tsconfig.json

{
  "include": ["packages", "types", "scripts"],
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "alwaysStrict": true,
    "baseUrl": ".",
    "emitDecoratorMetadata": false,
    "esModuleInterop": true,
    "experimentalDecorators": false,
    "importHelpers": true,
    "jsx": "react",
    "lib": ["dom", "esnext"],
    "moduleResolution": "node",
    "noFallthroughCasesInSwitch": false,
    "noImplicitAny": true,
    "noImplicitReturns": false,
    "noImplicitThis": true,
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "pretty": true,
    "sourceMap": true,
    "strict": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "stripInternal": true,
    "target": "es5",
    "typeRoots": ["./node_modules/@types", "./types"],
    "paths": {
      "$test/*": ["test/*"]
    }
  }
}