Yoga.Fetch.Om.ReadOptional

readOptional :: forall @name ty r. IsSymbol name => Record r -> Maybe ty

class ReadPartialQuery :: RowList Type -> Row Type -> Constraintclass ReadPartialQuery (rl :: RowList Type) (queryParams :: Row Type) | rl -> queryParams where

Read query params from a potentially-partial record. Walks the query params RowList: Maybe ty → read with undefined-awareness (present → Just, absent → Nothing) bare ty → read directly (required, always present)

Members

• readPartialQuery :: forall r. Record r -> Record queryParams

Instances

• ReadPartialQuery Nil ()
• (IsSymbol name, ReadPartialQuery tail tailQuery, Cons name (Maybe ty) tailQuery queryParams, Lacks name tailQuery) => ReadPartialQuery (Cons name (Maybe ty) tail) queryParams
• (IsSymbol name, ReadPartialQuery tail tailQuery, Cons name ty tailQuery queryParams, Lacks name tailQuery) => ReadPartialQuery (Cons name ty tail) queryParams