[FEATURE Router Service] Make Transition a public type and document

packages/@ember/-internals/routing/lib/services/router.ts

@@ -146,7 +146,7 @@ export default class RouterService extends Service {
   }
 }
 
-RouterService.reopen(Evented, {
+RouterService.reopen({
   /**
      Name of the current route.
 

packages/@ember/-internals/routing/lib/system/route-info.ts

@@ -0,0 +1,195 @@
+/**
+  A `RouteInfoWithAttributes` is an object that contains
+  metadata, including the resolved value from the routes
+  `model` hook. Like `RouteInfo`, a `RouteInfoWithAttributes`
+  represents a specific route with in a Transition.
+  It is read-only and internally immutable. It is also not
+  observable, because a Transition instance is never
+  changed after creation.
+
+  @class RouteInfoWithAttributes
+  @category ember-routing-router-service
+  @public
+
+  The dot-separated, fully-qualified name of the
+  route, like "people.index".
+  @property {String} name
+  @category ember-routing-router-service
+  @public
+
+  The final segment of the fully-qualified name of
+  the route, like "index"
+  @property {String} localName
+  @category ember-routing-router-service
+  @public
+
+  The values of the route's parametes. These are the
+  same params that are recieved as arguments to the
+  route's model hook. Contains only the parameters
+  valid for this route, if any (params for parent or
+  child routes are not merged).
+  @property {Object} params
+  @category ember-routing-router-service
+  @public
+
+  The ordered list of the names of the params
+  required for this route. It will contain the same
+  strings as Object.keys(params), but here the order
+  is significant. This allows users to correctly pass
+  params into routes programmatically.
+  @property {Array} paramNames
+  @category ember-routing-router-service
+  @public
+
+  The values of any queryParams on this route.
+  @property {Object} queryParams
+  @category ember-routing-router-service
+  @public
+
+  This is the resolved return value from the
+  route's model hook.
+  @property {Object|Array|String} attributes
+  @category ember-routing-router-service
+  @public
+
+  A reference to the parent route's RouteInfo.
+  This can be used to traverse upward to the topmost
+  `RouteInfo`.
+  @property {RouteInfo|null} parent
+  @category ember-routing-router-service
+  @public
+
+  A reference to the child route's RouteInfo.
+  This can be used to traverse downward to the
+  leafmost `RouteInfo`.
+  @property {RouteInfo|null} child
+  @category ember-routing-router-service
+  @public
+
+  Allows you to traverse through the linked list
+  of `RouteInfo`s from the topmost to leafmost.
+  Returns the first `RouteInfo` in the linked list
+  for which the callback returns true.
+
+    This method is similar to the `find()` method
+    defined in ECMAScript 2015.
+
+    The callback method you provide should have the
+    following signature (all parameters are optional):
+
+    ```javascript
+    function(item, index, array);
+    ```
+
+    - `item` is the current item in the iteration.
+    - `index` is the current index in the iteration.
+    - `array` is the array itself.
+
+    It should return the `true` to include the item in
+    the results, `false` otherwise.
+
+    Note that in addition to a callback, you can also
+    pass an optional target object that will be set as
+    `this` on the context.
+
+  @method find
+  @param {Function} callback the callback to execute
+  @param {Object} [target*] optional target to use
+  @returns {Object} Found item or undefined
+  @category ember-routing-router-service
+  @public
+*/
+
+/**
+  A RouteInfo is an object that contains metadata
+  about a specific route with in a Transition. It is
+  read-only and internally immutable. It is also not
+  observable, because a Transition instance is never
+  changed after creation.
+
+  @class RouteInfo
+  @category ember-routing-router-service
+  @public
+
+  The dot-separated, fully-qualified name of the
+  route, like "people.index".
+  @property {String} name
+  @category ember-routing-router-service
+  @public
+
+  The final segment of the fully-qualified name of
+  the route, like "index"
+  @property {String} localName
+  @category ember-routing-router-service
+  @public
+
+  The values of the route's parametes. These are the
+  same params that are recieved as arguments to the
+  route's model hook. Contains only the parameters
+  valid for this route, if any (params for parent or
+  child routes are not merged).
+  @property {Object} params
+  @category ember-routing-router-service
+  @public
+
+  The ordered list of the names of the params
+  required for this route. It will contain the same
+  strings as Object.keys(params), but here the order
+  is significant. This allows users to correctly pass
+  params into routes programmatically.
+  @property {Array} paramNames
+  @category ember-routing-router-service
+  @public
+
+  The values of any queryParams on this route.
+  @property {Object} queryParams
+  @category ember-routing-router-service
+  @public
+
+  A reference to the parent route's RouteInfo.
+  This can be used to traverse upward to the topmost
+  `RouteInfo`.
+  @property {RouteInfo|null} parent
+  @category ember-routing-router-service
+  @public
+
+  A reference to the child route's RouteInfo.
+  This can be used to traverse downward to the
+  leafmost `RouteInfo`.
+  @property {RouteInfo|null} child
+  @category ember-routing-router-service
+  @public
+
+  Allows you to traverse through the linked list
+  of `RouteInfo`s from the topmost to leafmost.
+  Returns the first `RouteInfo` in the linked list
+  for which the callback returns true.
+
+    This method is similar to the `find()` method
+    defined in ECMAScript 2015.
+
+    The callback method you provide should have the
+    following signature (all parameters are optional):
+
+    ```javascript
+    function(item, index, array);
+    ```
+
+    - `item` is the current item in the iteration.
+    - `index` is the current index in the iteration.
+    - `array` is the array itself.
+
+    It should return the `true` to include the item in
+    the results, `false` otherwise.
+
+    Note that in addition to a callback, you can also
+    pass an optional target object that will be set as
+    `this` on the context.
+
+  @method find
+  @param {Function} callback the callback to execute
+  @param {Object} [target*] optional target to use
+  @returns {Object} Found item or undefined
+  @category ember-routing-router-service
+  @public
+*/

packages/@ember/-internals/routing/lib/system/transition.ts

@@ -11,7 +11,7 @@
   @param {Object} intent
   @param {Object} state
   @param {Object} error
-  @private
+  @public
 */
 
 /**
@@ -139,6 +139,28 @@
   @public
 */
 
+/**
+ * This property is a `RouteInfo` object that represents
+ * where the router is transitioning to. It's important
+ * to note that a `RouteInfo` is a linked list and this
+ * property is simply represents leafmost route.
+ * @property {RouteInfo} to
+ * @public
+ * @category ember-routing-router-service
+ */
+
+/**
+ * This property is a `RouteInfo` object that represents
+ * where transition originated from. It's important
+ * to note that a `RouteInfo` is a linked list and this
+ * property is simply represents head node of the list.
+ * In the case of an initial render, from will be set to
+ * `null`.
+ * @property {RouteInfo} from
+ * @public
+ * @category ember-routing-router-service
+ */
+
 /**
   Transitions are aborted and their promises rejected
   when redirects occur; this method returns a promise