# linting-neostandard-eslint9

> Configures ESLint v9 flat config and neostandard for JavaScript and TypeScript projects, including migrating from legacy .eslintrc files or the standard package.

- Skill: `mcollina/linting-neostandard-eslint9` (Agent Skill, multi-file: 7 files)
- Install (CLI): `npx skillmds add mcollina/linting-neostandard-eslint9`
- Raw SKILL.md: https://api.skillmd.com/api/skills/mcollina/linting-neostandard-eslint9/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools, Dev Tooling
- Tags: Eslint, Flat Config, Javascript, Linting, Migration, Neostandard, Typescript
- Author: Matteo Collina (https://skillmd.com/u/mcollina)
- Updated: 2026-07-06
- Page: https://skillmd.com/skills/mcollina/linting-neostandard-eslint9

---


## When to use

Use this skill when you need to:
- Set up linting in a JavaScript or TypeScript project
- Use `neostandard` as a Standard-like ESLint v9 flat-config baseline
- Configure `eslint@9` with the flat config system (`eslint.config.js`/`eslint.config.mjs`)
- Migrate from `standard` to `neostandard` or ESLint v9
- Migrate from legacy `.eslintrc*` configuration to ESLint v9
- Run linting consistently in CI and local development

## Quick start: basic neostandard setup

Install dependencies and create a minimal `eslint.config.js`:

```bash
npm install --save-dev eslint@9 neostandard
```

```js
// eslint.config.js
import neostandard from 'neostandard'

export default neostandard()
```

Verify the config works:

```bash
npx eslint .
```

## Common setup workflow (new project)

1. Install `eslint@9` and `neostandard` (see Quick start above)
2. Create `eslint.config.js` with `neostandard()` as the base
3. Add any project-specific rule overrides on top
4. Run `npx eslint .` to confirm no config errors
5. Add a lint script to `package.json`: `"lint": "eslint ."`
6. Integrate into CI with a non-fix run; use `--fix` only in local workflows

## How to use

Read individual rule files for implementation details and examples:

- [rules/neostandard.md](rules/neostandard.md) - Install, configure, and extend neostandard with ESLint
- [rules/eslint-v9-flat-config.md](rules/eslint-v9-flat-config.md) - Build ESLint v9 flat config for JS/TS projects
- [rules/migration-from-standard.md](rules/migration-from-standard.md) - Migrate from `standard` to `neostandard` or ESLint v9
- [rules/migration-from-legacy-eslint.md](rules/migration-from-legacy-eslint.md) - Migrate from `.eslintrc*` to flat config safely
- [rules/ci-and-editor-integration.md](rules/ci-and-editor-integration.md) - CI scripts, pre-commit, and editor setup

## Core principles

- Prefer reproducible linting with pinned major versions
- Keep config minimal and explicit
- Use flat config for ESLint v9 projects
- Treat lint failures as quality gates in CI
- Enable auto-fix for local workflows, but validate with non-fix CI runs