diff --git a/packages/@ember/-internals/glimmer/lib/component-managers/curly.ts b/packages/@ember/-internals/glimmer/lib/component-managers/curly.ts
index 585a9b8d63d..cba02847d4b 100644
--- a/packages/@ember/-internals/glimmer/lib/component-managers/curly.ts
+++ b/packages/@ember/-internals/glimmer/lib/component-managers/curly.ts
@@ -73,7 +73,7 @@ export const DIRTY_TAG = Symbol('DIRTY_TAG');
 export const IS_DISPATCHING_ATTRS = Symbol('IS_DISPATCHING_ATTRS');
 export const BOUNDS = Symbol('BOUNDS');
 
-const EMBER_VIEW_REF = createPrimitiveRef('ember-view');
+const EMBER_VIEW_REF = /* @__PURE__ */ createPrimitiveRef('ember-view');
 
 function aliasIdToElementId(args: VMArguments, props: any) {
   if (args.named.has('id')) {
diff --git a/packages/@ember/-internals/glimmer/lib/component.ts b/packages/@ember/-internals/glimmer/lib/component.ts
index f61e446f829..3d3c29a55c6 100644
--- a/packages/@ember/-internals/glimmer/lib/component.ts
+++ b/packages/@ember/-internals/glimmer/lib/component.ts
@@ -796,7 +796,7 @@ interface Component<S = unknown>
   extends CoreView, TargetActionSupport, ActionSupport, ComponentMethods {}
 
 class Component<S = unknown>
-  extends CoreView.extend(
+  extends /* @__PURE__ */ CoreView.extend(
     TargetActionSupport,
     ActionSupport,
     {
diff --git a/packages/@ember/-internals/glimmer/lib/helpers/internal-helper.ts b/packages/@ember/-internals/glimmer/lib/helpers/internal-helper.ts
index c11617194c9..ff2d690c269 100644
--- a/packages/@ember/-internals/glimmer/lib/helpers/internal-helper.ts
+++ b/packages/@ember/-internals/glimmer/lib/helpers/internal-helper.ts
@@ -2,6 +2,7 @@ import type { InternalOwner } from '@ember/-internals/owner';
 import type { Helper, HelperDefinitionState } from '@glimmer/interfaces';
 import { setInternalHelperManager } from '@glimmer/manager/lib/internal/api';
 
+/* @__NO_SIDE_EFFECTS__ */
 export function internalHelper(helper: Helper<InternalOwner>): HelperDefinitionState {
   return setInternalHelperManager(helper, {});
 }
diff --git a/packages/@ember/-internals/runtime/lib/mixins/-proxy.ts b/packages/@ember/-internals/runtime/lib/mixins/-proxy.ts
index ddb31a6c18d..83fe90983e7 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/-proxy.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/-proxy.ts
@@ -90,7 +90,7 @@ interface ProxyMixin<T = unknown> {
   setUnknownProperty<V>(key: string, value: V): V;
 }
 
-const ProxyMixin = Mixin.create({
+const ProxyMixin = /* @__PURE__ */ Mixin.create({
   /**
     The object whose properties will be forwarded.
 
diff --git a/packages/@ember/-internals/runtime/lib/mixins/action_handler.ts b/packages/@ember/-internals/runtime/lib/mixins/action_handler.ts
index bab591600ee..d903fd60512 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/action_handler.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/action_handler.ts
@@ -21,7 +21,7 @@ interface ActionHandler {
   actions?: Record<string, (...args: any[]) => unknown>;
   send(actionName: string, ...args: unknown[]): void;
 }
-const ActionHandler = Mixin.create({
+const ActionHandler = /* @__PURE__ */ Mixin.create({
   mergedProperties: ['actions'],
 
   /**
diff --git a/packages/@ember/-internals/runtime/lib/mixins/comparable.ts b/packages/@ember/-internals/runtime/lib/mixins/comparable.ts
index 451fd1d4885..33ed751f47e 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/comparable.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/comparable.ts
@@ -18,7 +18,7 @@ import Mixin from '@ember/object/mixin';
 interface Comparable {
   compare: ((a: unknown, b: unknown) => -1 | 0 | 1) | null;
 }
-const Comparable = Mixin.create({
+const Comparable = /* @__PURE__ */ Mixin.create({
   /**
     __Required.__ You must implement this method to apply this mixin.
 
