Implicit injection deprecations for v4.0.0

content/ember/v4/deprecate-implicit-injection.md

@@ -0,0 +1,45 @@
+---
+id: implicit-injections
+title: "Implicit Injections"
+until: '5.0.0'
+since: '4.0.0'
+---
+
+Implicit injections have been [deprecated](https://deprecations.emberjs.com/v3.x#toc_implicit-injections) since Ember v3.26.0.  As of v4.0.0, implicit injections do nothing and should be removed based on suggestions in the original deprecation.
+
+Before:
+
+```js
+export default {
+  initialize(app) {
+    app.inject('route', 'store', 'service:store');
+  }
+}
+```
+
+```js
+import { Route } from '@ember/routing/route';
+
+export default class ApplicationRoute extends Route {
+  model() {
+    return this.store.findQuery('user', 123);
+  }
+}
+```
+
+After:
+
+```js
+import { Route } from '@ember/routing/route';
+import { inject as service } from '@ember/service';
+
+export default class ApplicationRoute extends Route {
+  @service store;
+
+  model() {
+    return this.store.findQuery('user', 123);
+  }
+}
+```
+
+For a more detailed explanation with additional examples, see the 3.x deprecation [guides](https://deprecations.emberjs.com/v3.x#toc_implicit-injections).