Remove errant let -> const

.eslintrc.js

@@ -41,7 +41,7 @@ module.exports = {
     'no-undef': 'warn',
     'no-case-declarations': 'warn',
     'no-useless-escape': 'off',
-    'prefer-const': 'warn'
+    'prefer-const': 'off'
   },
   settings: {
     react: {

packages/apputils/src/clipboard.ts

@@ -103,5 +103,5 @@ namespace Private {
   /**
    * The application clipboard instance.
    */
-  export const instance = new MimeData();
+  export let instance = new MimeData();
 }

packages/console/src/panel.ts

@@ -283,7 +283,7 @@ namespace Private {
   /**
    * The counter for new consoles.
    */
-  export const count = 1;
+  export let count = 1;
 
   /**
    * Update the title of a console panel.

packages/docmanager-extension/src/index.ts

@@ -832,7 +832,7 @@ namespace Private {
   /**
    * A counter for unique IDs.
    */
-  export const id = 0;
+  export let id = 0;
 
   export function createRevertConfirmNode(
     checkpoint: Contents.ICheckpointModel,

packages/launcher-extension/src/index.ts

@@ -94,5 +94,5 @@ namespace Private {
   /**
    * The incrementing id used for launcher widgets.
    */
-  export const id = 0;
+  export let id = 0;
 }

packages/terminal/src/widget.ts

@@ -362,7 +362,7 @@ namespace Private {
   /**
    * An incrementing counter for ids.
    */
-  export const id = 0;
+  export let id = 0;
 
   /**
    * The light terminal theme.