Function optionalOption

packages/infra/src/SQL/Model.ts:261–270

(schema: S)

 * @category optional
 */
export const optionalOption = <S extends Schema.Top>(schema: S): optionalOption<S> =>
  Schema.optionalKey(Schema.NullOr(schema)).pipe(
    Schema.decodeTo(
      Schema.Option(Schema.toType(schema)),
      Transformation.transformOptional<Option.Option<S["Type"]>, S["Type"] | null>({
        decode: (oe) => oe.pipe(Option.filter(Predicate.isNotNull), Option.some),
        encode: Option.flatten
      }) as any
    )
  )

/**
 * Convert a field to one that is optional for all variants.