npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: socket@1.0.0
npm ERR! Found: webpack@4.46.0
npm ERR! node_modules/webpack
npm ERR!   webpack@"^4.46.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer webpack@"^2.2.0 || ^3.0.0" from webpack-dev-server@2.9.7
npm ERR! node_modules/webpack-dev-server
npm ERR!   dev webpack-dev-server@"2.9.7" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See D:\Program Files\node.js\node_cache\eresolve-report.txt for a full report.

解决：

// 降低npm版本
npm install npm@3.8.6 -g