If you get this kind of error Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime (83) or any other kind of gulp build errors, and if its after you upgraded to Node 14.X, and upgraded your YO generator, then its because all the dependencies changed, and you need to migrage. so here is a simple solution: 1. Create a side clean SPFx project (Webpart or Extension (Extension is only with 2019+)) 2. Save somewhere (just in case) the following files package.json, tsconfig.json, package-lock.json 3. Copy from your new project to your old project only 2 files package.json, tsconfig.json * change the name and version of your project in the package.json file 4. Run gulp clean 5. Run npm install 6. Run gulp build ect. Do you need an SPFx Developers? Contact us now!