Option type

src/schema/effect/option.ts

@@ -0,0 +1,21 @@
+import { Option } from "effect"
+import { identity } from "lodash-es"
+import { z } from "zod"
+
+
+export const option = {
+    some: <S extends z.ZodSchema>(schema: S) => z
+        .custom(v => Option.isOption(v) && Option.isSome(v), "Not an Option")
+        .pipe(z.object({ value: schema }).passthrough())
+        .transform<Option.Some<z.output<S>>>(identity),
+
+    none: <S extends z.ZodSchema | unknown = unknown>(_schema?: S) =>
+        z.custom<Option.None<
+            S extends z.ZodSchema
+                ? z.output<S>
+                : unknown
+        >>(v => Option.isOption(v) && Option.isNone(v), "Not an Option"),
+
+    option: <S extends z.ZodSchema>(schema: S) =>
+        z.union([option.some(schema), option.none(schema)]),
+} as const