ionic3 ionic cordova build android --prod 报错 解决方法

Error: Cannot find module "."
at http://localhost:8100/build/vendor.js:1:1009581
at http://localhost:8100/build/vendor.js:1:1009651
at Object.<anonymous> (http://localhost:8100/build/vendor.js:1:1009802)
at e (http://localhost:8100/build/vendor.js:1:101)
at Object.370 (http://localhost:8100/build/main.js:1:158708)
at e (http://localhost:8100/build/vendor.js:1:101)
at window.webpackJsonp (http://localhost:8100/build/vendor.js:1:416)
at http://localhost:8100/build/main.js:1:1

将typescript 从 3.1.1 降级到 2.6.2

"devDependencies": {

"ionic": "4.2.1",

"typescript": "~2.6.2",    

"ws": "6.1.0"

},