tsconfig.json

{
    "compilerOptions": {
        "target": "es2019",
        "module": "commonjs",
        "moduleResolution": "node",
        "typeRoots": [ "node_modules/@types" ], 
        "declaration": true,
        "outDir": "_out",
        "forceConsistentCasingInFileNames": true
    },
    "files": [
        "index.ts",
        "auth.ts"
    ]
}