Webpack reported an error and asked for help.

  node.js, question
WARNING in (webpack)-dev-server/~/express/lib/view.js
 Critical dependencies:
 76:29-56 the request of a dependency is an expression
 @ (webpack)-dev-server/~/express/lib/view.js 76:29-56
 
 WARNING in (webpack)/~/watchpack/~/chokidar/lib/fsevents-handler.js
 Module not found: Error: Cannot resolve module 'fsevents' in /home/tigerb/github/easy-vue/node_modules/webpack/node_modules/watchpack/node_modules/chokidar/lib
 @ (webpack)/~/watchpack/~/chokidar/lib/fsevents-handler.js 8:13-32
 
 ERROR in (webpack)-dev-server/lib/Server.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/lib
 @ (webpack)-dev-server/lib/Server.js 1:9-22
 
 ERROR in (webpack)-dev-server/~/serve-index/index.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/node_modules/serve-index
 @ (webpack)-dev-server/~/serve-index/index.js 20:9-22
 
 ERROR in (webpack)-dev-server/~/sockjs/lib/sockjs.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/node_modules/sockjs/lib
 @ (webpack)-dev-server/~/sockjs/lib/sockjs.js 35:7-20
 
 ERROR in (webpack)-dev-server/~/webpack-dev-middleware/~/mime/mime.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/node_modules/webpack-dev-middleware/node_modules/mime
 @ (webpack)-dev-server/~/webpack-dev-middleware/~/mime/mime.js 2:9-22
 
 ERROR in (webpack)/package.json
 Module parse failed: /home/tigerb/github/easy-vue/node_modules/webpack/package.json Line 2: Unexpected token :
 You may need an appropriate loader to handle this file type.
 | {
 | "name": "webpack",
 | "version": "1.12.12",
 | "author": {
 @ (webpack)/lib/Stats.js 135:16-42
 
 ERROR in (webpack)-dev-server/~/sockjs/lib/webjs.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/node_modules/sockjs/lib
 @ (webpack)-dev-server/~/sockjs/lib/webjs.js 9:7-20
 
 I reported this
 Wrong?
 ERROR in (webpack)-dev-server/~/express/lib/request.js
 Module not found: Error: Cannot resolve module 'net' in /home/tigerb/github/easy-vue/node_modules/webpack-dev-server/node_modules/express/lib
 @ (webpack)-dev-server/~/express/lib/request.js 18:11-25
 
 ERROR in (webpack)/~/uglify-js/tools/node.js
 Module not found: Error: Cannot resolve module 'fs' in /home/tigerb/github/easy-vue/node_modules/webpack/node_modules/uglify-js/tools
 @ (webpack)/~/uglify-js/tools/node.js 2:9-22

I feel that you are packing the server code and introducing fs module