diff --git a/packages/@ember/-internals/runtime/lib/mixins/container_proxy.ts b/packages/@ember/-internals/runtime/lib/mixins/container_proxy.ts
index 9b9a870a7c9..1ab990a2b74 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/container_proxy.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/container_proxy.ts
@@ -21,7 +21,7 @@ interface ContainerProxyMixin extends ContainerProxy {
   /** @internal */
   __container__: Container;
 }
-const ContainerProxyMixin = Mixin.create({
+const ContainerProxyMixin = /* @__PURE__ */ Mixin.create({
   /**
    The container stores state.
 
diff --git a/packages/@ember/-internals/runtime/lib/mixins/registry_proxy.ts b/packages/@ember/-internals/runtime/lib/mixins/registry_proxy.ts
index 600b2bf62f2..34378909082 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/registry_proxy.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/registry_proxy.ts
@@ -21,7 +21,7 @@ interface RegistryProxyMixin extends RegistryProxy {
   /** @internal */
   __registry__: Registry;
 }
-const RegistryProxyMixin = Mixin.create({
+const RegistryProxyMixin = /* @__PURE__ */ Mixin.create({
   __registry__: null,
 
   resolveRegistration(fullName: string) {
diff --git a/packages/@ember/-internals/runtime/lib/mixins/target_action_support.ts b/packages/@ember/-internals/runtime/lib/mixins/target_action_support.ts
index d5a7d79229f..dc3b677ae12 100644
--- a/packages/@ember/-internals/runtime/lib/mixins/target_action_support.ts
+++ b/packages/@ember/-internals/runtime/lib/mixins/target_action_support.ts
@@ -31,7 +31,7 @@ interface TargetActionSupport {
   /** @internal */
   _target?: unknown;
 }
-const TargetActionSupport = Mixin.create({
+const TargetActionSupport = /* @__PURE__ */ Mixin.create({
   target: null,
   action: null,
   actionContext: null,
diff --git a/packages/@ember/-internals/string/index.ts b/packages/@ember/-internals/string/index.ts
index 642ae8b687e..e11e94bc9fe 100644
--- a/packages/@ember/-internals/string/index.ts
+++ b/packages/@ember/-internals/string/index.ts
@@ -8,7 +8,7 @@ import Cache from '@ember/-internals/utils/lib/cache';
 
 const STRING_DASHERIZE_REGEXP = /[ _]/g;
 
-const STRING_DASHERIZE_CACHE = new Cache<string, string>(1000, (key) =>
+const STRING_DASHERIZE_CACHE = /* @__PURE__ */ new Cache<string, string>(1000, (key) =>
   decamelize(key).replace(STRING_DASHERIZE_REGEXP, '-')
 );
 
@@ -16,7 +16,7 @@ const STRING_CLASSIFY_REGEXP_1 = /^(-|_)+(.)?/;
 const STRING_CLASSIFY_REGEXP_2 = /(.)(-|_|\.|\s)+(.)?/g;
 const STRING_CLASSIFY_REGEXP_3 = /(^|\/|\.)([a-z])/g;
 
-const CLASSIFY_CACHE = new Cache<string, string>(1000, (str) => {
+const CLASSIFY_CACHE = /* @__PURE__ */ new Cache<string, string>(1000, (str) => {
   let replace1 = (_match: string, _separator: string, chr: string) =>
     chr ? `_${chr.toUpperCase()}` : '';
   let replace2 = (_match: string, initialChar: string, _separator: string, chr: string) =>
@@ -35,7 +35,7 @@ const CLASSIFY_CACHE = new Cache<string, string>(1000, (str) => {
 
 const STRING_DECAMELIZE_REGEXP = /([a-z\d])([A-Z])/g;
 
