Minor updates to outputarea

packages/outputarea/src/model.ts

@@ -5,6 +5,10 @@ import {
   each, map, toArray
 } from '@phosphor/algorithm';
 
+import {
+  IDisposable
+} from '@phosphor/disposable';
+
 import {
   ISignal, Signal
 } from '@phosphor/signaling';

packages/outputarea/src/widget.ts

@@ -5,14 +5,6 @@ import {
   Kernel, KernelMessage
 } from '@jupyterlab/services';
 
-import {
-  IDisposable
-} from '@phosphor/disposable';
-
-import {
-  ISignal
-} from '@phosphor/signaling';
-
 import {
   Message
 } from '@phosphor/messaging';
@@ -38,7 +30,7 @@ import {
 } from '@jupyterlab/apputils';
 
 import {
-  ObservableVector, nbformat, IModelDB
+  nbformat
 } from '@jupyterlab/coreutils';
 
 import {
@@ -364,7 +356,7 @@ class OutputArea extends Widget {
     if (!payload || !payload.length) {
       return;
     }
-    let pages = payload.filter(i => (i as any).source === 'page');
+    let pages = payload.filter((i: any) => (i as any).source === 'page');
     if (!pages.length) {
       return;
     }