tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "ES6" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,

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

    /* Emit */
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "sourceMap": true /* Create source map files for emitted JavaScript files. */,
    "outDir": "build" /* Specify an output folder for all emitted files. */,

    /* Interop Constraints */
    "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. */,

    /* Completeness */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  },
  "exclude": [
    "node_modules" /* Exclude folder from compilation. */,
    "build" /* Exclude folder from compilation. */,
    "downloads" /* Exclude folder from compilation. */
  ]
}