tsconfig.json

{
  "version": "2.0.0",
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "jsx": "react",
    "target": "es2015",
    "sourceMap": true,
    "declaration": true,
    "module": "es2015",
    "removeComments": true,
    "outDir": "lib/",
    "moduleResolution": "node",
    "experimentalDecorators": false,
    "strict": true,
    "strictPropertyInitialization": false,
    "strictNullChecks": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "importHelpers": true,
    "stripInternal": true,
    "lib": ["es2015", "dom"]
  },
  "exclude": ["__tests__/**/*"],
  "include": ["src/**/*"],
  "files": ["src/index.ts"]
}