tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015",                                  
    "module": "CommonJS",                                /* specify what module code is generated. */
    "moduleResolution": "Node",
    "downlevelIteration": true,
    "lib": [
      "ES5", "ES6", "DOM", "DOM.Iterable"
    ],
    "baseUrl": "./src",                                  /* Specify the base directory to resolve non-relative module names. */
    "outDir": "./dist",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
    "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
    "emitDeclarationOnly": false,                      /* Only output d.ts files and not JavaScript files. */
    "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. */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
  },
  "include": ["src/**/*.ts", "**/*-test.{js,ts}"],
  "exclude": ["node_modules"]
}