[FEATURE beta] Add an optional feature "no-implicit-route-model" to allow the removal of the implicit loading of a model per RFC #774

packages/@ember/-internals/environment/lib/env.ts

@@ -142,6 +142,22 @@ export const ENV = {
   */
   _DEFAULT_ASYNC_OBSERVERS: false,
 
+  /**
+   Whether the app still has default record-loading behavior in the model
+   hook from RFC https://rfcs.emberjs.com/id/0774-implicit-record-route-loading
+   This will also remove the default store property from the route.
+
+   This is not intended to be set directly, as the implementation may change in
+   the future. Use `@ember/optional-features` instead.
+
+   @property _NO_IMPLICIT_ROUTE_MODEL
+   @for EmberENV
+   @type Boolean
+   @default false
+   @private
+   */
+  _NO_IMPLICIT_ROUTE_MODEL: false,
+
   /**
     Controls the maximum number of scheduled rerenders without "settling". In general,
     applications should not need to modify this environment variable, but please

packages/@ember/routing/route.ts

@@ -7,6 +7,7 @@ import {
 } from '@ember/-internals/metal';
 import type Owner from '@ember/owner';
 import { getOwner } from '@ember/-internals/owner';
+import { ENV } from '@ember/-internals/environment';
 import { BucketCache } from '@ember/routing/-internals';
 import EmberObject, { computed, get, set, getProperties, setProperties } from '@ember/object';
 import Evented from '@ember/object/evented';
@@ -1251,6 +1252,9 @@ class Route<Model = unknown> extends EmberObject.extend(ActionHandler, Evented)
     @private
   */
   findModel(type: string, value: unknown) {
+    if (ENV._NO_IMPLICIT_ROUTE_MODEL) {
+      return;
+    }
     deprecate(
       `The implicit model loading behavior for routes is deprecated. ` +
         `Please define an explicit model hook for ${this.fullRouteName}.`,

packages/@ember/routing/tests/system/route_test.js

@@ -1,4 +1,5 @@
 import { setOwner } from '@ember/-internals/owner';
+import { ENV } from '@ember/-internals/environment';
 import { runDestroy, buildOwner, moduleFor, AbstractTestCase } from 'internal-test-helpers';
 import Service, { service } from '@ember/service';
 import EmberObject from '@ember/object';
@@ -22,6 +23,17 @@ moduleFor(
       route = routeOne = routeTwo = lookupHash = undefined;
     }
 
+    ['@test noops if _NO_IMPLICIT_ROUTE_MODEL is true'](assert) {
+      this._NO_IMPLICIT_ROUTE_MODEL = ENV._NO_IMPLICIT_ROUTE_MODEL;
+      ENV._NO_IMPLICIT_ROUTE_MODEL = true;
+      assert.equal(
+        route.findModel('post', 1),
+        undefined,
+        'When _NO_IMPLICIT_ROUTE_MODEL is true, findModel does nothing'
+      );
+      ENV._NO_IMPLICIT_ROUTE_MODEL = this._NO_IMPLICIT_ROUTE_MODEL;
+    }
+
     ['@test default store utilizes the container to acquire the model factory'](assert) {
       assert.expect(5);
 

tests/docs/expected.js

@@ -10,6 +10,7 @@ module.exports = {
     '_APPLICATION_TEMPLATE_WRAPPER',
     '_DEBUG_RENDER_TREE',
     '_DEFAULT_ASYNC_OBSERVERS',
+    '_NO_IMPLICIT_ROUTE_MODEL',
     '_RERENDER_LOOP_LIMIT',
     '_TEMPLATE_ONLY_GLIMMER_COMPONENTS',
     'Input',