diff --git a/packages/statusbar-extension/src/defaults/filePath.tsx b/packages/statusbar-extension/src/defaults/filePath.tsx
index 83487000aaf1..a502607950fe 100644
--- a/packages/statusbar-extension/src/defaults/filePath.tsx
+++ b/packages/statusbar-extension/src/defaults/filePath.tsx
@@ -11,15 +11,22 @@ import {
   JupyterLab,
   ApplicationShell
 } from '@jupyterlab/application';
-import { IStatusBar, TextItem } from '@jupyterlab/statusbar';
-import { DocumentRegistry } from '@jupyterlab/docregistry';
+
 import { VDomModel, VDomRenderer } from '@jupyterlab/apputils';
+
+import { PathExt } from '@jupyterlab/coreutils';
+
+import { IDocumentManager } from '@jupyterlab/docmanager';
+
+import { DocumentRegistry } from '@jupyterlab/docregistry';
+
+import { IStatusBar, TextItem } from '@jupyterlab/statusbar';
+
 import { IDisposable } from '@phosphor/disposable';
+
 import { ISignal } from '@phosphor/signaling';
-import { Token } from '@phosphor/coreutils';
-import { PathExt } from '@jupyterlab/coreutils';
+
 import { Widget, Title } from '@phosphor/widgets';
-import { IDocumentManager } from '@jupyterlab/docmanager';
 
 namespace FilePathComponent {
   export interface IProps {
@@ -192,15 +199,9 @@ export namespace IFilePath {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const IFilePath = new Token<IFilePath>(
-  '@jupyterlab/statusbar:IFilePath'
-);
-
-export const filePathItem: JupyterLabPlugin<IFilePath> = {
-  id: '@jupyterlab/statusbar:file-path-item',
+export const filePathStatus: JupyterLabPlugin<void> = {
+  id: '@jupyterlab/statusbar:file-path-status',
   autoStart: true,
-  provides: IFilePath,
   requires: [IStatusBar, IDocumentManager],
   activate: (
     app: JupyterLab,
@@ -216,7 +217,5 @@ export const filePathItem: JupyterLabPlugin<IFilePath> = {
         return true;
       }
     });
-
-    return item;
   }
 };
diff --git a/packages/statusbar-extension/src/defaults/lineCol.tsx b/packages/statusbar-extension/src/defaults/lineCol.tsx
index e2fef09a94d8..2ce6e0d02894 100644
--- a/packages/statusbar-extension/src/defaults/lineCol.tsx
+++ b/packages/statusbar-extension/src/defaults/lineCol.tsx
@@ -4,34 +4,55 @@
 /**
  * Part of Jupyterlab status bar defaults.
  */
+
 import React from 'react';
-import { TextItem } from '@jupyterlab/statusbar';
+
 import {
   JupyterLabPlugin,
   JupyterLab,
   ApplicationShell
 } from '@jupyterlab/application';
-import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
+
 import {
   VDomRenderer,
   VDomModel,
   ReactElementWidget
 } from '@jupyterlab/apputils';
-import { CodeEditor } from '@jupyterlab/codeeditor';
-import { IEditorTracker, FileEditor } from '@jupyterlab/fileeditor';
-import { ISignal } from '@phosphor/signaling';
+
 import { Cell, CodeCell } from '@jupyterlab/cells';
+
+import {
+  IConsoleTracker,
+  ConsolePanel,
+  CodeConsole
+} from '@jupyterlab/console';
+
+import { CodeEditor } from '@jupyterlab/codeeditor';
+
 import { IDocumentWidget } from '@jupyterlab/docregistry';
-import { IDisposable } from '@phosphor/disposable';
-import { Token } from '@phosphor/coreutils';
-import { Widget } from '@phosphor/widgets';
-import { IStatusContext } from '../contexts';
+
+import { IEditorTracker, FileEditor } from '@jupyterlab/fileeditor';
+
+import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
+
 import {
   IStatusBar,
   interactiveItem,
   showPopup,
-  Popup
+  Popup,
+  TextItem
 } from '@jupyterlab/statusbar';
+
+import { IDisposable } from '@phosphor/disposable';
+
+import { Message } from '@phosphor/messaging';
+
+import { ISignal } from '@phosphor/signaling';
+
+import { Widget } from '@phosphor/widgets';
+
+import { IStatusContext } from '../contexts';
+
 import {
   lineFormWrapper,
   lineFormInput,
@@ -40,13 +61,8 @@ import {
   lineFormCaption,
   lineFormButton
 } from '../style/lineForm';
+
 import { classes } from 'typestyle/lib';
-import { Message } from '@phosphor/messaging';
-import {
-  IConsoleTracker,
-  ConsolePanel,
-  CodeConsole
-} from '@jupyterlab/console';
 
