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+---
+Stage: Accepted
+Start Date: 2022-05-12
+Release Date: Unreleased
+Release Versions:
+  ember-source: vX.Y.Z
+  ember-data: vX.Y.Z
+Relevant Team(s): Ember.js
+RFC PR: https://github.com/emberjs/rfcs/pull/819
+---
+
+<!--- 
+Directions for above: 
+
+Stage: Leave as is
+Start Date: Fill in with today's date, YYYY-MM-DD
+Release Date: Leave as is
+Release Versions: Leave as is
+Relevant Team(s): Fill this in with the [team(s)](README.md#relevant-teams) to which this RFC applies
+RFC PR: Fill this in with the URL for the Proposal RFC PR
+-->
+
+# Public `RouterService` import
+
+## Summary
+
+This RFC proposes adding a public import for [`RouterService`](https://api.emberjs.com/ember/release/classes/RouterService)
+making it extensible by addons, removing the external link assertion from `<LinkTo />` and rebuilding the `<LinkTo />` component
+to rely entirely on the public routing service instead of the internal `-router`.
+
+## Motivation
+
+Today, users of [`ember-engines`](https://github.com/ember-engines/ember-engines) are required to utilize separate
+custom components, helpers and services for linking. This leaves the experience feeling sub-par, in addition to introducing
+extra maintenance friction attempting to keep these primitives aligned with those in `ember-source`.
+
+By providing a public import for `RouterService`, `ember-engines` would be able to provide its own router service
+implementation extending from the base implementation. Combined with minor changes to the engines-specific behavior of
+`link-to`, this change would allow us to fill the existing DX gap when it comes to navigating between an Engine
+and a host App *and* allow engines to eliminate use of the legacy components required to support 4.x versions of Ember.
+
+These proposed changes would further allow `ember-engines` to deprecate the `<LinkToExternal />`
+component provided by `ember-engines` package. As a result, there will be less
+engine specific concepts and code would be more portable between regular applications and engines.
+
+Once this RFC gets implemented, following will be possible in user defined Ember Engines:
+
+* links to external routes in templates within the engine rendered via `<LinkTo />` component:
+
+  ```hbs
+  <LinkTo @route="external-route">Go Somewhere</LinkTo>
+  ```
+
+* using `RouterService` methods for redirects to the external routes:
+
+  ```javascript
+  # addon/components/my-component.js
+  export default class extends Component {
+    @service router;
+    @action clickLink () {
+      this.router.transitionTo('external-route');
+    }
+  }
+  ```
+
+**Bonus: improved DX for addons**
+
+This RFC seeks to provide a solution that also solves another DX issue faced by engines developers.
+
+Authors of large scale applications often create an addon(s) to contain reusable components that can
+be rendered either in the context of the host App or Engine. In such scenarios an extra guard needs
+to be introduced as the `<LinkToExternal />` component is available only in the context of an Engine
+and does not exist in the context of regular applications, so it is common to see patterns such as the following:
+
+```hbs
+{{#if @isEngine}}
+  <LinkToExternal @route="contact">Contact Us</LinkToExternal>
+{{else}}
+  <LinkTo @route="contact">Contact Us</LinkTo>
+{{/if}}
+```
+
+Once this RFC gets implemented, above snippet could be replaced with
+
+```hbs
+<LinkTo @route="contact">Contact Us</LinkTo>
+```
+
+## Detailed design
+
+### `ember-source` package
+
+This proposal does not seek to make any changes to the default blueprint.
+App author may or may not introduce overridden `RouterService` via `app/services/router.js`.
+
+If app author decide to do so and provide extended `RouterService`, it may look like:
+
+```js
+// app/services/router.js
+import RouterService from '@ember/routing/service';
+
+export default class extends RouterService {
+    // ...
+}
+```
+
+In order to make this possible, method `buildRegistry` of `Application` class will be updated to have logic like so:
+
+```js
+import { RouterService } from '@ember/-internals/routing';
+
+// ...
+
+if (!registry.has('service:router')) {
+  registry.register('service:router', RouterService);
+}
+```
+
+#### `<LinkTo />` component
+
+The use of `-routing` service in `<LinkTo />` component would be replaced with the `router` service.
+Currently, those properties being pulled from `-routing` service:
+
+* `currentState`
+* `currentRouteName`
+
+Currently, those methods of `-routing` service used:
+
+* `generateURL`
+* `transitionTo`
+* `isActiveForRoute`
+
+Additionally, any engines specific code or assertions for url and path generation would be removed, delegating
+these responsibilities instead to the router service. For instance, `<LinkTo />` should not be aware of `mountPoint`.