-const DECAMELIZE_CACHE = new Cache<string, string>(1000, (str) =>
+const DECAMELIZE_CACHE = /* @__PURE__ */ new Cache<string, string>(1000, (str) =>
   str.replace(STRING_DECAMELIZE_REGEXP, '$1_$2').toLowerCase()
 );
 
diff --git a/packages/@ember/-internals/utils/lib/dictionary.ts b/packages/@ember/-internals/utils/lib/dictionary.ts
index a1281cfdeb8..3a5e7f324ca 100644
--- a/packages/@ember/-internals/utils/lib/dictionary.ts
+++ b/packages/@ember/-internals/utils/lib/dictionary.ts
@@ -3,6 +3,7 @@
 // appears worthwhile in some usecases. Please note, these deletes do increase
 // the cost of creation dramatically over a plain Object.create. And as this
 // only makes sense for long-lived dictionaries that aren't instantiated often.
+/* @__NO_SIDE_EFFECTS__ */
 export default function makeDictionary<T>(parent: { [key: string]: T } | null): {
   [key: string]: T;
 } {
diff --git a/packages/@ember/-internals/utils/lib/guid.ts b/packages/@ember/-internals/utils/lib/guid.ts
index a36a94c408b..cc4f1ea5e5d 100644
--- a/packages/@ember/-internals/utils/lib/guid.ts
+++ b/packages/@ember/-internals/utils/lib/guid.ts
@@ -50,7 +50,7 @@ const NON_OBJECT_GUIDS = new Map();
   @type String
   @final
 */
-export const GUID_KEY = intern(`__ember${Date.now()}`);
+export const GUID_KEY = /* @__PURE__ */ intern(`__ember${Date.now()}`);
 
 /**
   Generates a new guid, optionally saving the guid to the object that you
diff --git a/packages/@ember/-internals/utils/lib/intern.ts b/packages/@ember/-internals/utils/lib/intern.ts
index 9d433ab1c7d..aa1d3a65e4f 100644
--- a/packages/@ember/-internals/utils/lib/intern.ts
+++ b/packages/@ember/-internals/utils/lib/intern.ts
@@ -37,6 +37,7 @@
   @private
   @return {String} interned version of the provided string
 */
+/* @__NO_SIDE_EFFECTS__ */
 export default function intern<S extends string>(str: S): S {
   let obj: Record<S, number> = Object.create(null);
   obj[str] = 1;
diff --git a/packages/@ember/-internals/views/lib/mixins/action_support.ts b/packages/@ember/-internals/views/lib/mixins/action_support.ts
index a4c95d28ac3..d431f56bf55 100644
--- a/packages/@ember/-internals/views/lib/mixins/action_support.ts
+++ b/packages/@ember/-internals/views/lib/mixins/action_support.ts
@@ -14,7 +14,7 @@ import { assert } from '@ember/debug';
 interface ActionSupport {
   send(actionName: string, ...args: unknown[]): void;
 }
-const ActionSupport = Mixin.create({
+const ActionSupport = /* @__PURE__ */ Mixin.create({
   send(actionName: string, ...args: unknown[]) {
     assert(
       `Attempted to call .send() with the action '${actionName}' on the destroyed object '${this}'.`,
diff --git a/packages/@ember/-internals/views/lib/views/core_view.ts b/packages/@ember/-internals/views/lib/views/core_view.ts
index ceb6c0cfa8f..fff27537ea7 100644
--- a/packages/@ember/-internals/views/lib/views/core_view.ts
+++ b/packages/@ember/-internals/views/lib/views/core_view.ts
@@ -24,7 +24,7 @@ import states from './states';
 */
 
 interface CoreView extends Evented, ActionHandler, View {}
-class CoreView extends FrameworkObject.extend(Evented, ActionHandler) {
+class CoreView extends /* @__PURE__ */ FrameworkObject.extend(Evented, ActionHandler) {
   isView = true;
 
   declare _states: typeof states;
diff --git a/packages/@ember/array/index.ts b/packages/@ember/array/index.ts
index c309dfdce49..b9a7b86f0b1 100644
--- a/packages/@ember/array/index.ts
+++ b/packages/@ember/array/index.ts
@@ -1139,7 +1139,7 @@ interface EmberArray<T> extends Enumerable {
   */
   without(value: T): NativeArray<T>;
 }
-const EmberArray = Mixin.create(Enumerable, {
+const EmberArray = /* @__PURE__ */ Mixin.create(Enumerable, {
   init() {
     this._super(...arguments);
     setEmberArray(this);
@@ -1687,7 +1687,7 @@ interface MutableArray<T> extends EmberArray<T>, MutableEnumerable {
   */
   addObjects(objects: T[]): this;
 }
-const MutableArray = Mixin.create(EmberArray, MutableEnumerable, {
+const MutableArray = /* @__PURE__ */ Mixin.create(EmberArray, MutableEnumerable, {
   clear() {
     let len = this.length;
     if (len === 0) {
@@ -2019,7 +2019,7 @@ interface MutableArrayWithoutNative<T> extends Omit<
 */
 interface NativeArray<T> extends Array<T>, Observable, MutableArrayWithoutNative<T> {}
 
