add typings for PromiseProxyMixin

types/ember/index.d.ts

@@ -1022,13 +1022,36 @@ export namespace Ember {
         toArray(): any[];
     }
     /**
-    A low level mixin making ObjectProxy promise-aware.
-    */
-    class PromiseProxyMixin {
-      catch(callback: Function): Rsvp.Promise<any, any>;
-      finally(callback: Function): Rsvp.Promise<any, any>;
-      then(callback: Function): Rsvp.Promise<any, any>;
+     * A low level mixin making ObjectProxy promise-aware.
+     */
+    interface PromiseProxyMixin<T> extends RSVP.Promise<T, any> {
+        /**
+         * If the proxied promise is rejected this will contain the reason
+         * provided.
+         */
+        reason: any;
+        /**
+         * Once the proxied promise has settled this will become `false`.
+         */
+        isPending: boolean;
+        /**
+         * Once the proxied promise has settled this will become `true`.
+         */
+        isSettled: boolean;
+        /**
+         * Will become `true` if the proxied promise is rejected.
+         */
+        isRejected: boolean;
+        /**
+         * Will become `true` if the proxied promise is fulfilled.
+         */
+        isFulfilled: boolean;
+        /**
+         * The promise whose fulfillment value is being proxied by this object.
+         */
+        promise: RSVP.Promise<T, any>;
     }
+    const PromiseProxyMixin: Mixin<PromiseProxyMixin<any>>;
     class Registry {
         constructor(options: any);
         static set: typeof Ember.set;