src/trait.ts

@@ -3,7 +3,7 @@ import { AbstractClass, Class, Opaque } from "type-fest"
 import { StaticMembers } from "./util"
 
 
-type AddAbstractToImplClass<
+type AddAbstractToImpl<
     Impl     extends Class<object, []>,
     Abstract extends object,
 > = (
@@ -14,26 +14,15 @@ type AddAbstractToImplClass<
     StaticMembers<Impl>
 )
 
-type RemoveAbstractFromImplInstance<
-    ImplInstanceWithAbstractMembers extends AbstractMembers,
-    AbstractMembers                 extends object,
-> = (
-    Omit<ImplInstanceWithAbstractMembers, keyof AbstractMembers>
-)
-
-type RemoveAbstractFromImplClass<
-    ImplWithAbstractMembers extends Class<AbstractMembers, []>,
-    AbstractMembers         extends object,
+type RemoveAbstractFromImpl<
+    ImplWithAbstract extends Class<Abstract, []>,
+    Abstract         extends object,
 > = (
     Class<
-        RemoveAbstractFromImplInstance<
-            InstanceType<ImplWithAbstractMembers>,
-            AbstractMembers
-        >,
-
-        ConstructorParameters<ImplWithAbstractMembers>
+        Omit<InstanceType<ImplWithAbstract>, keyof Abstract>,
+        ConstructorParameters<ImplWithAbstract>
     > &
-    StaticMembers<ImplWithAbstractMembers>
+    StaticMembers<ImplWithAbstract>
 )
 
 
@@ -46,7 +35,7 @@ export type Trait<
     Opaque<{
         readonly apply: TraitApplier<
             Abstract,
-            AddAbstractToImplClass<Impl, Abstract>
+            AddAbstractToImpl<Impl, Abstract>
         >
     }, TraitTag>
 )
@@ -83,7 +72,7 @@ export interface TraitImplInstanceFn extends Fn {
 
 export type TraitClass<T> = (
     T extends Trait<infer Abstract, infer Impl>
-        ? AddAbstractToImplClass<Impl, Abstract>
+        ? AddAbstractToImpl<Impl, Abstract>
         : never
 )
 
@@ -94,7 +83,7 @@ export interface TraitClassFn extends Fn {
 export type TraitInstance<T> = (
     T extends Trait<infer Abstract, infer Impl>
         ? InstanceType<
-            AddAbstractToImplClass<Impl, Abstract>
+            AddAbstractToImpl<Impl, Abstract>
         >
         : never
 )
@@ -122,7 +111,7 @@ export function trait<
         apply: TraitApplier<Abstract, ImplWithAbstract>
     ) => Trait<
         Abstract,
-        RemoveAbstractFromImplClass<ImplWithAbstract, Abstract>
+        RemoveAbstractFromImpl<ImplWithAbstract, Abstract>
     >
 ) {
     return apply => ({ apply }) as any