-let NativeArray = Mixin.create(MutableArray, Observable, {
+let NativeArray = /* @__PURE__ */ Mixin.create(MutableArray, Observable, {
   objectAt(idx: number) {
     return this[idx];
   },
diff --git a/packages/@ember/controller/index.ts b/packages/@ember/controller/index.ts
index a65d5dd8d3e..c7911fe8d8c 100644
--- a/packages/@ember/controller/index.ts
+++ b/packages/@ember/controller/index.ts
@@ -233,7 +233,7 @@ interface ControllerMixin<T> extends ActionHandler {
   */
   replaceRoute(...args: RouteArgs): Transition;
 }
-const ControllerMixin = Mixin.create(ActionHandler, {
+const ControllerMixin = /* @__PURE__ */ Mixin.create(ActionHandler, {
   /* ducktype as a controller */
   isController: true,
 
@@ -315,7 +315,7 @@ const ControllerMixin = Mixin.create(ActionHandler, {
   @public
 */
 interface Controller<_T = unknown> extends FrameworkObject, ControllerMixin<_T> {}
-class Controller<_T = unknown> extends FrameworkObject.extend(ControllerMixin) {}
+class Controller<_T = unknown> extends /* @__PURE__ */ FrameworkObject.extend(ControllerMixin) {}
 
 /**
   Creates a property that lazily looks up another controller in the container.
diff --git a/packages/@ember/engine/index.ts b/packages/@ember/engine/index.ts
index 478de9e9b13..15b71c46b85 100644
--- a/packages/@ember/engine/index.ts
+++ b/packages/@ember/engine/index.ts
@@ -56,7 +56,7 @@ export interface Initializer<T> {
 */
 // eslint-disable-next-line @typescript-eslint/no-empty-object-type
 interface Engine extends RegistryProxyMixin {}
-class Engine extends Namespace.extend(RegistryProxyMixin) {
+class Engine extends /* @__PURE__ */ Namespace.extend(RegistryProxyMixin) {
   static initializers: Record<string, Initializer<Engine>> = Object.create(null);
   static instanceInitializers: Record<string, Initializer<EngineInstance>> = Object.create(null);
 
diff --git a/packages/@ember/engine/instance.ts b/packages/@ember/engine/instance.ts
index 050d27eb3b8..40ebc73e4f2 100644
--- a/packages/@ember/engine/instance.ts
+++ b/packages/@ember/engine/instance.ts
@@ -53,7 +53,9 @@ export interface EngineInstanceOptions {
 // type checking, we have broken part of our public API contract. Medium-term,
 // the goal here is to `EngineInstance` simple be `Owner`.
 interface EngineInstance extends RegistryProxyMixin, ContainerProxyMixin, InternalOwner, Owner {}
-class EngineInstance extends EmberObject.extend(RegistryProxyMixin, ContainerProxyMixin) {
+class EngineInstance
+  extends /* @__PURE__ */ EmberObject.extend(RegistryProxyMixin, ContainerProxyMixin)
+{
   /**
    @private
    @method setupRegistry
diff --git a/packages/@ember/enumerable/index.ts b/packages/@ember/enumerable/index.ts
index 2929953363b..57a0397766b 100644
--- a/packages/@ember/enumerable/index.ts
+++ b/packages/@ember/enumerable/index.ts
@@ -15,6 +15,6 @@ import Mixin from '@ember/object/mixin';
 */
 // eslint-disable-next-line @typescript-eslint/no-empty-object-type
 interface Enumerable {}
-const Enumerable = Mixin.create();
+const Enumerable = /* @__PURE__ */ Mixin.create();
 
