Add ESM support and re-export CJS entry point in js-host-api

src/js-host-api/lib.mjs

@@ -0,0 +1,40 @@
+/*
+Copyright 2026  The Hyperlight Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// ESM re-export of the CJS entry point (lib.js).
+// This enables `import { SandboxBuilder } from '@hyperlight-dev/js-host-api'`
+// while preserving the error-enrichment wrapper from lib.js.
+
+import native from './lib.js';
+
+export const {
+    HostModule,
+    HostModuleWrapper,
+    InterruptHandle,
+    InterruptHandleWrapper,
+    JSSandbox,
+    JSSandboxWrapper,
+    LoadedJSSandbox,
+    LoadedJSSandboxWrapper,
+    ProtoJSSandbox,
+    ProtoJSSandboxWrapper,
+    SandboxBuilder,
+    SandboxBuilderWrapper,
+    Snapshot,
+    SnapshotWrapper,
+} = native;
+
+export default native;

src/js-host-api/package.json

@@ -3,7 +3,20 @@
   "version": "0.2.0",
   "description": "Node.js API bindings for Hyperlight JS",
   "main": "lib.js",
+  "module": "lib.mjs",
   "types": "index.d.ts",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./index.d.ts",
+        "default": "./lib.mjs"
+      },
+      "require": {
+        "types": "./index.d.ts",
+        "default": "./lib.js"
+      }
+    }
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/hyperlight-dev/hyperlight-js.git"