tsconfig.json

{
  "compilerOptions": {
    "outDir": "lib",
    "module": "commonjs",
    "target": "es5",
    "lib": ["es5", "es6", "es7", "es2017"],
    "sourceMap": true,
    "allowJs": false,
    "jsx": "react",
    "moduleResolution": "node",
    "rootDirs": ["src"],
    "baseUrl": "./src",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "noUnusedLocals": true,
    "declaration": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "skipLibCheck": true,
    "emitDecoratorMetadata": true,
    "esModuleInterop": true,
    "typeRoots": ["./@types", "./node_modules/@types"]
  },
  "include": ["src/**/*", "__tests__"],
  "exclude": ["node_modules", "lib", "scripts", "__tests__"]
}