npm_and_yarn in /YTVidShareFrontEnd/ytvidshare for flatted, nth-check, postcss, webpack-dev-server, webpack-dev-server - Update #1286873821

npm_and_yarn in /YTVidShareFrontEnd/ytvidshare for flatted, nth-check, postcss, webpack-dev-server, webpack-dev-server - Update #1286873821 #80