tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "types": ["jest", "node"],

    /* Modules */
    "module": "commonjs" /* Specify what module code is generated. */,
    "rootDir": "./src" /* Specify the root folder within your source files. */,

    /* Emit */
    "declaration": false /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,

    /* Type Checking */
    "strict": true /* Enable all strict type-checking options. */,
    "allowUnusedLabels": false /* Disable error reporting for unused labels. */,
    "allowUnreachableCode": false /* Disable error reporting for unreachable code. */,

    /* Completeness */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  }
}