src/effect/EffectSchemaTraitExpression.ts

@@ -6,7 +6,6 @@ import { Extend } from "../util"
 
 
 export class EffectSchemaTraitExpression<
-    Superclass   extends S.Class<unknown, Fields, A, I, R, C, Inherited, Proto>,
     Fields       extends S.Struct.Fields,
     A,
     I,
@@ -14,11 +13,12 @@ export class EffectSchemaTraitExpression<
     C,
     Inherited    extends object,
     Proto,
+    Static       extends object,
 
     const Traits extends readonly Trait<any, any, any, any>[],
 > {
     constructor(
-        readonly superclass:  Superclass,
+        readonly superclass:  S.Class<unknown, Fields, A, I, R, C, Inherited, Proto> & Static,
         readonly traits:      Traits,
     ) {}
 
@@ -41,7 +41,10 @@ export class EffectSchemaTraitExpression<
         > &
 
         Simplify<
-            Extend<TraitTuple.MapImplStaticMembers<Traits>>
+            Extend<[
+                Static,
+                ...TraitTuple.MapImplStaticMembers<Traits>
+            ]>
         >
     ) {
         return this.traits.reduce(
@@ -51,9 +54,9 @@ export class EffectSchemaTraitExpression<
     }
 
 
-    staticImplements(_target: StaticImplements<TraitExpression<Superclass, Traits>>, _context: any) {}
+    staticImplements(_target: StaticImplements<TraitExpression<typeof this.superclass, Traits>>, _context: any) {}
 
     get staticImplementsStage2() {
-        return (_target: StaticImplements<TraitExpression<Superclass, Traits>>) => {}
+        return (_target: StaticImplements<TraitExpression<typeof this.superclass, Traits>>) => {}
     }
 }

src/effect/EffectSchemaTraitExpressionBuilder.ts

@@ -1,11 +1,12 @@
 import { Schema as S } from "@effect/schema"
 import { Simplify } from "effect/Types"
-import { Trait } from "../Trait"
+import { Trait, TraitTuple } from "../Trait"
 import { TraitExpression } from "../TraitExpression"
 import { TraitExpressionBuilder } from "../TraitExpressionBuilder"
 import { spreadSupertraits } from "../spreadSupertraits"
 import { traitsUnique } from "../traitsUnique"
-import { StaticMembers } from "../util"
+import { Extendable, StaticMembers } from "../util"
+import { EffectSchemaTraitExpression } from "./EffectSchemaTraitExpression"
 
 
 export class EffectSchemaInitialTraitExpressionBuilder {
@@ -124,6 +125,38 @@ export class EffectSchemaTraitExpressionBuilder<
             ]),
         )
     }
+
+
+    build(): (
+        Extendable<TraitTuple.MapAbstract<Traits>> extends false
+            ? "Type conflict between the traits abstract definitions."
+            : Extendable<TraitTuple.MapStaticAbstract<Traits>> extends false
+                ? "Type conflict between the traits static abstract definitions."
+                : Extendable<[
+                    InstanceType<typeof this.expressionSuperclass>,
+                    ...TraitTuple.MapImplInstance<Traits>,
+                ]> extends false
+                    ? "Type conflict between the traits implementation instance and/or the superclass instance."
+                    : Extendable<[
+                        Static,
+                        ...TraitTuple.MapImplStaticMembers<Traits>,
+                    ]> extends false
+                        ? "Type conflict between the traits implementation static members and/or the superclass static members."
+                        : EffectSchemaTraitExpression<
+                            Fields,
+                            A,
+                            I,
+                            R,
+                            C,
+                            Inherited,
+                            Proto,
+                            Static,
+
+                            Traits
+                        >
+    ) {
+        return new EffectSchemaTraitExpression(this.expressionSuperclass, this.expressionTraits) as any
+    }
 }
 
 

src/effect/tests.ts

@@ -1,30 +1,27 @@
 import { Schema as S } from "@effect/schema"
 import { Implements } from "../TraitExpression"
-import { expression } from "../TraitExpressionBuilder"
-import { extendsEffectSchemaExpression } from "../effect"
+import { effectSchemaExpression } from "./EffectSchemaTraitExpressionBuilder"
 
 
-const UserSchema = S.Class<unknown>("User")({
-    id: S.BigIntFromSelf
+const userExp = effectSchemaExpression
+    .class("User", {
+        id:    S.BigIntFromSelf,
+        role:  S.Union(S.Literal("User"), S.Literal("Admin")),
     })
-
-const userExp = expression
-    .extends(UserSchema)
     .build()
 
 @userExp.staticImplements
-class User extends extendsEffectSchemaExpression(userExp)<User>() implements Implements<typeof userExp> {
+class User extends userExp.extends<User>() implements Implements<typeof userExp> {
     static aStaticMethodThatShouldBeInherited() {}
 }
 
 
-const AdminSchema = User.extend<unknown>("Admin")({
+const adminExp = effectSchemaExpression
+    .extends(User, "User", {
+        role: S.Literal("Admin")
     })
-
-const adminExp = expression
-    .extends(AdminSchema)
     .build()
 
 @adminExp.staticImplements
-class Admin extends extendsEffectSchemaExpression(adminExp)<Admin>() implements Implements<typeof adminExp> {
+class Admin extends adminExp.extends<Admin>() implements Implements<typeof adminExp> {
 }