Unsupported schema Error while applying Partial to Schema class about effect HOT 4 CLOSED

It raises an error because the Schema.Class API implicitly defines a transformation, specifically from:

Schema.Struct({
  id: Schema.Number,
  title: Schema.String,
  completed: Schema.Boolean
})

to Todo in this case, and transformations are not supported by Schema.partial.

However, this should work:

const UpdateTodoParams = Schema.partial(Schema.Struct(Todo.fields), { exact: true })

from effect.

Got it. Thank you for your reply.

Tried your solution and that stopped the error from occurring. However, I was expecting the non-unionised type, since exact: true is passed as an option to opt out of unionisation. However, types are still unionised. Am I missing something here?

from effect.

Do you have the exactOptionalPropertyTypes option enabled in your tsconfig?

from effect.

Yep that was the missing piece. Sorry, I overlooked the documentation here.

Thanks you very much for this really powerful and composable library.

from effect.