 namespace LineForm {
   export interface IProps {
@@ -386,13 +402,9 @@ export namespace ILineCol {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const ILineCol = new Token<ILineCol>('@jupyterlab/statusbar:ILineCol');
-
-export const lineColItem: JupyterLabPlugin<ILineCol> = {
+export const lineColItem: JupyterLabPlugin<void> = {
   id: '@jupyterlab/statusbar:line-col-item',
   autoStart: true,
-  provides: ILineCol,
   requires: [IStatusBar, INotebookTracker, IEditorTracker, IConsoleTracker],
   activate: (
     app: JupyterLab,
@@ -417,7 +429,5 @@ export const lineColItem: JupyterLabPlugin<ILineCol> = {
         { tracker: consoleTracker }
       ])
     });
-
-    return item;
   }
 };
diff --git a/packages/statusbar-extension/src/defaults/memoryUsage.tsx b/packages/statusbar-extension/src/defaults/memoryUsage.tsx
index 3577d82becd2..f85390ee541e 100644
--- a/packages/statusbar-extension/src/defaults/memoryUsage.tsx
+++ b/packages/statusbar-extension/src/defaults/memoryUsage.tsx
@@ -5,15 +5,21 @@
  * Part of Jupyterlab status bar defaults.
  */
 import React from 'react';
-import { ISignal } from '@phosphor/signaling';
-import { IDisposable } from '@phosphor/disposable';
-import { Token } from '@phosphor/coreutils';
+
 import { JupyterLabPlugin, JupyterLab } from '@jupyterlab/application';
+
 import { VDomModel, VDomRenderer } from '@jupyterlab/apputils';
-import { ServerConnection } from '@jupyterlab/services';
+
 import { URLExt } from '@jupyterlab/coreutils';
+
 import { IStatusBar, TextItem } from '@jupyterlab/statusbar';
 
+import { ServerConnection } from '@jupyterlab/services';
+
+import { IDisposable } from '@phosphor/disposable';
+
+import { ISignal } from '@phosphor/signaling';
+
 class MemoryUsage extends VDomRenderer<MemoryUsage.Model>
   implements IMemoryUsage {
   constructor() {
@@ -247,15 +253,9 @@ namespace Private {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const IMemoryUsage = new Token<IMemoryUsage>(
-  '@jupyterlab/statusbar:IMemoryUsage'
-);
-
-export const memoryUsageItem: JupyterLabPlugin<IMemoryUsage> = {
+export const memoryUsageItem: JupyterLabPlugin<void> = {
   id: '@jupyterlab/statusbar:memory-usage-item',
   autoStart: true,
-  provides: IMemoryUsage,
   requires: [IStatusBar],
   activate: (app: JupyterLab, statusBar: IStatusBar) => {
     let item = new MemoryUsage();
@@ -266,7 +266,5 @@ export const memoryUsageItem: JupyterLabPlugin<IMemoryUsage> = {
       isActive: () => item.model!.metricsAvailable,
       stateChanged: item.model!.stateChanged
     });
-
-    return item;
   }
 };
diff --git a/packages/statusbar-extension/src/defaults/runningSessions.tsx b/packages/statusbar-extension/src/defaults/runningSessions.tsx
index cdf8d6a3ae01..255965bb0c4d 100644
--- a/packages/statusbar-extension/src/defaults/runningSessions.tsx
+++ b/packages/statusbar-extension/src/defaults/runningSessions.tsx
@@ -5,13 +5,15 @@
  * Part of Jupyterlab status bar defaults.
  */
 import React from 'react';
-import { IconItem } from '@jupyterlab/statusbar';
-import { TextItem } from '@jupyterlab/statusbar';
+
 import {
   JupyterLabPlugin,
   JupyterLab,
   ApplicationShell
 } from '@jupyterlab/application';
+
+import { VDomRenderer, VDomModel } from '@jupyterlab/apputils';
+
 import {
   ServiceManager,
   Kernel,
@@ -19,12 +21,18 @@ import {
   TerminalManager,
   SessionManager
 } from '@jupyterlab/services';
-import { VDomRenderer, VDomModel } from '@jupyterlab/apputils';
-import { ISignal } from '@phosphor/signaling';
+
+import {
+  GroupItem,
+  IconItem,
+  IStatusBar,
+  interactiveItem,
+  TextItem
+} from '@jupyterlab/statusbar';
+
 import { IDisposable } from '@phosphor/disposable';
-import { Token } from '@phosphor/coreutils';
-import { GroupItem } from '@jupyterlab/statusbar';
-import { IStatusBar, interactiveItem } from '@jupyterlab/statusbar';
+
+import { ISignal } from '@phosphor/signaling';
 
