package.json:
{ ?"name": "webpack", ?"version": "1.0.0", ?"description": "", ?"main": "webpack.config.js", ?"scripts": { ???"test": "echo \"Error: no test specified\" && exit 1", ???"build": "webpack", ???"start": "webpack-dev-server" ?}, ?"keywords": [], ?"author": "", ?"license": "ISC", ?"dependencies": { ???"jquery": "^3.3.1" ?}, ?"devDependencies": { ???"webpack-dev-server": "^3.1.5" ?}}bogon:webpack cristin$ npm run start
> webpack@1.0.0 start /Users/cristin/Documents/webpack
> webpack-dev-server
module.js:487
???throw err;
???^
Error: Cannot find module ‘webpack‘
???at Function.Module._resolveFilename (module.js:485:15)
???at Function.Module._load (module.js:437:25)
???at Module.require (module.js:513:17)
???at require (internal/module.js:11:18)
???at Object.<anonymous> (/Users/cristin/Documents/webpack/node_modules/webpack-dev-server/lib/Server.js:22:17)
???at Module._compile (module.js:569:30)
???at Object.Module._extensions..js (module.js:580:10)
???at Module.load (module.js:503:32)
???at tryModuleLoad (module.js:466:12)
???at Function.Module._load (module.js:458:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! webpack@1.0.0 start: `webpack-dev-server`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the webpack@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! ????/Users/cristin/.npm/_logs/2018-07-23T03_08_57_715Z-debug.log
bogon:webpack cristin$ sudo npm install webpack-dev-server
Password:
npm WARN webpack-dev-server@3.1.5 requires a peer of webpack@^4.0.0-beta.1 but none is installed. You must install peer dependencies yourself.
npm WARN webpack-dev-middleware@3.1.3 requires a peer of webpack@^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN webpack@1.0.0 No description
npm WARN webpack@1.0.0 No repository field.
+ webpack-dev-server@3.1.5
updated 2 packages in 12.044s
bogon:webpack cristin$
webpack 4.X npm run start 报错
原文地址：https://www.cnblogs.com/cristin/p/9353656.html