Merge pull request SharePoint#5362 from PrasadKasireddy/PrasadKasireddy-patch-1

Update the type declarations

Author: andrewconnell

docs/spfx/web-parts/get-started/office-addins-tutorial.md

@@ -1,7 +1,7 @@
 ---
 title: Tutorial for creating Outlook Web Access extension using SharePoint Framework
 description: Creating Outlook add-ins using SharePoint Framework
-ms.date: 02/08/2020
+ms.date: 02/19/2020
 ms.prod: sharepoint
 localization_priority: Priority
 ---
@@ -86,7 +86,7 @@ Manifest file contains by default definition to expose your add-in as a tool pan
 In the console, enter the following to install the types for the Office JavaScript SDK from the npm:
 
 ```shell
-npm install @types/office-js
+npm install @types/office-js --save-dev
 ```
 
 This adds the needed intelligence for the Office JavaScript SDK types when you develop your solution in TypeScript.

docs/spfx/web-parts/guidance/use-existing-javascript-libraries.md

@@ -1,7 +1,7 @@
 ---
 title: Use existing JavaScript libraries in SharePoint Framework client-side web parts
 description: Ensure that your web parts won't negatively impact the performance of SharePoint pages that they are being used on.
-ms.date: 01/29/2018
+ms.date: 02/19/2020
 ms.prod: sharepoint
 localization_priority: Priority
 ---
@@ -24,7 +24,7 @@ The most common way of referencing existing JavaScript libraries in SharePoint F
 2. To use Angular with TypeScript, you would install typings using **npm**:
 
   ```sh
-  npm install @types/angular --save
+  npm install @types/angular --save-dev
   ```
 
 3. Reference Angular in your web part by using the `import` statement:
@@ -97,7 +97,7 @@ Referencing existing JavaScript libraries in the SharePoint Framework is easy an
 Using Angular as an example, to reference it as an external resource in your client-side web part, you start by installing its TypeScript typings using **npm**:
 
 ```sh
-  npm install @types/angular --save
+  npm install @types/angular --save-dev
 ```
 
 <br/>