Invalid project directory provided, no such directory: .../lint — `next lint` was removed in Next.js 16

Automated:

npx @next/codemod@canary next-lint-to-eslint-cli .

Manual. Before:

{ "scripts": { "lint": "next lint" } }

After:

{ "scripts": { "lint": "eslint ." } }

npm i -D eslint eslint-config-next

// eslint.config.mjs (replaces .eslintrc.json)
import { defineConfig, globalIgnores } from 'eslint/config'
import nextVitals from 'eslint-config-next/core-web-vitals'
import nextTs from 'eslint-config-next/typescript'

export default defineConfig([
  ...nextVitals,
  ...nextTs,
  globalIgnores(['.next/**', 'out/**', 'build/**', 'next-env.d.ts']),
])

Delete the eslint: {...} block from next.config. If CI relied on next build to fail on lint errors, add an explicit npm run lint step. eslint-config-next@16 requires ESLint 9 or later, and ESLint 10 drops .eslintrc support completely.