 const HALF_SPACING = 4;
 
@@ -169,18 +177,12 @@ export namespace IRunningSessions {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const IRunningSessions = new Token<IRunningSessions>(
-  '@jupyterlab/statusbar:IRunningSessions'
-);
-
 /*
  * Initialization data for the statusbar extension.
  */
-export const runningSessionsItem: JupyterLabPlugin<IRunningSessions> = {
+export const runningSessionsItem: JupyterLabPlugin<void> = {
   id: '@jupyterlab/statusbar:running-sessions-item',
   autoStart: true,
-  provides: IRunningSessions,
   requires: [IStatusBar],
   activate: (app: JupyterLab, statusBar: IStatusBar) => {
     const item = new RunningSessions({
@@ -192,7 +194,5 @@ export const runningSessionsItem: JupyterLabPlugin<IRunningSessions> = {
       align: 'left',
       rank: 0
     });
-
-    return item;
   }
 };
diff --git a/packages/statusbar-extension/src/defaults/savingStatus.tsx b/packages/statusbar-extension/src/defaults/savingStatus.tsx
index 7ccd3e7304b7..f289789d737b 100644
--- a/packages/statusbar-extension/src/defaults/savingStatus.tsx
+++ b/packages/statusbar-extension/src/defaults/savingStatus.tsx
@@ -5,14 +5,20 @@ import {
   JupyterLab,
   ApplicationShell
 } from '@jupyterlab/application';
-import { IStatusBar, TextItem } from '@jupyterlab/statusbar';
-import { DocumentRegistry } from '@jupyterlab/docregistry';
+
 import { VDomModel, VDomRenderer } from '@jupyterlab/apputils';
+
+import { IDocumentManager } from '@jupyterlab/docmanager';
+
+import { DocumentRegistry } from '@jupyterlab/docregistry';
+
+import { IStatusBar, TextItem } from '@jupyterlab/statusbar';
+
 import { IDisposable } from '@phosphor/disposable';
+
 import { ISignal } from '@phosphor/signaling';
-import { Token } from '@phosphor/coreutils';
+
 import { Widget } from '@phosphor/widgets';
-import { IDocumentManager } from '@jupyterlab/docmanager';
 
 namespace SavingStatusComponent {
   export interface IProps {
@@ -149,15 +155,9 @@ export namespace ISavingStatus {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const ISavingStatus = new Token<ISavingStatus>(
-  '@jupyterlab/statusbar:ISavingStatus'
-);
-
-export const savingStatusItem: JupyterLabPlugin<ISavingStatus> = {
+export const savingStatusItem: JupyterLabPlugin<void> = {
   id: '@jupyterlab/statusbar:saving-status-item',
   autoStart: true,
-  provides: ISavingStatus,
   requires: [IStatusBar, IDocumentManager],
   activate: (
     app: JupyterLab,
@@ -173,7 +173,5 @@ export const savingStatusItem: JupyterLabPlugin<ISavingStatus> = {
       },
       stateChanged: item.model!.stateChanged
     });
-
-    return item;
   }
 };
diff --git a/packages/statusbar-extension/src/defaults/tabSpace.tsx b/packages/statusbar-extension/src/defaults/tabSpace.tsx
index f7e162fd534e..109b0d44e968 100644
--- a/packages/statusbar-extension/src/defaults/tabSpace.tsx
+++ b/packages/statusbar-extension/src/defaults/tabSpace.tsx
@@ -5,36 +5,49 @@
  * Part of Jupyterlab status bar defaults.
  */
 import React from 'react';
-import { TextItem, SettingsConnector } from '@jupyterlab/statusbar';
 
