tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "ES2018",
        "allowJs": true,
        "skipLibCheck": true,
        "esModuleInterop": true,
        "declaration": true,
        "resolveJsonModule": true,
        "outDir": "dist"
    },
    "files": [
        "index.ts"
    ]
}