serialize-killer/tsconfig.json

Make your objects unserializable.

{
  "compilerOptions": {
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "declaration": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "module": "CommonJS",
    "moduleResolution": "node",
    "noImplicitReturns": true,
    "noUncheckedIndexedAccess": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "lib",
    "strict": true,
    "stripInternal": true,
    "target": "ES6"
  },
  "include": ["src"]
}