Module build failed: Error: You may be using an old version of webpack; please check you're using at least version 4
    at Object.initializeInstance (D:\code\admin\node_modules\_ts-loader@7.0.1@ts-loader\dist\instances.js:175:19)
    at successLoader (D:\code\admin\node_modules\_ts-loader@7.0.1@ts-loader\dist\index.js:27:17)
    at Object.loader (D:\code\admin\node_modules\_ts-loader@7.0.1@ts-loader\dist\index.js:24:5)

找到对应配置

   "ts-loader": "^7.0.1",
    "tslint": "^6.1.1",
    "tslint-config-standard": "^9.0.0",
    "tslint-loader": "^3.5.4",

升级webpack4

npm install webpack webpack-dev-middleware webpack-dev-server webpack-hot-middleware --save-dev