expressesFirst

src/TraitExpressionBuilder.ts

@@ -105,6 +105,32 @@ export class TraitExpressionBuilder<
         )
     }
 
+    expressesFirst<
+        const T extends Trait<
+            TraitExpression<
+                typeof TraitExpression.NullSuperclass,
+                Trait<any, any, any, any>[]
+            >,
+            any,
+            any,
+            any
+        >[]
+    >(
+        ...traits: T
+    ) {
+        return new TraitExpressionBuilder(
+            this.expressionSuperclass,
+
+            uniq([
+                ...traits.flatMap(trait => [
+                    ...trait.superExpression.traits,
+                    trait,
+                ]),
+                ...this.expressionTraits,
+            ]) as TraitsUniq<[...SpreadSupertraits<T>, ...Traits]>,
+        )
+    }
+
     build() {
         return new TraitExpression(
             this.expressionSuperclass,