+
+#### `RouterService`
+
+Provide public import via `@ember/routing/service`.
+
+#### Router Helpers
+
+The changes outlined here improve the DX for engines for the not-yet implemented url helpers
+specified by [RFC#391](https://emberjs.github.io/rfcs/0391-router-helpers.html).
+Since those helpers will also utilize the routing service,
+they would be compatible with both internal and external engines paths immediately.
+
+### `ember-engines` package
+
+While not the scope of this RFC to detail the exact specifics, once these changes are implemented, `ember-engines`
+will provide a `router` service that extends from `@ember/routing/service`.
+
+```javascript
+// ember-engines/addon/services/router.js
+import RouterService from '@ember/routing/service';
+
+export default class extends RouterService {
+  // ...
+}
+```
+
+The extended `RouterService` would override or extend any necessary public methods and properties to provide a great DX
+for engines developers.
+
+## Prior Discussions
+
+- [emberjs/rfcs#806](https://github.com/emberjs/rfcs/pull/806)
+- [ember-engines/ember-engines#587](https://github.com/ember-engines/ember-engines/issues/587)
+- [ember-engines/ember-engines#779](https://github.com/ember-engines/ember-engines/issues/779)
+
+## How we teach this
+
+Ember Engines documentation provided at [ember-engines.com](https://ember-engines.com)
+should be updated with `<LinkTo />` replacing all the references of `<LinkToExternal />` component.
+
+Transition path needs to be published on [ember-engines.com](https://ember-engines.com) containing following steps:
+
+1. Replace use of `<LinkToExternal @route="external-route" />` component
+   with `<LinkTo @route="external-route" />` in every engine codebase.
+2. Users using `ember-engines-router-service` would need to replace any of its usage with
+   the `RouterService` provided by `ember-engines`. This addon was created to solve part of
+   this problem previously, and would likely be updated to become a true polyfill for the ember-engines
+   routing service.
+
+Ember Guides should be updated to rationalize and explain the difference between `app/router.js` and `app/services/router.js`.
+The confusion between those two distinct yet different entities exists even today.
+However, it's less a problem today as there is only one thing named `router.js` can exist in the app today and
+ability to create another such file (even with different purpose and semantics) may be confusing.
+
+## Drawbacks
+
+The removal of assertions within `<LinkTo />` specific to ensuring that external paths are properly mapped means that
+it is now the responsibility of the routing service provided by ember-engines to enforce that encapsulation is not
+broken unintentionally, since a user can now provide any fully qualified path to `<LinkTo />`.
+
+A similar issue arises with the routing service's `transitionTo` method when invoked with a url. For instance:
+
+```ts
+router.transitionTo('/');
+```
+
+Some prior discussion on this point is [viewable here](https://github.com/ember-engines/ember-engines/issues/587#issuecomment-483531420).
+In the case of this RFC, it would similarly become the responsibility of the engine's routing service to prefix such a url with the
+engine's mount path as appropriate, or decide to error, to preserve encapsulation.
+
+In practice, we feel the flexibility and improved DX of this solution outweighs these drawbacks, and intend to
+continue enforcing the same constraints via the engines provided service.
+
+## Alternatives
+
+* Utilize `@ember/legacy-built-in-components` to keep `<LinkToExternal />`
+  a thin wrapper around legacy implementation of `<LinkTo />` component.
+
+  As this may be considered temporary solution to solve Ember 4 compatibility for `ember-engines`,
+  this is not viable long term solution as any changes made to `<LinkTo />` component in the Ember.js codebase
+  will need to be backported to `@ember/legacy-built-in-components`.
+
+* Re-implement `<LinkTo />` functionality in `ember-engine`.
+
+  This is not viable long term solution as any changes made to `<LinkTo />` component in the Ember.js codebase
+  would need to be backported to `ember-engines`.
+
+* Deprecate and remove `externalRoutes` mapping.
+
+  This would require providing *full route name* to `<LinkTo />` component *including* engine mount point
+  within the engine code.
+  This option is not viable as it breaks isolation principle of Ember Engines
+  whereas every engine should be self-scoped micro-frontend.
+
+* Introduce `{{path-for}}` Engine Router helpers.
+
+  This option was discussed in [RFC #806 "Engine Router Helpers"](https://github.com/emberjs/rfcs/pull/806)
+  which was considered as partial solution to teh problems discussed in this RFC.
+  
+* Make ember-source handle all of the engine specific logic for routing itself.
+
+  To this point engines have only minimally been accounted for in the code of ember-source, this would digress from that.
+  This integration could be done at a later time, but it seems unnecessary to currently hoist engines specific logic
+  into applications that may not have any engines.
+
+## Unresolved questions
+
+None.