Typescript error selecting an optional field.

[thruflo]

I have a collection defined with a zod schema with inserted_at: z.date().optional().

If I try to select this field in a live query:

query
  .from({ thread: threadCollection })
  .select(({ thread }) => ({
    inserted_at: thread.inserted_at
  }))

I get a Typescript error:

Type 'RefProxy<Date | undefined> | undefined' is not assignable to type 'RefProxy<any> | RefProxyFor<any> | BasicExpression | Aggregate<any>'.
  Type 'undefined' is not assignable to type 'RefProxy<any> | RefProxyFor<any> | BasicExpression | Aggregate<any>'.

50           inserted_at: thread.inserted_at
             ~~~~~~~~~~~

This may relate to #299.

[samwillis]

Yep related to #299 but needs separate tests so lets keep open too.

[samwillis]

I believe this is related to how these two types are different:

{
  inserted_at: Date | undefined // this works
  inserted_at?: Date // Seems to cause issues
}

[thruflo]

An extract of my zod schema, just for reference:

import * as z from 'zod/v4'

export const threadSchema = z.object({
  inserted_at: z.date().optional()
})

[thruflo]

Note that it's possible to workaround with:

query
  .from({ thread: threadCollection })
  .select(({ thread }) => ({
    inserted_at: thread.inserted_at!
  }))

This strips the outer undefined from RefProxy<Date | undefined> | undefined, leaving the actual type correctly as RefProxy<Date | undefined>.

Clearly would be nice for the library to fix this though.