tsconfig.json

{
    "compilerOptions": {
        "outDir": "./lib",
        "declaration": true,
        "allowJs": true,
        "target": "es2016",
        "alwaysStrict": true,
        "skipLibCheck": true,
        "module": "commonjs",
    },
    "include": [
        "./index.ts",
        "./src/*",
    ],
    "exclude": [
        "node_modules",
    ],
}