Do not use global ember -- internalize template resolution cache

addon/addon/index.js

@@ -1,11 +1,13 @@
 /* globals requirejs, require */
 
-import Ember from 'ember';
 import { assert, deprecate, warn } from '@ember/debug';
 import EmberObject from '@ember/object';
 import { dasherize, classify, underscore } from './string';
 import { DEBUG } from '@glimmer/env';
 import classFactory from './utils/class-factory';
+import { getOwner } from '@ember/owner';
+
+import { TEMPLATES } from './template-cache';
 
 if (typeof requirejs.entries === 'undefined') {
   requirejs.entries = requirejs._eak_seen;
@@ -295,7 +297,7 @@ class Resolver extends EmberObject {
   resolveTemplate(parsedName) {
     let resolved = this.resolveOther(parsedName);
     if (resolved == null) {
-      resolved = Ember.TEMPLATES[parsedName.fullNameWithoutType];
+      resolved = TEMPLATES[parsedName.fullNameWithoutType];
     }
     return resolved;
   }
@@ -459,7 +461,9 @@ class Resolver extends EmberObject {
 
   // only needed until 1.6.0-beta.2 can be required
   _logLookup(found, parsedName, description) {
-    if (!Ember.ENV.LOG_MODULE_RESOLVER && !parsedName.root.LOG_RESOLVER) {
+    let owner = getOwner(this);
+    let env = owner?.resolveRegistration('config:environment');
+    if (!env?.LOG_MODULE_RESOLVER && !parsedName.root.LOG_RESOLVER) {
       return;
     }
 

addon/addon/template-cache.js

@@ -0,0 +1,30 @@
+/**
+ * Originally: https://github.com/emberjs/ember.js/blob/28444d536fa20debef2a67e2f18c5eb11113a4b5/packages/%40ember/-internals/glimmer/lib/template_registry.ts#L9
+ *
+ * import { TEMPLATES } from 'ember';
+ *
+ * Removed for RFC 1003
+ */
+export let TEMPLATES = {};
+
+export function setTemplates(templates) {
+  TEMPLATES = templates;
+}
+
+export function getTemplates() {
+  return TEMPLATES;
+}
+
+export function getTemplate(name) {
+  if (Object.prototype.hasOwnProperty.call(TEMPLATES, name)) {
+    return TEMPLATES[name];
+  }
+}
+
+export function hasTemplate(name) {
+  return Object.prototype.hasOwnProperty.call(TEMPLATES, name);
+}
+
+export function setTemplate(name, template) {
+  return (TEMPLATES[name] = template);
+}

test-app/tests/unit/resolvers/classic/basic-test.js

@@ -3,6 +3,7 @@
 import Ember from 'ember';
 import { module, test } from 'qunit';
 import Resolver, { ModuleRegistry } from 'ember-resolver';
+import { TEMPLATES } from 'ember-resolver/template-cache';
 
 let originalConsoleInfo, logCalls, resolver, loader;
 
@@ -456,7 +457,7 @@ test('can lookup templates with mixed naming moduleName', function (assert) {
 });
 
 test('can lookup templates via Ember.TEMPLATES', function (assert) {
-  Ember.TEMPLATES['application'] = function () {
+  TEMPLATES['application'] = function () {
     return '<h1>herp</h1>';
   };
 
@@ -695,7 +696,9 @@ test('logs lookups when logging is enabled', function (assert) {
     return 'is logged';
   });
 
-  Ember.ENV.LOG_MODULE_RESOLVER = true;
+  this.owner.resolveRegistration(
+    'config:environment'
+  ).LOG_MODULE_RESOLVER = true;
 
   resolver.resolve('fruit:orange');