tsconfig.json

.json

{
  "compilerOptions": {
    "target": "es6",
    "allowJs": true,
    "checkJs": true,
    "moduleResolution": "node",
    "alwaysStrict": true,
    "strictNullChecks": false,
    "emitDeclarationOnly": true,
    "declaration": true,
    "outDir": "types",
    "removeComments": false
  },
  "files": [
    "src/index.js"
  ],
  "exclude": [
    "__tests__",
    "node_modules",
    "types"
  ]
}