 export default Enumerable;
diff --git a/packages/@ember/enumerable/mutable.ts b/packages/@ember/enumerable/mutable.ts
index 5f1b01182b9..283e2a6dc64 100644
--- a/packages/@ember/enumerable/mutable.ts
+++ b/packages/@ember/enumerable/mutable.ts
@@ -17,6 +17,6 @@ import Mixin from '@ember/object/mixin';
 */
 // eslint-disable-next-line @typescript-eslint/no-empty-object-type
 interface MutableEnumerable extends Enumerable {}
-const MutableEnumerable = Mixin.create(Enumerable);
+const MutableEnumerable = /* @__PURE__ */ Mixin.create(Enumerable);
 
 export default MutableEnumerable;
diff --git a/packages/@ember/object/evented.ts b/packages/@ember/object/evented.ts
index 097d274d4bf..fe7c7de6562 100644
--- a/packages/@ember/object/evented.ts
+++ b/packages/@ember/object/evented.ts
@@ -149,7 +149,7 @@ interface Evented {
    */
   has(name: string): boolean;
 }
-const Evented = Mixin.create({
+const Evented = /* @__PURE__ */ Mixin.create({
   on(name: string, target: object, method?: string | Function) {
     addListener(this, name, target, method);
     return this;
diff --git a/packages/@ember/object/index.ts b/packages/@ember/object/index.ts
index f664c95ef0b..5e525e50ea3 100644
--- a/packages/@ember/object/index.ts
+++ b/packages/@ember/object/index.ts
@@ -36,7 +36,7 @@ export { default as computed } from '@ember/-internals/metal/lib/computed';
 */
 // eslint-disable-next-line @typescript-eslint/no-empty-object-type
 interface EmberObject extends Observable {}
-class EmberObject extends CoreObject.extend(Observable) {
+class EmberObject extends /* @__PURE__ */ CoreObject.extend(Observable) {
   get _debugContainerKey() {
     let factory = getFactoryFor(this);
     return factory !== undefined && factory.fullName;
diff --git a/packages/@ember/object/observable.ts b/packages/@ember/object/observable.ts
index ae4a5aad9d3..62d5997387c 100644
--- a/packages/@ember/object/observable.ts
+++ b/packages/@ember/object/observable.ts
@@ -416,7 +416,7 @@ interface Observable {
   */
   cacheFor<K extends keyof this>(key: K): unknown;
 }
-const Observable = Mixin.create({
+const Observable = /* @__PURE__ */ Mixin.create({
   get(keyName: string) {
     return get(this, keyName);
   },
diff --git a/packages/@ember/object/promise-proxy-mixin.ts b/packages/@ember/object/promise-proxy-mixin.ts
index 9571771a803..4f9f06e6523 100644
--- a/packages/@ember/object/promise-proxy-mixin.ts
+++ b/packages/@ember/object/promise-proxy-mixin.ts
@@ -211,7 +211,7 @@ interface PromiseProxyMixin<T> {
   */
   finally: this['promise']['finally'];
 }
-const PromiseProxyMixin = Mixin.create({
+const PromiseProxyMixin = /* @__PURE__ */ Mixin.create({
   reason: null,
 
   isPending: computed('isSettled', function () {
diff --git a/packages/@ember/routing/route.ts b/packages/@ember/routing/route.ts
index a14e2a66cf0..974ebe006fb 100644
--- a/packages/@ember/routing/route.ts
+++ b/packages/@ember/routing/route.ts
@@ -256,7 +256,10 @@ interface Route<Model = unknown> extends IRoute<Model>, ActionHandler, Evented {
   error?(error: Error, transition: Transition): boolean | void;
 }
 
-class Route<Model = unknown> extends EmberObject.extend(ActionHandler, Evented) implements IRoute {
+class Route<Model = unknown>
+  extends /* @__PURE__ */ EmberObject.extend(ActionHandler, Evented)
+  implements IRoute
+{
   static isRouteFactory = true;
 
