9

所以我升级到 Angular 4+，这样我就可以利用通用包进行服务器端渲染，以达到 SEO 的目的。我在现有的 Angular 2+ 项目中通过将其升级到 Angular 4+ 来实现这一点，并从https://github.com/evertonrobertoauler/cli-universal-demo/commit/a2610286bd3db5d4f4cce4318d7c220c11963eb6进行了所有必要的配置。

我使用 ng-bootstrap https://ng-bootstrap.github.io/#/home (v1.0.0-alpha.22) 只有一个区别。但是当我使用npm run start-u-dev运行节点服务器时，我在 ng-bootstrap 中遇到 import 关键字的错误。

app-ui@0.0.0 start-u-dev /Users/giric/Projects/apnaDoctor/webapp/appUI  
ts-node src/server.ts  

/appUI/node_modules/@ng-bootstrap/ng-bootstrap/accordion/accordion.module.js:1
(function (exports, require, module, __filename, __dirname) { import { NgModule } from '@angular/core';  
                                                              ^^^^^^  
SyntaxError: Unexpected token import  
    at createScript (vm.js:53:10)  
    at Object.runInThisContext (vm.js:95:10)  
    at Module._compile (module.js:543:28)  
    at Object.Module._extensions..js (module.js:580:10)  
    at Module.load (module.js:488:32)  
    at tryModuleLoad (module.js:447:12)  
    at Function.Module._load (module.js:439:3)  
    at Module.require (module.js:498:17)  
    at require (internal/module.js:20:19)  
    at Object.<anonymous> (/appUI/dist/ngfactory/src/app/app.server.module.ngfa
ctory.ts:18:1)  
    at Module._compile (module.js:571:32)  
    at Module.m._compile (/appUI/node_modules/ts-node/src/index.ts:406:23)  
    at Module._extensions..js (module.js:580:10)  
    at Object.require.extensions.(anonymous function) [as .ts]
(/webapp/appUI/node_mod
ules/ts-node/src/index.ts:409:12)  
    at Module.load (module.js:488:32)  

pm ERR! Darwin 16.6.0  
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "start-u-dev"  
npm ERR! node v7.7.4  
npm ERR! npm  v4.1.2  
npm ERR! code ELIFECYCLE  
npm ERR! app-ui@0.0.0 start-u-dev: `ts-node src/server.ts`  
npm ERR! Exit status 1  
npm ERR!  
npm ERR! Failed at the app-ui@0.0.0 start-u-dev script 'ts-node src/server.ts'.  
npm ERR! Make sure you have the latest version of node.js and npm installed.  
npm ERR! If you do, this is most likely a problem with the app-ui package,  
npm ERR! not with npm itself.  
npm ERR! Tell the author that this fails on your system:  
npm ERR!     ts-node src/server.ts  
npm ERR! You can get information on how to open an issue for this project with:  
npm ERR!     npm bugs app-ui  
npm ERR! Or if that isn't available, you can get their info via:  
npm ERR!     npm owner ls app-ui  
npm ERR! There is likely additional logging output above.  

npm ERR! Please include the following file with any support request:

这就是我的 package.json 的样子

{  
  "name": "app-ui",  
  "version": "0.0.0",  
  "license": "MIT",  
  "scripts": {  
    "ng": "ng",  
    "start": "ng serve",  
    "build": "ng build",  
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "prestart": "npm install",
    "postinstall": "bower install",
    "prestart-u-dev": "npm install && ng build && ngc",
    "start-u-dev": "ts-node src/server.ts",
    "prestart-u-prod": "npm install && ng build --prod && ngc",
    "start-u-prod": "ts-node src/server.ts"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.0.1",
    "@angular/cli": "^1.0.0-rc.1",
    "@angular/common": "^4.0.1",
    "@angular/compiler": "^4.0.1",
    "@angular/compiler-cli": "^4.0.1",
    "@angular/core": "^4.0.1",
    "@angular/forms": "^4.0.1",
    "@angular/http": "^4.0.1",
    "@angular/platform-browser": "^4.0.1",
    "@angular/platform-browser-dynamic": "^4.0.1",
    "@angular/platform-server": "^4.0.1",
    "@angular/router": "^4.0.1",
    "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.22",
    "angular2-toaster": "^3.0.1",
    "core-js": "^2.4.1",
    "ng2-webstorage": "^1.5.1",
    "rxjs": "^5.1.0",
    "rxjs-es": "^5.0.0-beta.12",
    "typescript": "^2.2.2",
    "ui-router-ng2": "^1.0.0-beta.4",
    "zone.js": "^0.7.6"
  },
  "devDependencies": {
    "@types/jasmine": "2.5.38",
    "@types/node": "~6.0.60",
    "codelyzer": "~2.0.0",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "node-sass": "^4.5.0",
    "protractor": "~5.1.0",
    "raw-loader": "^0.5.1",
    "sass-loader": "^6.0.3",
    "ts-node": "~2.0.0",
    "tslint": "~4.4.2"
  }
}

更新：早些时候我删除了angular2-toaster，但后来我再次添加它只是为了确保它不仅仅是抛出相同错误的烤面包机模块。事实证明，angular2-toaster 和 ng-bootstrap 都抛出了同样的错误。

更新 2：当我使用ng server运行服务器时，它工作正常，使用 ng-bootstrap 和 angular2-toaster 与 angular 4+ 没有问题

有什么建议么？提前致谢。

4

3 回答 3

7

对于那些试图了解解决方案是什么的人，您基本上想要使用和白名单angular2-toaster以及其他给出此问题的模块。

  1. 如果使用 angular-cli，请使用ng eject创建一个webpack.config.js

  2. 通过安装webpack-node-externals依赖项并在文件npm install中添加以下行webpack.config.js

    const nodeExternals = require('webpack-node-externals');

module.exports = {
  ...
  target: 'node',
  externals: [nodeExternals({
    whitelist: [
      /^@ng-bootstrap\/ng-bootstrap/,
      /^angular2\-toaster/,
    ]
  })],
  ...
}
于 2017-07-11T01:05:09.493 回答
0

这显然是一个构建问题 - 您似乎没有为您的服务器端代码设置适当的转译设置。请注意，ng-bootstrap（与任何其他 Angular 2.x+ 库一样！）以下列方式发布代码：

  • 未捆绑的 ES2015 代码（带导入）
  • UMD 捆绑的 ES5 代码（无导入）

如果您想在服务器上运行 ng-bootstrap，您有 2 个选择：设置正确的转译管道并使用未捆绑的代码或从捆绑包中导入（位于bundles文件夹中）。

如果您决定使用 ES5 捆绑方法，您应该从 ) 导入@ng-bootstrap/ng-bootstrap/dist/ng-bootstrap而不是仅导入@ng-bootstrap/ng-bootstrap)。但要明确的是，我不推荐它，因为您必须在服务器端和客户端代码中有不同的导入。

于 2017-04-03T12:11:22.000 回答
-1

我认为您可以创建两个模块。一种是浏览器导入ng-bootstrap，一种是服务器未导入ng-bootstrap。我认为您必须再创建一个通用模块来共享组件、浏览器模块和服务器模块的服务。模态不会由服务器呈现给 SEO。

于 2017-04-14T17:06:41.437 回答