feat: initial dev-configs monorepo

Shared configs for TypeScript projects: ESLint, Prettier, TypeScript,
Vite, Jest, Playwright, Knip. Published as @vigdorov/* npm packages
to Gitea registry.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/eslint/package.json

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+{
+    "name": "@vigdorov/eslint-config",
+    "version": "1.0.0",
+    "description": "Shared ESLint configuration with flat config",
+    "type": "module",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "files": ["dist"],
+    "exports": {
+        ".": "./dist/index.js",
+        "./base": "./dist/base.js",
+        "./react": "./dist/react.js",
+        "./node": "./dist/node.js"
+    },
+    "scripts": {
+        "build": "tsc"
+    },
+    "peerDependencies": {
+        "eslint": ">=9.0.0",
+        "typescript": ">=5.0.0"
+    },
+    "dependencies": {
+        "typescript-eslint": "^8.32.1",
+        "@stylistic/eslint-plugin": "^4.2.0",
+        "eslint-plugin-unused-imports": "^4.1.4"
+    },
+    "devDependencies": {
+        "eslint": "^9.27.0",
+        "typescript": "^5.8.3",
+        "@types/eslint": "^9.6.1"
+    },
+    "optionalDependencies": {
+        "eslint-plugin-react": "^7.37.5",
+        "eslint-plugin-react-hooks": "^5.2.0"
+    }
+}

packages/eslint/src/base.ts

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+import tseslint from 'typescript-eslint';
+import stylistic from '@stylistic/eslint-plugin';
+import unusedImports from 'eslint-plugin-unused-imports';
+import {qualityRules, typescriptRules, unusedImportsRules, stylisticRules} from './rules.js';
+
+type ConfigArray = ReturnType<typeof tseslint.config>;
+type ConfigOverride = (configs: ConfigArray) => ConfigArray;
+
+export function base(override: ConfigOverride = (c) => c): ConfigArray {
+    const configs = tseslint.config(
+        ...tseslint.configs.recommended,
+        {
+            plugins: {
+                '@stylistic': stylistic,
+                'unused-imports': unusedImports,
+            },
+            rules: {
+                ...qualityRules,
+                ...typescriptRules,
+                ...unusedImportsRules,
+                ...stylisticRules,
+            },
+        },
+        {
+            ignores: ['dist/', 'node_modules/', 'coverage/'],
+        },
+    );
+
+    return override(configs);
+}

packages/eslint/src/index.ts

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+export {base} from './base.js';
+export {react} from './react.js';
+export {node} from './node.js';

packages/eslint/src/node.ts

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+import tseslint from 'typescript-eslint';
+import {base} from './base.js';
+
+type ConfigArray = ReturnType<typeof tseslint.config>;
+type ConfigOverride = (configs: ConfigArray) => ConfigArray;
+
+export function node(override: ConfigOverride = (c) => c): ConfigArray {
+    return base(override);
+}

packages/eslint/src/react.ts

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+import tseslint from 'typescript-eslint';
+import reactPlugin from 'eslint-plugin-react';
+import reactHooksPlugin from 'eslint-plugin-react-hooks';
+import {base} from './base.js';
+import {reactRules, reactHooksRules} from './rules.js';
+
+type ConfigArray = ReturnType<typeof tseslint.config>;
+type ConfigOverride = (configs: ConfigArray) => ConfigArray;
+
+export function react(override: ConfigOverride = (c) => c): ConfigArray {
+    const baseConfigs = base();
+
+    const configs = tseslint.config(
+        ...baseConfigs,
+        {
+            plugins: {
+                'react': reactPlugin,
+                'react-hooks': reactHooksPlugin,
+            },
+            settings: {
+                react: {
+                    version: 'detect',
+                },
+            },
+            rules: {
+                ...reactRules,
+                ...reactHooksRules,
+            },
+        },
+    );
+
+    return override(configs);
+}

packages/eslint/src/rules.ts

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+import type {Linter} from 'eslint';
+
+type Rules = Partial<Linter.RulesRecord>;
+
+export const qualityRules: Rules = {
+    'eqeqeq': 'error',
+    'no-console': ['warn', {allow: ['warn', 'error']}],
+    'no-alert': 'warn',
+    'no-param-reassign': ['error', {props: true}],
+    'no-useless-concat': 'warn',
+    'no-else-return': 'warn',
+    'no-lonely-if': 'warn',
+    'no-constructor-return': 'warn',
+    'no-sequences': 'warn',
+    'prefer-promise-reject-errors': 'warn',
+    'require-await': 'warn',
+    'no-new': 'warn',
+    'no-multi-str': 'warn',
+    'no-multi-assign': 'warn',
+    'no-nested-ternary': 'warn',
+    'no-useless-computed-key': 'warn',
+    'no-useless-constructor': 'warn',
+    'no-var': 'warn',
+    'no-duplicate-imports': 'warn',
+    'no-plusplus': 'warn',
+    'no-bitwise': 'warn',
+    'prefer-const': 'warn',
+    'prefer-rest-params': 'warn',
+    'prefer-template': 'warn',
+    'array-callback-return': ['warn', {allowImplicit: true, checkForEach: true}],
+    'default-param-last': 'warn',
+    'yoda': 'warn',
+};
+
+export const typescriptRules: Rules = {
+    '@typescript-eslint/no-explicit-any': 'error',
+    '@typescript-eslint/no-empty-object-type': 'error',
+    '@typescript-eslint/no-unsafe-function-type': 'error',
+    '@typescript-eslint/no-wrapper-object-types': 'error',
+    '@typescript-eslint/no-use-before-define': 'warn',
+    '@typescript-eslint/no-shadow': 'warn',
+    'no-shadow': 'off',
+};
+
+export const unusedImportsRules: Rules = {
+    'unused-imports/no-unused-imports': 'warn',
+    'unused-imports/no-unused-vars': [
+        'warn',
+        {
+            vars: 'all',
+            varsIgnorePattern: '^_',
+            args: 'after-used',
+            argsIgnorePattern: '^_',
+        },
+    ],
+};
+
+export const stylisticRules: Rules = {
+    '@stylistic/no-multiple-empty-lines': ['warn', {max: 1}],
+    '@stylistic/lines-between-class-members': ['warn', 'always'],
+    '@stylistic/line-comment-position': ['warn', {position: 'above'}],
+    '@stylistic/multiline-comment-style': ['warn', 'starred-block'],
+    '@stylistic/capitalized-comments': 'warn',
+    '@stylistic/max-len': [
+        'warn',
+        {
+            code: 120,
+            ignoreComments: true,
+            ignoreUrls: true,
+            ignoreStrings: true,
+            ignoreTemplateLiterals: true,
+            ignoreRegExpLiterals: true,
+        },
+    ],
+};
+
+export const reactRules: Rules = {
+    'react/prop-types': 'off',
+    'react/react-in-jsx-scope': 'off',
+    'react/jsx-filename-extension': ['warn', {extensions: ['.tsx']}],
+    'react/jsx-props-no-spreading': 'warn',
+    'react/jsx-key': 'warn',
+    'react/no-array-index-key': 'warn',
+    'react/destructuring-assignment': 'warn',
+    'react/prefer-stateless-function': 'warn',
+    'react/jsx-fragments': ['off', 'element'],
+};
+
+export const reactHooksRules: Rules = {
+    'react-hooks/exhaustive-deps': 'warn',
+};

packages/eslint/tsconfig.json

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+{
+    "extends": "../../tsconfig.base.json",
+    "compilerOptions": {
+        "outDir": "dist",
+        "rootDir": "src"
+    },
+    "include": ["src"]
+}