package.json

@@ -18,6 +18,16 @@
         "types": "./dist/lib.d.cts",
         "default": "./dist/lib.cjs"
       }
+    },
+    "./util": {
+      "import": {
+        "types": "./dist/util.d.mts",
+        "default": "./dist/util.mjs"
+      },
+      "require": {
+        "types": "./dist/util.d.cts",
+        "default": "./dist/util.cjs"
+      }
     }
   },
   "scripts": {

rollup.config.ts

@@ -5,17 +5,20 @@ import ts from "rollup-plugin-ts"
 import pkg from "./package.json" assert { type: "json" }
 
 
-export default defineConfig({
-    input: "src/lib.ts",
+export const createBundleConfig = (
+    input:  string,
+    name:   keyof typeof pkg.exports,
+) => (
+    defineConfig({
+        input,
 
         output: [
             {
-            file:    pkg.exports["."].import.default,
+                file:    pkg.exports[name].import.default,
                 format:  "esm",
             },
-
             {
-            file:    pkg.exports["."].require.default,
+                file:    pkg.exports[name].require.default,
                 format:  "cjs",
             },
         ],
@@ -32,3 +35,10 @@ export default defineConfig({
             }),
         ],
     })
+)
+
+
+export default [
+    createBundleConfig("src/lib.ts", "."),
+    createBundleConfig("src/util/lib.ts", "./util"),
+]

src/lib.ts

@@ -1,5 +1,6 @@
 export {
     abstract, expression, trait,
+    type Implements,
     type Trait,
     type TraitExpression
 } from "."

src/util/lib.ts

@@ -0,0 +1,6 @@
+export {
+    Extend,
+    ExtendFn,
+    Extendable,
+    ExtendableFn
+} from "."