This a base configuration for Azure DevOps (or TFS or Visual Studio Team Services) extension development with the use of TypeScript and React. It is also configured in a way it can be developed on local machine without uploading every change to the server.
Extension is using official Visual Studio Services Web Extension SDK.
Configure extension to load sources from remote url using baseUri in vss-extension.json with url of your local development server, default https://localhost:3000/.
Configure your local development server to serve resources using https.
Extension must be built using npm run build, packaged npm run package, published to https://marketplace.visualstudio.com/manage/publishers/ a installed to A. Next development can happen on local development app with support of HMR.