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/jest/package.json

@@ -0,0 +1,23 @@
+{
+    "name": "@vigdorov/jest-config",
+    "version": "1.0.0",
+    "description": "Shared Jest configuration",
+    "type": "module",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "files": ["dist"],
+    "scripts": {
+        "build": "tsc"
+    },
+    "peerDependencies": {
+        "jest": ">=29.0.0"
+    },
+    "dependencies": {
+        "@swc/jest": "^0.2.38"
+    },
+    "devDependencies": {
+        "jest": "^29.7.0",
+        "@types/jest": "^29.5.14",
+        "typescript": "^5.8.3"
+    }
+}

packages/jest/src/index.ts

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+export interface JestConfigOptions {
+    environment?: 'node' | 'jsdom';
+    aliases?: Record<string, string>;
+}
+
+function resolveAliases(aliases: Record<string, string>): Record<string, string> {
+    return Object.fromEntries(
+        Object.entries(aliases).map(([key, aliasPath]) => [`^${key}(.*)$`, `<rootDir>/${aliasPath}$1`]),
+    );
+}
+
+export function jestConfig(options: JestConfigOptions = {}) {
+    const {environment = 'node', aliases} = options;
+
+    return {
+        testEnvironment: environment === 'jsdom' ? 'jsdom' : 'node',
+        clearMocks: true,
+        collectCoverage: true,
+        coverageReporters: ['html', 'text', 'text-summary', 'lcov'],
+        coverageDirectory: 'coverage',
+        testMatch: ['**/__tests__/**/*.(j|t)s?(x)', '**/?(*.)+(spec|test).(j|t)s?(x)'],
+        testPathIgnorePatterns: ['/node_modules/', '/dist/'],
+        transform: {
+            '^.+\\.(t|j)sx?$': '@swc/jest',
+        },
+        ...(aliases ? {moduleNameMapper: resolveAliases(aliases)} : {}),
+    };
+}

packages/jest/tsconfig.json

@@ -0,0 +1,8 @@
+{
+    "extends": "../../tsconfig.base.json",
+    "compilerOptions": {
+        "outDir": "dist",
+        "rootDir": "src"
+    },
+    "include": ["src"]
+}