tsconfig.json

{
  "compilerOptions": {
    "rootDir": "src",
    /* Visit https://aka.ms/tsconfig.json to read more about this file */
    "target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "lib": [ /* Specify a set of bundled library declaration files that describe the target runtime environment. */
      "es2017",
      "es7",
      "es6",
      "dom"
    ],
    "module": "commonjs", /* Specify what module code is generated. */
    "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": "./dist", /* Specify an output folder for all emitted 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. */
  },
  "exclude": [
    "node_modules",
    "dist",
    "tests"
  ]
}