src/ZodSchemaClass.ts

@@ -1,5 +1,5 @@
 import { Trait, TraitExpression, TraitExpressionBuilder } from "@thilawyn/traitify-ts"
-import { AbstractClass } from "type-fest"
+import { AbstractClass, IsEqual } from "type-fest"
 import { JsonifiableObject } from "type-fest/source/jsonifiable"
 import { z } from "zod"
 import { ZodSchemaAbstractClass } from "./shapes/ZodSchemaClass"
@@ -10,6 +10,38 @@ import { JsonifiableZodSchemaObject } from "./traits/JsonifiableZodSchemaObject"
 import { StaticMembers } from "./util"
 
 
+type SpreadSupertraits<Traits> = (
+    Traits extends [
+        infer El extends Trait<any, any, any, any>,
+        ...infer Rest,
+    ]
+        ? [
+            ...Trait.Supertraits<El>,
+            El,
+            ...SpreadSupertraits<Rest>,
+        ]
+        : []
+)
+
+type TraitsUniq<Traits> = (
+    Traits extends [
+        ...infer Rest,
+        infer El extends Trait<any, any, any, any>,
+    ]
+        ? IsTraitInTupleFromRight<Rest, El> extends true
+            ? TraitsUniq<Rest>
+            : [...TraitsUniq<Rest>, El]
+        : []
+)
+type IsTraitInTupleFromRight<Traits, T> = (
+    Traits extends [...infer Rest, infer El]
+        ? IsEqual<El, T> extends true
+            ? true
+            : IsTraitInTupleFromRight<Rest, T>
+        : false
+)
+
+
 export class ZodSchemaClassBuilder<
     Superclass   extends AbstractClass<object>,
     const Traits extends Trait<any, any, any, any>[],
@@ -28,6 +60,25 @@ extends TraitExpressionBuilder<Superclass, Traits> {
         )
     }
 
+    expresses<
+        const T extends Trait<
+            TraitExpression<
+                typeof TraitExpression.NullSuperclass,
+                Trait<any, any, any, any>[]
+            >,
+            any,
+            any,
+            any
+        >[]
+    >(
+        ...traits: T
+    ): TraitExpressionBuilder<
+        Superclass,
+        TraitsUniq<[...Traits, ...SpreadSupertraits<T>]>
+    > {
+        return super.expresses(...traits)
+    }
+
     schema<
         Superclass        extends AbstractClass<object, []> & { schema?: never, defaultValues?: never },