tsconfig.json

{
    "compilerOptions": {
        "outDir": "./lib",
        "target": "ES5",
        "lib": ["dom", "dom.iterable", "esnext"],
        "allowJs": true,
        "checkJs": true,
        "skipLibCheck": true,
        "esModuleInterop": true,
        "allowSyntheticDefaultImports": true,
        "strict": true,
        "forceConsistentCasingInFileNames": true,
        "module": "es2015",
        "moduleResolution": "node",
        "isolatedModules": true,
        "noImplicitReturns": true,
        "noUnusedParameters": true,
        "sourceMap": true,
        "inlineSources": true,
        "resolveJsonModule": true,
        "downlevelIteration": true,
        "declaration": true,
        "jsx": "preserve",
        "jsxFactory": "h",
        "jsxFragmentFactory": "Fragment"
    },
    "include": ["./src/**/*.ts*"],
    "exclude": ["./src/__tests__/**/*.ts*"]
}