eslint.config.js

import js from '@eslint/js'
import globals from 'globals'
import reactHooks from 'eslint-plugin-react-hooks'
import reactRefresh from 'eslint-plugin-react-refresh'
import tseslint from 'typescript-eslint'
import { defineConfig, globalIgnores } from 'eslint/config'

export default defineConfig([
  globalIgnores(['dist', 'node_modules', 'demo/dist', 'research']),
  {
    files: ['**/*.{js,jsx}'],
    extends: [
      js.configs.recommended,
      reactHooks.configs.flat.recommended,
      reactRefresh.configs.vite,
    ],
    languageOptions: {
      ecmaVersion: 2020,
      globals: { ...globals.browser, ...globals.node },
      parserOptions: {
        ecmaVersion: 'latest',
        ecmaFeatures: { jsx: true },
        sourceType: 'module',
      },
    },
    rules: {
      'no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]' }],
    },
  },
  {
    files: ['**/*.{ts,tsx}'],
    extends: [
      js.configs.recommended,
      ...tseslint.configs.recommended,
      reactHooks.configs.flat.recommended,
    ],
    languageOptions: {
      ecmaVersion: 2020,
      globals: globals.browser,
      parserOptions: {
        ecmaVersion: 'latest',
        ecmaFeatures: { jsx: true },
        sourceType: 'module',
      },
    },
    rules: {
      '@typescript-eslint/no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]', argsIgnorePattern: '^_' }],
      '@typescript-eslint/no-explicit-any': 'off',
      'no-unused-vars': 'off',
      // New react-hooks v7 rules — turned off because these patterns are intentional in this codebase:
      // apiRef mutation is the established imperative API pattern
      'react-hooks/immutability': 'off',
      // setState inside effects is used for tree/grouping initialization
      'react-hooks/set-state-in-effect': 'off',
      // React Compiler is not installed in this project
      'react-hooks/preserve-manual-memoization': 'off',
    },
  },
])