21 replies

Issues with Recursive Schemas and Class Interface

I'd like to get feedback on recursive schemas with the class interface.
This doesn't work:

class ItemBase extends S.Class({
  value: S.number,
  children: S.array(S.lazy(() => Item.schema()))
}) {}

class ItemBase extends S.Class({
  value: S.number,
  children: S.array(S.lazy(() => Item.schema()))
}) {}

Because

Property 'schema' does not exist on 'typeof Item'.

Property 'schema' does not exist on 'typeof Item'.

Attempting

(Item as any)

(Item as any)

, and then passing the type to lazy like this:

class Item2 extends S.Class({
  value: S.number,
  children: S.array(S.lazy<Item2>(() => (Item2 as any).schema()))
}) {}

class Item2 extends S.Class({
  value: S.number,
  children: S.array(S.lazy<Item2>(() => (Item2 as any).schema()))
}) {}

Results in:

'Item2' is referenced directly or indirectly in its own base expression.

'Item2' is referenced directly or indirectly in its own base expression.

Ignoring the error with

// @ts-ignore

// @ts-ignore

ruins type inference.