tsconfig.json

{
  "compilerOptions": {
    "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "module": "commonjs",
    "typeRoots": ["./node_modules/@types", "./types"],
    "outDir": "./dist",
    "allowSyntheticDefaultImports": true /* Allow 'import x from y' when a module doesn't have a default export. */,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    /* Checking / Linting*/
    "strict": true,
    "strictNullChecks": true /* When type checking, take into account 'null' and 'undefined'. */,
    "strictFunctionTypes": true /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    "skipLibCheck": true
  },
  "exclude": ["node_modules"],
}