运行命令ionic serve时看到此错误。我用谷歌搜索，但没有解决问题。
我尝试了npm install，npm restart和npm审核修复
Error: Cannot find module 'internal/util/types'
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 evalmachine.<anonymous>:44:31
at Object.<anonymous> (/usr/local/lib/node_modules/ionic/node_modules/ionic-app-lib/node_modules/vinyl-fs/node_modules/graceful-fs/fs.js:11:1)
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)
Cannot find module 'internal/util/types' (CLI v1.7.15)
Your system information:
Cordova CLI: 6.1.1
Gulp version: CLI version 2.0.1
Gulp local: Local version 3.9.1
Ionic Framework Version: 1.1.1
Ionic CLI Version: 1.7.15
Ionic App Lib Version: 0.7.2
ios-deploy version: Not installed
ios-sim version: Not installed
OS: Mac OS X El Capitan
Node Version: v10.15.3
Xcode version: Not installed