   // These properties will end up appearing in the public interface because we
diff --git a/packages/@ember/routing/router-service.ts b/packages/@ember/routing/router-service.ts
index b703e47abb7..5dad8dd526a 100644
--- a/packages/@ember/routing/router-service.ts
+++ b/packages/@ember/routing/router-service.ts
@@ -62,7 +62,7 @@ interface RouterService extends Evented {
     callback: (transition: Transition) => void
   ): this;
 }
-class RouterService extends Service.extend(Evented) {
+class RouterService extends /* @__PURE__ */ Service.extend(Evented) {
   [ROUTER]?: EmberRouter;
 
   get _router(): EmberRouter {
diff --git a/packages/@ember/routing/router.ts b/packages/@ember/routing/router.ts
index 7f6d760dd9d..31b5dfb966d 100644
--- a/packages/@ember/routing/router.ts
+++ b/packages/@ember/routing/router.ts
@@ -142,7 +142,7 @@ const { slice } = Array.prototype;
   @uses Evented
   @public
 */
-class EmberRouter extends EmberObject.extend(Evented) implements Evented {
+class EmberRouter extends /* @__PURE__ */ EmberObject.extend(Evented) implements Evented {
   /**
    Represents the URL of the root of the application, often '/'. This prefix is
     assumed on all routes defined on this router.
diff --git a/packages/@ember/template-compiler/lib/dasherize-component-name.ts b/packages/@ember/template-compiler/lib/dasherize-component-name.ts
index 27c8d36e3bd..9f032970851 100644
--- a/packages/@ember/template-compiler/lib/dasherize-component-name.ts
+++ b/packages/@ember/template-compiler/lib/dasherize-component-name.ts
@@ -7,7 +7,7 @@ import Cache from '@ember/-internals/utils/lib/cache';
 const SIMPLE_DASHERIZE_REGEXP = /[A-Z]|::/g;
 const ALPHA = /[A-Za-z0-9]/;
 
-export default new Cache<string, string>(1000, (key) =>
+export default /* @__PURE__ */ new Cache<string, string>(1000, (key) =>
   key.replace(SIMPLE_DASHERIZE_REGEXP, (char, index) => {
     if (char === '::') {
       return '/';
diff --git a/packages/@glimmer/opcode-compiler/lib/template.ts b/packages/@glimmer/opcode-compiler/lib/template.ts
index 3cb2f3ff9b4..e9c886df4cc 100644
--- a/packages/@glimmer/opcode-compiler/lib/template.ts
+++ b/packages/@glimmer/opcode-compiler/lib/template.ts
@@ -41,6 +41,7 @@ export interface TemplateWithIdAndReferrer extends TemplateOk {
  * that handles lazy parsing the template and to create per env singletons
  * of the template.
  */
+/* @__NO_SIDE_EFFECTS__ */
 export default function templateFactory({
   id: templateId,
   moduleName,
diff --git a/packages/@glimmer/program/lib/constants.ts b/packages/@glimmer/program/lib/constants.ts
index 1041fbe8817..80bfac9e135 100644
--- a/packages/@glimmer/program/lib/constants.ts
+++ b/packages/@glimmer/program/lib/constants.ts
@@ -27,8 +27,9 @@ import { InternalComponentCapabilities } from '@glimmer/vm/lib/flags';
 import { DEFAULT_TEMPLATE } from './util/default-template';
 
 const WELL_KNOWN_EMPTY_ARRAY: unknown = Object.freeze([]);
-const STARTER_CONSTANTS = constants(WELL_KNOWN_EMPTY_ARRAY);
-const WELL_KNOWN_EMPTY_ARRAY_POSITION: number = STARTER_CONSTANTS.indexOf(WELL_KNOWN_EMPTY_ARRAY);
+const STARTER_CONSTANTS = /* @__PURE__ */ constants(WELL_KNOWN_EMPTY_ARRAY);
+const WELL_KNOWN_EMPTY_ARRAY_POSITION: number =
+  /* @__PURE__ */ STARTER_CONSTANTS.indexOf(WELL_KNOWN_EMPTY_ARRAY);
 
