feat(ember-simple-auth): note responseJSON and responseText as deprec…

…ated

packages/ember-simple-auth/src/authenticators/oauth2-password-grant.ts

@@ -46,6 +46,17 @@ type MakeRequestData =
   | OAuthInvalidateRequestData
   | OAuthRefreshRequestData;
 
+interface OAuth2Response extends Response {
+  /**
+   * @deprecated 'responseText' is deprecated. This is a legacy AJAX API.
+   */
+  responseText: string;
+  /**
+   * @deprecated 'responseJSON' is deprecated. This is a legacy AJAX API.
+   */
+  responseJSON: string;
+}
+
 /**
   Authenticator that conforms to OAuth 2
   ([RFC 6749](http://tools.ietf.org/html/rfc6749)), specifically the _"Resource
@@ -369,7 +380,7 @@ export default class OAuth2PasswordGrantAuthenticator extends BaseAuthenticator
     url: string,
     data: MakeRequestData,
     headers: Record<string, string> = {}
-  ): Promise<OAuthResponseSuccess & { responseText: string } & { responseJSON: string }> {
+  ): Promise<OAuthResponseSuccess> {
     headers['Content-Type'] = 'application/x-www-form-urlencoded';
 
     const clientId = this.get('clientId');
@@ -403,15 +414,13 @@ export default class OAuth2PasswordGrantAuthenticator extends BaseAuthenticator
             try {
               let json = JSON.parse(text);
               if (!response.ok) {
-                // @TODO: migrate the old AJAX API.
-                (response as any).responseJSON = json;
+                (response as OAuth2Response).responseJSON = json;
                 reject(response);
               } else {
                 resolve(json);
               }
             } catch (SyntaxError) {
-              // @TODO: migrate the old AJAX API.
-              (response as any).responseText = text;
+              (response as OAuth2Response).responseText = text;
               reject(response);
             }
           });