toNullableFromErrUnwrap E if input is Err(E). Otherwise, return null. function toNullableFromErr<E>(input: Result<unknown, E>): Nullable<E>;§toNullableFromErr<E>(input: Result<unknown, E>): Nullable<E>[src]§Type Parameters§E[src]§Parameters§input: Result<unknown, E>[src]§Return Type§Nullable<E>[src]