 export class ConstantsImpl implements ProgramConstants {
   protected reifiedArrs: { [key: number]: unknown[] } = {
diff --git a/packages/@glimmer/program/lib/util/default-template.ts b/packages/@glimmer/program/lib/util/default-template.ts
index 74908f1050a..f92f79b7e66 100644
--- a/packages/@glimmer/program/lib/util/default-template.ts
+++ b/packages/@glimmer/program/lib/util/default-template.ts
@@ -10,7 +10,7 @@ export const DEFAULT_TEMPLATE: SerializedTemplateWithLazyBlock = {
   // random uuid
   id: '1b32f5c2-7623-43d6-a0ad-9672898920a1',
   moduleName: '__default__.hbs',
-  block: JSON.stringify(DEFAULT_TEMPLATE_BLOCK),
+  block: /* @__PURE__ */ JSON.stringify(DEFAULT_TEMPLATE_BLOCK),
   scope: null,
   isStrictMode: true,
 };
diff --git a/packages/@glimmer/reference/lib/reference.ts b/packages/@glimmer/reference/lib/reference.ts
index c7232d0469a..bed9415b6b8 100644
--- a/packages/@glimmer/reference/lib/reference.ts
+++ b/packages/@glimmer/reference/lib/reference.ts
@@ -52,6 +52,7 @@ class ReferenceImpl<T = unknown> implements Reference<T> {
   }
 }
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createPrimitiveRef<T extends string | symbol | number | boolean | null | undefined>(
   value: T
 ): Reference<T> {
@@ -72,6 +73,7 @@ export const NULL_REFERENCE = createPrimitiveRef(null);
 export const TRUE_REFERENCE = createPrimitiveRef(true as const);
 export const FALSE_REFERENCE = createPrimitiveRef(false as const);
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createConstRef<T>(value: T, debugLabel: false | string): Reference<T> {
   const ref = new ReferenceImpl<T>(CONSTANT);
 
@@ -85,6 +87,7 @@ export function createConstRef<T>(value: T, debugLabel: false | string): Referen
   return ref;
 }
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createUnboundRef<T>(value: T, debugLabel: false | string): Reference<T> {
   const ref = new ReferenceImpl<T>(UNBOUND);
 
@@ -98,6 +101,7 @@ export function createUnboundRef<T>(value: T, debugLabel: false | string): Refer
   return ref;
 }
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createComputeRef<T = unknown>(
   compute: () => T,
   update: Nullable<(value: T) => void> = null,
@@ -115,6 +119,7 @@ export function createComputeRef<T = unknown>(
   return ref;
 }
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createReadOnlyRef(ref: Reference): Reference {
   if (!isUpdatableRef(ref)) return ref;
 
@@ -125,6 +130,7 @@ export function isInvokableRef(ref: Reference) {
   return ref[REFERENCE] === INVOKABLE;
 }
 
+/* @__NO_SIDE_EFFECTS__ */
 export function createInvokableRef(inner: Reference): Reference {
   const ref = createComputeRef(
     () => valueForRef(inner),
diff --git a/packages/@glimmer/runtime/lib/helpers/internal-helper.ts b/packages/@glimmer/runtime/lib/helpers/internal-helper.ts
index a5bc752e73c..089b2236c74 100644
--- a/packages/@glimmer/runtime/lib/helpers/internal-helper.ts
+++ b/packages/@glimmer/runtime/lib/helpers/internal-helper.ts
@@ -1,6 +1,7 @@
 import type { Helper, HelperDefinitionState } from '@glimmer/interfaces';
 import { setInternalHelperManager } from '@glimmer/manager/lib/internal/api';
 
+/* @__NO_SIDE_EFFECTS__ */
 export function internalHelper(helper: Helper): HelperDefinitionState {
   return setInternalHelperManager(helper, {});
 }
diff --git a/packages/@glimmer/util/lib/intern.ts b/packages/@glimmer/util/lib/intern.ts
index 422ba91e926..166e049e65e 100644
--- a/packages/@glimmer/util/lib/intern.ts
+++ b/packages/@glimmer/util/lib/intern.ts
@@ -37,6 +37,7 @@
   @private
   @return {String} interned version of the provided string
 */
+/* @__NO_SIDE_EFFECTS__ */
 export default function intern(str: string): string {
   let obj: Record<string, number> = {};
   obj[str] = 1;
diff --git a/packages/ember-testing/lib/adapters/adapter.ts b/packages/ember-testing/lib/adapters/adapter.ts
index 26876da9d42..5b496f5e6b7 100644
--- a/packages/ember-testing/lib/adapters/adapter.ts
+++ b/packages/ember-testing/lib/adapters/adapter.ts
@@ -16,7 +16,7 @@ interface Adapter extends EmberObject {
   asyncEnd(): void;
   exception(error: unknown): never;
 }
-const Adapter = EmberObject.extend({
+const Adapter = /* @__PURE__ */ EmberObject.extend({
   /**
     This callback will be called whenever an async operation is about to start.
 
