word-addin if you want to run it from source,you should have OFFICE,and EDGE WebView2(not edge browser) How to Run 1. install yarn install 2. run web server yarn serve 3.run office server yarn run dev 4. use you can use it. Project setup yarn install Compiles and hot-reloads for development yarn serve Compiles and minifies for production yarn build Customize configuration See Configuration Reference.