.eslintrc.js

const baseline = require('@mui/monorepo/.eslintrc');
const path = require('path');
const lodash = require('lodash');

const OneLevelImportMessage = [
  'Prefer one level nested imports to avoid bundling everything in dev mode or breaking CJS/ESM split.',
  'See https://github.com/mui/material-ui/pull/24147 for the kind of win it can unlock.',
].join('\n');

const ALLOWED_LODASH_METHODS = new Set(['throttle', 'debounce', 'set']);

const noRestrictedImports = {
  paths: [
    {
      name: '@mui/icons-material',
      message: 'Use @mui/icons-material/<Icon> instead.',
    },
    {
      name: 'lodash-es',
      importNames: Object.keys(lodash).filter((key) => !ALLOWED_LODASH_METHODS.has(key)),
      message:
        'Avoid kitchensink libraries like lodash-es. We prefer a slightly more verbose, but more universally understood javascript style',
    },
    {
      name: 'react-query',
      message: 'deprecated package, use @tanstack/react-query instead.',
    },
  ],
  patterns: [
    {
      group: ['lodash-es/*'],
      message: 'Use `import { debounce } from "lodash-es";` instead.',
    },
  ],
};

module.exports = {
  ...baseline,
  plugins: [...baseline.plugins, 'eslint-plugin-react-compiler', 'testing-library'],
  settings: {
    'import/resolver': {
      webpack: {
        config: path.join(__dirname, './eslintWebpackResolverConfig.js'),
      },
      exports: {},
    },
  },
  extends: [
    ...baseline.extends,
    // Motivation: https://github.com/shian15810/eslint-plugin-typescript-enum#motivations
    'plugin:typescript-enum/recommended',
  ],
  /**
   * Sorted alphanumerically within each group. built-in and each plugin form
   * their own groups.
   */
  rules: {
    ...baseline.rules,
    // TODO move to @mui/monorepo, codebase is moving away from default exports https://github.com/mui/material-ui/issues/21862
    'import/prefer-default-export': 'off',
    // TODO move rule into the main repo once it has upgraded
    '@typescript-eslint/return-await': 'off',
    'no-restricted-imports': ['error', noRestrictedImports],
    'no-restricted-syntax': [
      ...baseline.rules['no-restricted-syntax'].filter((rule) => {
        // Too opinionated for Toolpad
        return rule?.selector !== 'ForOfStatement';
      }),
    ],
    // Turning react/jsx-key back on.
    // https://github.com/airbnb/javascript/blob/5155aa5fc1ea9bb2c6493a06ddbd5c7a05414c86/packages/eslint-config-airbnb/rules/react.js#L94
    'react/jsx-key': ['error', { checkKeyMustBeforeSpread: true, warnOnDuplicates: true }],
    // This got turned of in the mono-repo:
    // See https://github.com/mui/toolpad/pull/866#discussion_r957222171
    'react/no-unused-prop-types': [
      'error',
      {
        customValidators: [],
        skipShapeProps: true,
      },
    ],
    'import/no-unresolved': [
      'error',
      {
        // https://github.com/import-js/eslint-plugin-import/issues/1739
        ignore: ['\\.md\\?muiMarkdown$'],
      },
    ],
    'material-ui/no-hardcoded-labels': 'off', // We are not really translating the docs/website anymore
    'react-compiler/react-compiler': 'error',
    'material-ui/disallow-react-api-in-server-components': 'off',
  },
  overrides: [
    ...baseline.overrides.map((override) => {
      if (override.rules['material-ui/disallow-react-api-in-server-components']) {
        return {
          ...override,
          files: ['packages/toolpad-core/src/*/*.?(c|m)[jt]s?(x)'],
        };
      }
      return override;
    }),
    {
      files: ['**/*.test.js', '**/*.test.ts', '**/*.test.tsx'],
      extends: ['plugin:testing-library/react'],
    },
    {
      files: ['docs/src/modules/components/**/*.js'],
      rules: {
        'material-ui/no-hardcoded-labels': 'off',
      },
    },
    {
      /**
       * TODO move to @mui/monorepo
       *
       * Examples are for demostration purposes and should not be considered as part of the library.
       * They don't contain an eslint setup, so we don't want them to contain eslint directives
       * We do however want to keep the rules in place to ensure the examples are following
       * a reasonably similar code style as the library.
       */
      files: ['examples/**/*'],
      rules: {
        'no-console': 'off',
        'no-underscore-dangle': 'off',
        // no node_modules in examples as they are not installed
        'import/no-unresolved': 'off',
      },
    },
    {
      files: [
        'packages/create-toolpad-app/**/*',
        'packages/toolpad-core/**/*',
        'packages/toolpad-utils/**/*',
      ],
      excludedFiles: [
        'tsup.config.ts',
        '*.spec.ts',
        '*.spec.tsx',
        '*.test.ts',
        '*.test.tsx',
        'vitest.config.mts',
        'vitest.config.*.mts',
      ],
      rules: {
        'import/no-extraneous-dependencies': ['error'],
      },
    },
    {
      // Starting small, we will progressively expand this to more packages.
      files: [
        // 'packages/create-toolpad-app/**/*',
        // 'packages/toolpad-core/**/*',
        'packages/toolpad-utils/**/*',
      ],
      rules: {
        '@typescript-eslint/no-explicit-any': ['error'],
      },
    },
    // TODO remove, fix this rule in the codebase
    {
      files: ['**'],
      rules: {
        'no-restricted-imports': ['error', noRestrictedImports],
      },
    },
    {
      files: ['docs/**/*{.ts,.tsx,.js}'],
      rules: {
        'no-restricted-imports': [
          'error',
          {
            paths: [
              {
                name: '@toolpad/core',
                message: OneLevelImportMessage,
              },
            ],
          },
        ],
      },
    },
  ],
};