tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es6" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "lib": [
      "es2015",
      "dom"
    ] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,

    /* Modules */
    "module": "commonjs" /* Specify what module code is generated. */,

    /* Emit */
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "declarationMap": true /* Create sourcemaps for d.ts files. */,
    "sourceMap": true /* Create source map files for emitted JavaScript files. */,
    "outDir": "./dist" /* Specify an output folder for all emitted files. */,
    "baseUrl": "./",
    /* Interop Constraints */
    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
    "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
    "resolveJsonModule": true,
    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,

    /* Type Checking */
    "strict": true /* Enable all strict type-checking options. */,
    "strictNullChecks": true /* When type checking, take into account `null` and `undefined`. */,
    "strictPropertyInitialization": false,

    /* Completeness */
    "skipDefaultLibCheck": true /* Skip type checking .d.ts files that are included with TypeScript. */,
    "skipLibCheck": true /* Skip type checking all .d.ts files. */,

    "types": ["vitest/globals"]
  },
  "include": ["src", "test"],
  "exclude": ["node_modules", "dist"],
  "files": ["src/global.d.ts", "vitest.config.ts"]
}