我的应用程序在使用时构建和运行良好，ng serve但在使用ng build --prod. 该错误在依赖项下，/node_modules/因此不确定如何解决此问题？
错误信息：
ERROR in Unexpected value 'undefined' imported by the module 'ExampleModule in /Users/Projects/KagiDocs/git/core/node_modules/@angular/material-examples/examples_public_index.d.ts'
包.json
...
"private": true,
"dependencies": {
"@angular/animations": "^8.0.0",
"@angular/cdk": "^8.1.4",
"@angular/cdk-experimental": "^8.1.1",
"@angular/common": "^8.0.0",
"@angular/compiler": "^8.0.0",
"@angular/core": "^8.0.0",
"@angular/forms": "^8.0.0",
"@angular/material": "^8.1.4",
"@angular/material-examples": "angular/material2-docs-content#8.1.x",
"@angular/material-experimental": "^8.1.1",
"@angular/material-moment-adapter": "^8.1.4",
"@angular/platform-browser": "^8.0.0",
"@angular/platform-browser-dynamic": "^8.0.0",
"@angular/router": "^8.0.0",
"core-js": "^2.6.1",
"hammerjs": "^2.0.8",
"material-components-web": "^1.1.1",
"moment": "^2.23.0",
"rxjs": "^6.5.1",
"zone.js": "^0.9.0"
},
"devDependencies": {
"@angular-devkit/build-angular": "^0.800.0",
"@angular/cli": "^8.0.0",
"@angular/compiler-cli": "^8.0.0",
"@types/jasmine": "^3.3.5",
"@types/node": "^10.12.18",
"firebase-tools": "^6.2.2",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "^3.1.4",
"karma-chrome-launcher": "^2.2.0",
"karma-firefox-launcher": "^1.1.0",
"karma-jasmine": "^1.1.2",
"karma-jasmine-html-reporter": "^0.2.2",
"node-sass": "^4.11.0",
"protractor": "~5.3.0",
"ts-node": "^6.0.3",
"tslint": "^5.10.0",
"typescript": "3.4"
}
}
我们已经 。克隆了这个https://github.com/angular/material.angular.io代码库来构建我们的项目。