tsconfigbase.test.json

{
  "compilerOptions": {
    "declaration": true,
    "noImplicitAny": true,
    "noEmitOnError": true,
    "noUnusedLocals": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "target": "es2015",
    "outDir": "lib",
    "lib": ["es2015", "es2015.collection", "dom", "es2015.iterable", "es2017.object"],
    "types": ["jest", "node"],
    "jsx": "react",
    "resolveJsonModule": true,
    "esModuleInterop": true,
    "strictNullChecks": true,
    "skipLibCheck": true
  }
}