当Angular 2迁移到Angular 4时我得到node_modules / @ angular / core / testing“'没有导出成员'it'和'describe'相同，'expect'
node_modules / @ angular / core / testing“'没有导出成员'it'。
package.json如下所示：
"dependencies": {
"@angular/animations": "4.1.1",
"@angular/common": "4.1.1",
"@angular/compiler": "4.1.1",
"@angular/core": "4.1.1",
"@angular/forms": "4.1.1",
"@angular/http": "4.1.1",
"@angular/platform-browser": "4.1.1",
"@angular/platform-browser-dynamic": "4.1.1",
"@angular/router": "4.1.1",
"@ng-idle/core": "^2.0.0-beta.11",
"@ng-idle/keepalive": "^2.0.0-beta.11",
"@ngrx/core": "1.2.0",
"@ngrx/store": "2.2.1",
"angular2-in-memory-web-api": "0.0.9",
"angular2-moment": "^1.3.3",
"copy-webpack-plugin": "^4.0.1",
"core-js": "2.4.1",
"file-loader": "^0.8.5",
"font-awesome": "4.2.0",
"jquery": "^1.11.0",
"jquery-ui": "1.12.1",
"moment": "2.13.0",
"ng2-translate": "2.5.0",
"ngrx-store-logger": "0.1.6",
"primeng": "4.0.0",
"reflect-metadata": "0.1.3",
"rxjs": "5.0.0-beta.12",
"systemjs": "0.19.27",
"url-loader": "^0.5.8",
"zone.js": "0.6.25"
},
"devDependencies": {
"@types/jasmine": "2.5.38",
"@types/node": "^6.0.45",
"angular2-template-loader": "0.6.2",
"awesome-typescript-loader": "3.1.3",
"codelyzer": "^2.0.0-beta.4",
"css-loader": "^0.24.0",
"exports-loader": "^0.6.4",
"extract-text-webpack-plugin": "^1.0.1",
"file-loader": "^0.8.5",
"html-loader": "^0.4.3",
"jasmine-core": "^2.4.1",
"karma": "^1.2.0",
"karma-jasmine": "^1.0.2",
"karma-phantomjs-launcher": "^1.0.2",
"karma-sourcemap-loader": "^0.3.7",
"karma-webpack": "^1.8.0",
"node-sass": "4.5.0-xentry",
"null-loader": "^0.1.1",
"phantomjs-prebuilt": "^2.1.7",
"raw-loader": "^0.5.1",
"rimraf": "^2.5.2",
"sass-loader": "^4.1.1",
"style-loader": "^0.13.1",
"stylelint-webpack-plugin": "^0.5.1",
"tslint": "^4.3.1",
"tslint-loader": "^3.3.0",
"typescript": "2.3.2",
"url-loader": "^0.5.7",
"webpack": "^1.14.0",
"webpack-dev-server": "^1.16.2",
"webpack-merge": "^0.14.0"
}