webpack-dev-server トラブルシューティング
webpack-dev-serverで以下のようなエラーが出た場合は、 他に開いているターミナル上で npm start (webpack-dev-server)している可能性がある
> app@0.0.0 start /Users/user/workspace/app > webpack-dev-server --config ./webpack.config.js events.js:160 throw er; // Unhandled 'error' event ^ Error: listen EADDRINUSE 127.0.0.1:8080 at Object.exports._errnoException (util.js:1022:11) at exports._exceptionWithHostPort (util.js:1045:20) at Server._listen2 (net.js:1262:14) at listen (net.js:1298:10) at doListening (net.js:1397:7) at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16) at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! app@0.0.0 start: `webpack-dev-server --config ./config/webpack.config.js` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the app@0.0.0 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/user/.npm/_logs/2017-06-05T09_24_20_493Z-debug.log