tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "lib": [
      "ES2018"
    ],
    "module": "CommonJS",
    "target": "ES2018",
    "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these 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. */
    "outDir": "build/dist",
    "checkJs": false,
    "types": [
      "@types/node",
      "@types/chai",
      "@types/mocha"
    ],
    "typeRoots": [
      "./node_modules/@types",
    ],
  }
}