin-sqlite-security		SQLite security.
eslint-plugin-supabase-security		Supabase security.
eslint-plugin-typeorm-security		TypeORM security.
eslint-plugin-vercel-ai-security		AI SDK security.

Code quality

Plugin	Downloads	Description
eslint-plugin-conventions		Team-specific habits and styles.
eslint-plugin-import-next		Fast cycle + import-graph analysis.
eslint-plugin-maintainability		Cognitive load and clean-code patterns.
eslint-plugin-modularity		Structural integrity and DDD patterns.
eslint-plugin-operability		Production readiness and resource health.
eslint-plugin-react-a11y		React accessibility / WCAG.
eslint-plugin-react-features		React best practices and optimization.
eslint-plugin-reliability		Runtime stability and error safety.

⭐ Support & follow

If this plugin caught a real bug for you, star the repo — stars are the signal that keeps the Interlace ESLint ecosystem maintained — and follow the writeups on Dev.to for the benchmarks and security research behind these rules.

📄 License

MIT © Ofri Peretz