TraitExpression work

src/TraitBuilder.ts

@@ -1,4 +1,4 @@
-import { AbstractClass, Class, Simplify } from "type-fest"
+import { AbstractClass, Simplify } from "type-fest"
 import { Trait, Traits } from "./Trait"
 import { TraitExpression } from "./TraitExpression"
 import { ExtendPlain, StaticMembers } from "./util"
@@ -37,7 +37,7 @@ export class TraitBuilder<
     >,
     Abstract        extends object,
     StaticAbstract  extends object,
-    ImplClass       extends Class<object, []>,
+    ImplClass       extends AbstractClass<object, []>,
 > {
     constructor(
         private readonly traitSuperExpression:  SuperExpression,
@@ -85,7 +85,7 @@ export class TraitBuilder<
             this.traitStaticAbstract,
 
             apply as unknown as (Super: AbstractClass<object>) => (
-                Class<  // TODO: use abstract class instead
+                AbstractClass<
                     Simplify<
                         Omit<
                             InstanceType<ImplClassWithAbstract>,