Javascript onPrepare中未定义量角器浏览器

我正在使用angular 9并尝试设置一些e2e测试。我已经看到了许多onPrepare的例子，在这些例子中，他们可以使用浏览器。甚至他们的注释文档也显示了一个不起作用的示例

你知道为什么浏览器没有定义吗

这是pergrator.config.js

// @ts-check
// Protractor configuration file, see link for more information
// https://github.com/angular/protractor/blob/master/lib/config.ts

const { SpecReporter } = require('jasmine-spec-reporter');
const { browser } = require('protractor');

/**
 * @type { import("protractor").Config }
 */
exports.config = {
  allScriptsTimeout: 11000,
  specs: [
    './src/**/*.e2e-spec.ts'
  ],
  capabilities: {
    browserName: 'chrome'
  },
  directConnect: true,
  baseUrl: 'http://localhost:4200/',
  framework: 'jasmine',
  jasmineNodeOpts: {
    showColors: true,
    defaultTimeoutInterval: 30000,
    print: function() {}
  },
  onPrepare() {
    require('ts-node').register({
      project: require('path').join(__dirname, './tsconfig.json')
    });
    jasmine.getEnv().addReporter(new SpecReporter({ spec: { displayStacktrace: true } }));

    // this code is an example from the documentation of onPrepare
    // but browser is undefined
    return browser.getProcessedConfig().then(function(config) {
      console.log('Executing capability', config.capabilities);
    });
  }
};

这里有一些关于角度的信息

Angular CLI: 9.0.7                                                       
Node: 10.19.0                                                            
OS: win32 x64                                                            
                                                                         
Angular: 9.0.7                                                           
... animations, cli, common, compiler, compiler-cli, core, forms         
... language-service, platform-browser, platform-browser-dynamic         
... router                                                               
Ivy Workspace: Yes                                                       
                                                                         
Package                           Version                                
-----------------------------------------------------------              
@angular-devkit/architect         0.900.7                                
@angular-devkit/build-angular     0.900.7                                
@angular-devkit/build-optimizer   0.900.7                                
@angular-devkit/build-webpack     0.900.7                                
@angular-devkit/core              9.0.7                                  
@angular-devkit/schematics        9.0.7                                  
@ngtools/webpack                  9.0.7                                  
@schematics/angular               9.0.7                                  
@schematics/update                0.900.7                                
rxjs                              6.5.5                                  
typescript                        3.7.5                                  
webpack                           4.41.2                                 
                                                                         

package.json

{
  "name": "myapp3",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~9.0.2",
    "@angular/common": "~9.0.2",
    "@angular/compiler": "~9.0.2",
    "@angular/core": "~9.0.2",
    "@angular/forms": "~9.0.2",
    "@angular/platform-browser": "~9.0.2",
    "@angular/platform-browser-dynamic": "~9.0.2",
    "@angular/router": "~9.0.2",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.900.3",
    "@angular/cli": "~9.0.3",
    "@angular/compiler-cli": "~9.0.2",
    "@angular/language-service": "~9.0.2",
    "@types/node": "^12.11.1",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~2.1.0",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.2",
    "protractor": "~5.4.3",
    "ts-node": "~8.3.0",
    "tslint": "~5.18.0",
    "typescript": "~3.7.5"
  }
}

---

之所以发生这种情况，是因为您已从“量角器”导入浏览器，但它未定义。 无需导入，默认情况下，浏览器可在“onPrepare”方法中访问

因此，您需要删除导入，它将起作用

const { browser } = require('protractor'); // This line should be removed