使用npm run server 启动webpack-dev-server时报错：
E:\webpack_demo>npm run server > webpacktest@1.0.0 server E:\webpack_demo > webpack-dev-server The CLI moved into a separate package: webpack-cli. Please install 'webpack-cli' in addition to webpack itself to use the CLI. -> When using npm: npm install webpack-cli -D -> When using yarn: yarn add webpack-cli -D module.js:529 throw err; ^ Error: Cannot find module 'webpack-cli/bin/config-yargs' at Function.Module._resolveFilename (module.js:527:15) at Function.Module._load (module.js:476:23) at Module.require (module.js:568:17) at require (internal/module.js:11:18) at Object.<anonymous> (E:\webpack_demo\node_modules\webpack-dev-server\bin\webpack-dev-server.js:65:1) at Module._compile (module.js:624:30) at Object.Module._extensions..js (module.js:635:10) at Module.load (module.js:545:32) at tryModuleLoad (module.js:508:12) at Function.Module._load (module.js:500:3) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! webpacktest@1.0.0 server: `webpack-dev-server` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the webpacktest@1.0.0 server 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! C:\Users\wagon\AppData\Roaming\npm-cache\_logs\2018-03-28T07_39_08_944Z-debug.log原因是找不到webpack-cli这个包，使用npm添加此包即可：
E:\webpack_demo>npm install webpack-cli npm WARN deprecated nomnom@1.8.1: Package no longer supported. Contact support@npmjs.com for more info. npm WARN deprecated babel-preset-es2015@6.24.1: ???? Thanks for using Babel: we recommend using babel-preset-env now: please read babeljs.io/env to update! npm WARN webpacktest@1.0.0 No repository field. npm WARN webpacktest@1.0.0 scripts['server'] should probably be scripts['start']. npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules\fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) + webpack-cli@2.0.13 added 333 packages in 76.978s然后再执行npm run server
E:\webpack_demo>npm run server > webpacktest@1.0.0 server E:\webpack_demo > webpack-dev-server i ｢wds｣: Project is running at http://192.168.3.6:1717/ i ｢wds｣: webpack output is served from / i ｢wds｣: Content not from webpack is served from E:\webpack_demo\dist ‼ ｢wdm｣: Hash: a9eea546fbe29f1fcd52 Version: webpack 4.2.0 Time: 6349ms Built at: 2018-3-28 15:47:09 Asset Size Chunks Chunk Names entry2.js 139 KiB 0 [emitted] entry2 entry.js 139 KiB 1 [emitted] entry Entrypoint entry = entry.js Entrypoint entry2 = entry2.js [3] (webpack)/hot/emitter.js 77 bytes {0} {1} [built] [4] (webpack)/hot/log.js 1.03 KiB {0} {1} [optional] [built] [5] (webpack)/hot sync nonrecursive ^\.\/log$ 170 bytes {0} {1} [built] [8] ./node_modules/html-entities/index.js 231 bytes {0} {1} [built] [10] (webpack)-dev-server/client/overlay.js 3.58 KiB {0} {1} [built] [12] (webpack)-dev-server/client/socket.js 1.05 KiB {0} {1} [built] [13] ./node_modules/loglevel/lib/loglevel.js 7.68 KiB {0} {1} [built] [14] ./node_modules/ansi-regex/index.js 135 bytes {0} {1} [built] [15] ./node_modules/strip-ansi/index.js 161 bytes {0} {1} [built] [22] ./node_modules/url/url.js 22.8 KiB {0} {1} [built] [23] (webpack)-dev-server/client?http://192.168.3.6:1717 7.75 KiB {0} {1} [built] [24] ./src/entry2.js 16 bytes {0} [built] [25] multi (webpack)-dev-server/client?http://192.168.3.6:1717 ./src/entry2.js 40 bytes {0} [built] [26] ./src/entry.js 58 bytes {1} [built] [27] multi (webpack)-dev-server/client?http://192.168.3.6:1717 ./src/entry.js 40 bytes {1} [built] + 13 hidden modules WARNING in configuration The 'mode' option has not been set. Set 'mode' option to 'development' or 'production' to enable defaults for this environment. i ｢wdm｣: Compiled with warnings.