Configures ESLint v9 flat config and neostandard for JavaScript and TypeScript projects, including migrating from legacy `.eslintrc*` files or the `standard` package. Use when you need to set up or fix linting with `eslint.config.js` or `eslint.config.mjs`, troubleshoot lint errors, configure neosta

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 : Verify the config works: 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

linting-neostandard-eslint9