Add nullish coalescing helper

app/helpers/nu-co.js

@@ -0,0 +1,6 @@
+import { helper } from '@ember/component/helper';
+
+// Nullish coalescing operator (??)
+export default helper(function nuCo([arg1, arg2] /*, named*/) {
+  return arg1 ?? arg2;
+});

tests/integration/helpers/nu-co-test.js

@@ -0,0 +1,17 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'meiliadmin/tests/helpers';
+import { render } from '@ember/test-helpers';
+import { hbs } from 'ember-cli-htmlbars';
+
+module('Integration | Helper | nu-co', function (hooks) {
+  setupRenderingTest(hooks);
+
+  // TODO: Replace this with your real tests.
+  test('it renders', async function (assert) {
+    this.set('inputValue', '1234');
+
+    await render(hbs`{{nu-co this.inputValue}}`);
+
+    assert.dom(this.element).hasText('1234');
+  });
+});