Merge pull request #20000 from cafreeman/cfreeman/expose-render-settled

export `renderSettled` via `@ember/renderer` package

packages/@ember/renderer/index.ts

@@ -0,0 +1,21 @@
+/**
+  @module @ember/renderer
+  @public
+*/
+
+/**
+ * @class Renderer
+ * @public
+ */
+
+/**
+  Returns a promise which will resolve when rendering has settled. Settled in
+  this context is defined as when all of the tags in use are "current" (e.g.
+  `renderers.every(r => r._isValid())`). When this is checked at the _end_ of
+  the run loop, this essentially guarantees that all rendering is completed.
+
+  @method renderSettled
+  @return {Promise<void>} a promise which fulfills when rendering has settled
+  @public
+*/
+export { renderSettled } from '@ember/-internals/glimmer';

tests/docs/expected.js

@@ -420,6 +420,7 @@ module.exports = {
     'removeObjects',
     'removeObserver',
     'removeTestHelpers',
+    'renderSettled',
     'reopen',
     'reopenClass',
     'replace',