Error: Cannot find module 'webpack'

INFO  Starting development server...
ERROR  Error: Cannot find module 'webpack'
Error: Cannot find module 'webpack'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
    at Function.Module._load (internal/modules/cjs/loader.js:508:25)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at Object.<anonymous> (/Users/mapbar_front/Desktop/myself/item-code/g6/antv-g6/node_modules/webpack-dev-server/lib/Server.js:23:17)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

解决方案：

npm link webpack

参考文档：
Error: Cannot find module ‘webpack’错误解决