// Why is my private field in the output?
// Teaching excerpts; see the explanation and boundaries on the episode page.

// Private controls type checking.
// Emitted JavaScript
class Box {
  code = "demo";
}

// JSON can still see that field.
JSON.stringify(new Box());
// {"code":"demo"}

// Hash fields stay private at runtime.
class Box {
  #code = "demo";
}
JSON.stringify(new Box());
// {}

// For server output, pick the fields.
const payload = { id: record.id };
JSON.stringify(payload);