diff --git a/tests/node-vitest/tree-shakability.test.js b/tests/node-vitest/tree-shakability.test.js
index b88dffd37ae..945f7fd8ecf 100644
--- a/tests/node-vitest/tree-shakability.test.js
+++ b/tests/node-vitest/tree-shakability.test.js
@@ -47,6 +47,7 @@ it('[dev] has expected tree-shakable entrypoints', async () => {
       "ember-source/@ember/-internals/string/index.js",
       "ember-source/@ember/-internals/utility-types/index.js",
       "ember-source/@ember/-internals/views/lib/compat/attrs.js",
+      "ember-source/@ember/-internals/views/lib/compat/fallback-view-registry.js",
       "ember-source/@ember/array/-internals.js",
       "ember-source/@ember/array/lib/make-array.js",
       "ember-source/@ember/array/make.js",
@@ -121,7 +122,6 @@ it('[dev] has expected tree-shakable entrypoints', async () => {
       "ember-source/@ember/-internals/runtime/lib/mixins/target_action_support.js",
       "ember-source/@ember/-internals/utils/index.js",
       "ember-source/@ember/-internals/views/index.js",
-      "ember-source/@ember/-internals/views/lib/compat/fallback-view-registry.js",
       "ember-source/@ember/-internals/views/lib/mixins/action_support.js",
       "ember-source/@ember/-internals/views/lib/system/event_dispatcher.js",
       "ember-source/@ember/-internals/views/lib/system/utils.js",
@@ -234,6 +234,7 @@ it('[prod] has expected tree-shakable entrypoints', async () => {
   expect(result.shaken).toMatchInlineSnapshot(`
     [
       "ember-source/@ember/-internals/browser-environment/index.js",
+      "ember-source/@ember/-internals/container/index.js",
       "ember-source/@ember/-internals/error-handling/index.js",
       "ember-source/@ember/-internals/meta/index.js",
       "ember-source/@ember/-internals/meta/lib/meta.js",
@@ -241,6 +242,8 @@ it('[prod] has expected tree-shakable entrypoints', async () => {
       "ember-source/@ember/-internals/string/index.js",
       "ember-source/@ember/-internals/utility-types/index.js",
       "ember-source/@ember/-internals/views/lib/compat/attrs.js",
+      "ember-source/@ember/-internals/views/lib/compat/fallback-view-registry.js",
+      "ember-source/@ember/-internals/views/lib/system/utils.js",
       "ember-source/@ember/array/-internals.js",
       "ember-source/@ember/array/lib/make-array.js",
       "ember-source/@ember/array/make.js",
@@ -310,7 +313,6 @@ it('[prod] has expected tree-shakable entrypoints', async () => {
   `);
   expect(result.notShaken).toMatchInlineSnapshot(`
     [
-      "ember-source/@ember/-internals/container/index.js",
       "ember-source/@ember/-internals/deprecations/index.js",
       "ember-source/@ember/-internals/environment/index.js",
       "ember-source/@ember/-internals/glimmer/index.js",
@@ -326,10 +328,8 @@ it('[prod] has expected tree-shakable entrypoints', async () => {
       "ember-source/@ember/-internals/runtime/lib/mixins/target_action_support.js",
       "ember-source/@ember/-internals/utils/index.js",
       "ember-source/@ember/-internals/views/index.js",
-      "ember-source/@ember/-internals/views/lib/compat/fallback-view-registry.js",
       "ember-source/@ember/-internals/views/lib/mixins/action_support.js",
       "ember-source/@ember/-internals/views/lib/system/event_dispatcher.js",
-      "ember-source/@ember/-internals/views/lib/system/utils.js",
       "ember-source/@ember/-internals/views/lib/views/core_view.js",
       "ember-source/@ember/-internals/views/lib/views/states.js",
       "ember-source/@ember/application/index.js",