 import {
   JupyterLabPlugin,
   JupyterLab,
   ApplicationShell
 } from '@jupyterlab/application';
-import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
+
 import { VDomRenderer, VDomModel } from '@jupyterlab/apputils';
-import { IEditorTracker } from '@jupyterlab/fileeditor';
-import { ISignal } from '@phosphor/signaling';
+
 import { Cell } from '@jupyterlab/cells';
-import { IDisposable } from '@phosphor/disposable';
-import { Token } from '@phosphor/coreutils';
-import { Widget } from '@phosphor/widgets';
-import { IStatusContext } from '../contexts';
-import { CommandRegistry } from '@phosphor/commands';
-import { Menu } from '@phosphor/widgets';
 
-import { JSONObject } from '@phosphor/coreutils';
-import { showPopup, Popup } from '@jupyterlab/statusbar';
+import { IConsoleTracker, ConsolePanel } from '@jupyterlab/console';
+
+import { ISettingRegistry } from '@jupyterlab/coreutils';
+
+import { IEditorTracker } from '@jupyterlab/fileeditor';
+
+import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
+
 import {
   IStatusBar,
   interactiveItem,
-  clickedItem
+  clickedItem,
+  Popup,
+  showPopup,
+  TextItem,
+  SettingsConnector
 } from '@jupyterlab/statusbar';
-import { IConsoleTracker, ConsolePanel } from '@jupyterlab/console';
-import { ISettingRegistry } from '@jupyterlab/coreutils';
+
+import { CommandRegistry } from '@phosphor/commands';
+
+import { JSONObject } from '@phosphor/coreutils';
+
+import { IDisposable } from '@phosphor/disposable';
+
 import { Message } from '@phosphor/messaging';
 
+import { ISignal } from '@phosphor/signaling';
+
+import { Menu, Widget } from '@phosphor/widgets';
+
+import { IStatusContext } from '../contexts';
+
 namespace TabSpaceComponent {
   export interface IProps {
     tabSpace: number;
@@ -389,15 +402,9 @@ export namespace ITabSpace {
   }
 }
 
-// tslint:disable-next-line:variable-name
-export const ITabSpace = new Token<ITabSpace>(
-  '@jupyterlab/statusbar:ITabSpace'
-);
-
-export const tabSpaceItem: JupyterLabPlugin<ITabSpace> = {
+export const tabSpaceItem: JupyterLabPlugin<void> = {
   id: '@jupyterlab/statusbar:tab-space-item',
   autoStart: true,
-  provides: ITabSpace,
   requires: [
     IStatusBar,
     INotebookTracker,
@@ -513,8 +520,6 @@ export const tabSpaceItem: JupyterLabPlugin<ITabSpace> = {
         { tracker: consoleTracker }
       ])
     });
-
-    return item;
   }
 };
 
diff --git a/packages/statusbar-extension/src/index.ts b/packages/statusbar-extension/src/index.ts
index 55c851fe25ff..21e39b75410e 100644
--- a/packages/statusbar-extension/src/index.ts
+++ b/packages/statusbar-extension/src/index.ts
@@ -11,7 +11,7 @@ import {
   lineColItem,
   kernelStatus,
   runningSessionsItem,
-  filePathItem,
+  filePathStatus,
   tabSpaceItem,
   memoryUsageItem,
   savingStatusItem
@@ -36,7 +36,7 @@ const plugins: JupyterLabPlugin<any>[] = [
   lineColItem,
   kernelStatus,
   runningSessionsItem,
-  filePathItem,
+  filePathStatus,
   tabSpaceItem,
   memoryUsageItem,
   savingStatusItem