@ts-ignore or cast around more private/inconsistently available types

addon/addon-test-support/@ember/test-helpers/-internal/is-component.ts

@@ -1,5 +1,8 @@
 import type { ComponentLike } from '@glint/template';
 
+// @ts-ignore: types for this API is not consistently available (via transitive
+// deps) and we do not currently want to make it an explicit dependency. It
+// does, however, consistently work at runtime. :sigh:
 import { getInternalComponentManager as getComponentManager } from '@glimmer/manager';
 
 /**

addon/addon-test-support/@ember/test-helpers/settled.ts

@@ -1,4 +1,7 @@
 /* globals jQuery */
+// @ts-ignore: this is private API. This import will work Ember 5.1+ since it
+// "provides" this public API, but does not for earlier versions. As a result,
+// this type will be `any`.
 import { _backburner } from '@ember/runloop';
 import Ember from 'ember';
 

addon/addon-test-support/@ember/test-helpers/setup-context.ts

@@ -1,3 +1,6 @@
+// @ts-ignore: this is private API. This import will work Ember 5.1+ since it
+// "provides" this public API, but does not for earlier versions. As a result,
+// this type will be `any`.
 import { _backburner, run } from '@ember/runloop';
 import { set, setProperties, get, getProperties } from '@ember/object';
 import type { Resolver } from '@ember/owner';