[Backport 8.x] Fix ECMAScript import (#2476)

Co-authored-by: Josh Mock <joshua.mock@elastic.co>

.github/workflows/nodejs.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [18.x, 20.x, 22.x, 23.x]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
@@ -57,6 +57,10 @@ jobs:
         run: |
           npm run test:unit
 
+      - name: ECMAScript module test
+        run: |
+          npm run test:esm
+
   license:
     name: License check
     runs-on: ubuntu-latest
@@ -110,3 +114,7 @@ jobs:
       - name: Unit test
         run: |
           bun run test:unit-bun
+
+      - name: ECMAScript module test
+        run: |
+          bun run test:esm

package.json

@@ -6,12 +6,15 @@
   "main": "./index.js",
   "types": "index.d.ts",
   "exports": {
-    "require": "./index.js"
+    "require": "./index.js",
+    "import": "./index.js",
+    "types": "./index.d.ts"
   },
   "scripts": {
     "test": "npm run build && npm run lint && tap",
     "test:unit": "npm run build && tap",
     "test:unit-bun": "bun run build && bunx tap",
+    "test:esm": "npm run build && cd test/esm/ && npm install && node test-import.mjs",
     "test:coverage-100": "npm run build && tap --coverage --100",
     "test:coverage-report": "npm run build && tap --coverage && nyc report --reporter=text-lcov > coverage.lcov",
     "test:coverage-ui": "npm run build && tap --coverage --coverage-report=html",

test/esm/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "esm",
+  "version": "1.0.0",
+  "dependencies": {
+    "@elastic/elasticsearch": "file:../.."
+  }
+}

test/esm/test-import.mjs

@@ -0,0 +1,28 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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.
+ */
+
+import { Client } from '@elastic/elasticsearch'
+
+new Client({
+  node: 'http://localhost:9200',
+  auth: {
+    username: 'elastic',
+    password: 'changeme',
+  }
+})