chore: Update to eslint v9 with flat config

.cspell/libraries.txt

@@ -61,6 +61,7 @@ ssim
 stylis
 Swimm
 tsbuildinfo
+tseslint
 Tuleap
 Typora
 unocss

eslint.config.js

@@ -0,0 +1,194 @@
+import cspell from '@cspell/eslint-plugin';
+import eslint from '@eslint/js';
+// @ts-ignore - no types available
+import cypress from 'eslint-plugin-cypress';
+import jsdoc from 'eslint-plugin-jsdoc';
+// @ts-ignore - no types available
+import json from 'eslint-plugin-json';
+// @ts-ignore - no types available
+import lodash from 'eslint-plugin-lodash';
+// @ts-ignore - no types available
+import noOnlyTests from 'eslint-plugin-no-only-tests';
+import tsdoc from 'eslint-plugin-tsdoc';
+// @ts-ignore - no types available
+import unicorn from 'eslint-plugin-unicorn';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    ignores: ['**/dist/', '**/node_modules/', '.git/', '**/generated/', '**/coverage/'],
+  },
+  {
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.eslint.json', './packages/*/tsconfig.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.es2020,
+        ...globals.jest,
+        cy: 'readonly',
+      },
+    },
+  },
+  {
+    plugins: {
+      json,
+      '@cspell': cspell,
+      'no-only-tests': noOnlyTests,
+      lodash,
+      unicorn,
+      cypress,
+      tsdoc,
+      jsdoc,
+    },
+    rules: {
+      curly: 'error',
+      'no-console': 'error',
+      'no-prototype-builtins': 'off',
+      'no-unused-vars': 'off',
+      'cypress/no-async-tests': 'off',
+      '@typescript-eslint/consistent-type-imports': 'error',
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-floating-promises': 'error',
+      '@typescript-eslint/no-misused-promises': 'error',
+      '@typescript-eslint/no-unused-vars': 'warn',
+      '@typescript-eslint/consistent-type-definitions': 'error',
+      '@typescript-eslint/ban-ts-comment': [
+        'error',
+        {
+          'ts-expect-error': 'allow-with-description',
+          'ts-ignore': 'allow-with-description',
+          'ts-nocheck': 'allow-with-description',
+          'ts-check': 'allow-with-description',
+          minimumDescriptionLength: 10,
+        },
+      ],
+      '@typescript-eslint/naming-convention': [
+        'error',
+        {
+          selector: 'typeLike',
+          format: ['PascalCase'],
+          custom: {
+            regex: '^I[A-Z]',
+            match: false,
+          },
+        },
+      ],
+      'json/*': ['error', 'allowComments'],
+      '@cspell/spellchecker': [
+        'error',
+        {
+          checkIdentifiers: true,
+          checkStrings: true,
+          checkStringTemplates: true,
+        },
+      ],
+      'no-empty': [
+        'error',
+        {
+          allowEmptyCatch: true,
+        },
+      ],
+      'no-only-tests/no-only-tests': 'error',
+      'lodash/import-scope': ['error', 'method'],
+      'unicorn/better-regex': 'error',
+      'unicorn/no-abusive-eslint-disable': 'error',
+      'unicorn/no-array-push-push': 'error',
+      'unicorn/no-for-loop': 'error',
+      'unicorn/no-instanceof-array': 'error',
+      'unicorn/no-typeof-undefined': 'error',
+      'unicorn/no-unnecessary-await': 'error',
+      'unicorn/no-unsafe-regex': 'warn',
+      'unicorn/no-useless-promise-resolve-reject': 'error',
+      'unicorn/prefer-array-find': 'error',
+      'unicorn/prefer-array-flat-map': 'error',
+      'unicorn/prefer-array-index-of': 'error',
+      'unicorn/prefer-array-some': 'error',
+      'unicorn/prefer-default-parameters': 'error',
+      'unicorn/prefer-includes': 'error',
+      'unicorn/prefer-negative-index': 'error',
+      'unicorn/prefer-object-from-entries': 'error',
+      'unicorn/prefer-string-starts-ends-with': 'error',
+      'unicorn/prefer-string-trim-start-end': 'error',
+      'unicorn/string-content': 'error',
+      'unicorn/prefer-spread': 'error',
+      'unicorn/no-lonely-if': 'error',
+    },
+  },
+  {
+    files: ['cypress/**', 'demos/**'],
+    rules: {
+      'no-console': 'off',
+    },
+  },
+  {
+    files: ['**/*.{js,jsx,mjs,cjs}'],
+    rules: {
+      'jsdoc/check-indentation': 'off',
+      'jsdoc/check-alignment': 'off',
+      'jsdoc/check-line-alignment': 'off',
+      'jsdoc/multiline-blocks': 'off',
+      'jsdoc/newline-after-description': 'off',
+      'jsdoc/tag-lines': 'off',
+      'jsdoc/require-param-description': 'off',
+      'jsdoc/require-param-type': 'off',
+      'jsdoc/require-returns': 'off',
+      'jsdoc/require-returns-description': 'off',
+    },
+  },
+  {
+    files: ['**/*.{ts,tsx}'],
+    rules: {
+      'no-restricted-syntax': [
+        'error',
+        {
+          selector: 'TSEnumDeclaration',
+          message:
+            'Prefer using TypeScript union types over TypeScript enum, since TypeScript enums have a bunch of issues, see https://dev.to/dvddpl/whats-the-problem-with-typescript-enums-2okj',
+        },
+      ],
+      'tsdoc/syntax': 'error',
+    },
+  },
+  {
+    files: ['**/*.spec.{ts,js}', 'cypress/**', 'demos/**', '**/docs/**'],
+    rules: {
+      'jsdoc/require-jsdoc': 'off',
+      '@typescript-eslint/no-unused-vars': 'off',
+    },
+  },
+  {
+    files: ['**/*.spec.{ts,js}', 'tests/**', 'cypress/**/*.js'],
+    rules: {
+      '@cspell/spellchecker': [
+        'error',
+        {
+          checkIdentifiers: false,
+          checkStrings: false,
+          checkStringTemplates: false,
+        },
+      ],
+    },
+  },
+  {
+    files: ['*.html', '*.md', '**/*.md/*'],
+    rules: {
+      'no-var': 'error',
+      'no-undef': 'off',
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/no-floating-promises': 'off',
+      '@typescript-eslint/no-misused-promises': 'off',
+    },
+    languageOptions: {
+      parserOptions: {
+        project: null,
+      },
+    },
+  }
+);