TraitExpressionTraitsFn

2024-02-04 02:53:47 +01:00
parent ec914e0ffd
commit 781567a3bd
2 changed files with 10 additions and 6 deletions
--- a/src/TraitExpression.ts
+++ b/src/TraitExpression.ts
@@ -63,10 +63,12 @@ export class TraitExpression<
 export const emptyTraitExpression = new TraitExpression(TraitExpressionNullSuperclass, [] as const)

 interface PrependTraitSupertraitsFn extends Fn {
-    return: [
-        ...Call<TraitSupertraitsFn, this["arg0"]>,
-        this["arg0"],
-    ]
+    return: this["arg0"] extends Trait<any, any, any>
+        ? [
+            ...Call<TraitSupertraitsFn, this["arg0"]>,
+            this["arg0"],
+        ]
+        : never
 }
 export interface TraitExpressionTraitsFn extends Fn {
    return: this["arg0"] extends TraitExpression<any, infer Traits>