Allow strongly typed custom fields to be added

[ajdaniel]

What problem does your feature request address?

I'd like custom fields on entities to be strongly typed natively in the SDK, without me needing to create my own supertypes like this

export type SubscriptionWithCustomFields = Subscription & {
  cf_myCustomField: string;
};

const result = await chargebee.subscription.retrieve(subscriptionId);
return result.subscription as SubscriptionWithCustomFields;

Describe the desired solution

No response

Alternatives considered

No response

Additional context

No response

[cb-alish]

Hi @ajdaniel, thanks for raising this — totally understand the pain here.

This is a bit tricky for us to support natively in the SDK. Since the SDK is designed to work across all Chargebee customers, and custom fields vary widely between accounts, it’s not feasible for us to strongly type these fields out of the box. Supporting every possible custom field combination would require generating customer-specific SDKs, which unfortunately isn’t scalable.

That said, we recognize this is a gap and appreciate you calling it out. For now, extending the types locally (as you’ve done) is the best approach we can recommend.