Target Audience	Developer
Technology	Microsoft Teams, SPFx
Read Time	10 minutes
Understand time including reading links	3 hrs

This is Part 1 of a blog post on how to add a tab on a Teams. A lot of this information is on the web, but I've brought a lot of the content into a single place with a GitHub code repository.

On 4 March 2016, news broke that Microsoft had considered bidding $8 billion for Slack, but that Bill Gates was against the purchase, stating that the firm should instead focus on improving Skype for Business, which made total sense as the digital workplace wanted more than just instant messaging and conference calls and $8 billion could be used as a lot of development hours on a massive upgrade to an existing product.

Microsoft has now introduced SharePoint Framework to customize SharePoint for a while and now there's Teams customizations with SharePoint Framework 1.8. So, you can now have your code running in Teams using a Teams Tab.

This blog post explains how to create a SPFx project for Teams

Before you go further read these links:

Background reading: Overview of the SharePoint Framework

Steps To Create Basic SPFx Solution And Deploy On SharePoint Online

Steps to create a SPFx Project

Open the command prompt. Create a directory for SPFx solution.

mkdir TeamsSPFx
cd TeamsSPFx
yo @microsoft/sharepoint
App Name: Hit Enter to have a default name (TeamsSPFx in this case) or type in any other name for your solution.
Target SharePoint: SharePoint Online only (Yes ,I know this is for Teams, but remember the backend for Teams is SharePoint… so makes sense )
Place of files: We may choose to use the same folder
Deployment option: Selecting Y will allow the app to be deployed instantly to all sites and will be accessible everywhere.
Permissions to access web APIs: Choose if the components in the solution require permissions to access web APIs that are unique and not shared with other components in the tenant. Select (N)
Type of client-side component to create: We can choose to create a client-side web part or an extension. Selected WebPart
Web Part Name: teamsWebPart
Web part description: Enter the description but not mandatory.
Framework to use: Select No JavaScript Framework

Yeoman generator will perform a scaffolding process to generate the solution.

Open the solution in the VS code editor.

SharePoint Framework 1.8 will come up with teams tab with default configurations to make use of the default image of our teams tab.

In order to make user of Teams in SharePoint Framework we need to include it in manifest.josn file.

Open manifest.josn file and add "TeamsTab" next to SharePoint WebPart in SuppotedHosts.

Add code below in the webpart.ts files

import * as microsoftTeams from '@microsoft/teams-js';
In a class, define a variable to store Microsoft Teams context.
private teamsContext: microsoftTeams.Context;
Add the onInit() method to set the Microsoft Teams context.

Update the Render Method as below.

With the Project is done

Let's start Deployment process

Bundle the solution run gulp bundle --ship
Package the solution run gulp package-solution --ship
Navigate to the solution and copy spfx-teams-wepart.sppkg file from SharePoint folder.
Add this into the Appcatlog of your tenant.

Use the App Catalog to make custom business apps available for your SharePoint Online environment

Make sure you Check "Make this solution available to all sites in the organization" option.
Once you added your sppkg file
click
sync this to teams tab from the ribbon as shown below.

Once it has done open you teams and navigate to the team where you wanted to add this teams tab.

Click on the + icon and a dialog will open up with Add a tab title.

Select the Teams WebPart with your title from the list of app has and click it.it will open a new dialog as show below and click install to add it.