我正在将我的angular 4管理项目迁移到7，并且在迁移后收到此错误。该项目在version4上正常运行。任何帮助将不胜感激，我坚持了几天。
TypeError:
Cannot read property 'prototype' of undefined
at __extends (/var/www/html/ifta_7/admin/node_modules/ngc-webpack/src/webpack-chain-module-resolution-host-adapter.js:5:69)
devDependancy:{
"webpack": "2.3.3",
"webpack-dev-middleware": "1.10.1",
"webpack-dev-server": "2.4.2",
"webpack-dll-bundles-plugin": "1.0.0-beta.5",
"webpack-merge": "4.1.0",
}
"ngc-webpack": "^1.2.0"
I have tried to upgrade version of ngc-webpack to 4.But then getting error @ngtools/webpack not found