TraitExpression work

src/TraitExpression.ts

@@ -1,8 +1,8 @@
 import { Fn, Pipe, Tuples } from "hotscript"
 import { AbstractClass, Class, Simplify } from "type-fest"
-import { Trait, TraitInstance, Traits } from "./Trait"
+import { Trait, TraitInstance, TraitStaticMembers, Traits } from "./Trait"
 import { TraitBuilder } from "./TraitBuilder"
-import { ExtendFn, ExtendPlain, SimplifyFn, StaticMembersFn } from "./util"
+import { ExtendFn, ExtendPlain, SimplifyFn, StaticMembers, StaticMembersFn } from "./util"
 
 
 export class TraitExpression<
@@ -148,37 +148,35 @@ export type TraitExpressionConcreteClass<
 export type TraitExpressionInstance<
     Exp extends TraitExpression<any, Trait<any, any, any, any>[]>
 > = (
-    // Pipe<TraitExpression.Traits<Exp>, [
-    //     Tuples.Map<Trait.OwnInstanceFn>,                   // Map all the traits to their instance representation
-    //     Tuples.Prepend<                                    // Add the instance of the superclass at the top of the list
-    //         InstanceType<TraitExpression.Superclass<Exp>>
-    //     >,
-    //     ExtendFn,                                          // Reduce to a single object that extends all the objects in the list
-    //     SimplifyFn,                                        // Make readable for IDEs
-    // ]>
     Simplify<
         ExtendPlain<[
             InstanceType<TraitExpression.Superclass<Exp>>,
-            ...MapTraitsInstance<
+            ...MapTraitsInstance<TraitExpression.Traits<Exp>>,
-                TraitExpression.Traits<Exp>
-            >,
         ]>
     >
 )
-type MapTraitsInstance<T extends Trait<any, any, any, any>[]> = {
+type MapTraitsInstance<T> = {
     [K in keyof T]: K extends keyof []
         ? T[K]
-        : TraitInstance<T[K]>
+        : T[K] extends Trait<any, any, any, any>
+            ? TraitInstance<T[K]>
+            : never
 }
 
 export type TraitExpressionStaticMembers<
     Exp extends TraitExpression<any, Trait<any, any, any, any>[]>
 > = (
-    Pipe<TraitExpression.Traits<Exp>, [
+    Simplify<
-        Tuples.Map<Trait.OwnClassFn>,                     // Map all the traits to their class representation
+        ExtendPlain<[
-        Tuples.Prepend<TraitExpression.Superclass<Exp>>,  // Add the superclass at the top of the list
+            StaticMembers<TraitExpression.Superclass<Exp>>,
-        Tuples.Map<StaticMembersFn>,                      // Map all the classes to an object containing their static members
+            ...MapTraitsStaticMembers<TraitExpression.Traits<Exp>>,
-        ExtendFn,                                         // Reduce to a single object that extends all the objects in the list
+        ]>
-        SimplifyFn,                                       // Make readable for IDEs
+    >
-    ]>
 )
+type MapTraitsStaticMembers<T> = {
+    [K in keyof T]: K extends keyof []
+        ? T[K]
+        : T[K] extends Trait<any, any, any, any>
+            ? TraitStaticMembers<T[K]>
+            : never
+}

src/tests.ts

@@ -1,6 +1,6 @@
 import { TraitClass } from "./Trait"
 import { trait } from "./TraitBuilder"
-import { Implements, ImplementsStatic } from "./TraitExpression"
+import { Implements, ImplementsStatic, TraitExpressionClass } from "./TraitExpression"
 import { expression } from "./TraitExpressionBuilder"
 
 
@@ -70,6 +70,7 @@ const exp = expression
 
 type Abs = Implements<typeof exp>
 type AbsStatic = ImplementsStatic<typeof exp>
+type ExpClass = TraitExpressionClass<typeof exp>
 
 @exp.implementsStatic
 class User extends exp.extends implements Implements<typeof exp> {