Add exports to compat's package.json & make builder export in ESM style & add ts6 to local types tests

Author: slowcheetah

packages/core-js-builder/index.d.ts

@@ -30,4 +30,4 @@ type Options = Pick<CompatOptions, "exclude" | "modules" | "targets"> & {
 
 declare function builder(options?: Options): Promise<string>;
 
-export = builder;
+export default builder;

packages/core-js-compat/package.json

@@ -28,6 +28,28 @@
   "sideEffects": false,
   "main": "index.js",
   "types": "index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./index.d.ts",
+      "default": "./index.js"
+    },
+    "./index.js": {
+      "types": "./index.d.ts",
+      "default": "./index.js"
+    },
+    "./compat": {
+      "types": "./compat.d.ts",
+      "default": "./compat.js"
+    },
+    "./get-entries-list-for-target-version": {
+      "types": "./get-entries-list-for-target-version.d.ts",
+      "default": "./get-entries-list-for-target-version.js"
+    },
+    "./get-modules-list-for-target-version": {
+      "types": "./get-modules-list-for-target-version.d.ts",
+      "default": "./get-modules-list-for-target-version.js"
+    }
+  },
   "dependencies": {
     "browserslist": "^4.28.1"
   }

tests/type-definitions/runner.mjs

@@ -24,6 +24,7 @@ const TYPE_SCRIPT_VERSIONS = ALL_TESTS ? [
   // '5.3',
   // '5.2',
 ] : [
+  '6.0.0-dev.20260208',
   '5.9',
   '5.6',
 ];