Create public import for uniqueId helper

packages/@ember/-internals/glimmer/index.ts

@@ -324,3 +324,4 @@ export {
   setComponentManager,
 } from './lib/utils/managers';
 export { isSerializationFirstNode } from './lib/utils/serialization-first-node-helpers';
+export { default as uniqueId } from './lib/helpers/unique-id';

packages/@ember/-internals/glimmer/tests/integration/helpers/unique-id-test.js

@@ -1,8 +1,35 @@
-import { RenderingTestCase, strip, moduleFor, runTask } from 'internal-test-helpers';
+import {
+  AbstractTestCase,
+  RenderingTestCase,
+  strip,
+  moduleFor,
+  runTask,
+} from 'internal-test-helpers';
 import { setProperties } from '@ember/object';
+import { uniqueId, invokeHelper } from '@ember/helper';
 import { EMBER_UNIQUE_ID_HELPER } from '@ember/canary-features';
+import { getValue } from '@glimmer/validator';
 
 if (EMBER_UNIQUE_ID_HELPER) {
+  moduleFor(
+    'Helpers test: {{unique-id}} JS',
+    class JSRenderingTest extends AbstractTestCase {
+      constructor(assert) {
+        super(assert);
+        this.assert = assert;
+      }
+      ['@test it can be invoked as a JS function']() {
+        let first = getValue(invokeHelper({}, uniqueId()));
+        let second = getValue(invokeHelper({}, uniqueId()));
+
+        this.assert.notStrictEqual(
+          first,
+          second,
+          `different invocations of uniqueId should produce different values`
+        );
+      }
+    }
+  );
   moduleFor(
     'Helpers test: {{unique-id}}',
     class extends RenderingTestCase {

packages/@ember/helper/index.ts

@@ -314,3 +314,5 @@
 
 export { setHelperManager, helperCapabilities as capabilities } from '@glimmer/manager';
 export { invokeHelper, hash, array, concat, get, fn } from '@glimmer/runtime';
+
+export { uniqueId } from '@ember/-internals/glimmer';

packages/ember/tests/reexports_test.js

@@ -169,6 +169,7 @@ let allExports = [
   ['_hash', '@ember/helper', 'hash'],
   ['_get', '@ember/helper', 'get'],
   ['_concat', '@ember/helper', 'concat'],
+  ['_uniqueId', '@ember/helper', 'uniqueId'],
 
   // @ember/object
   ['Object', '@ember/object', 'default'],