在 ng build --prod 之后，为啥我在 main.js:1 和 polyfills.js:1 中出现错误，而不是在我创建的组件中，如何撤消这个？

Posted 2023-03-15

【中文标题】在 ng build --prod 之后，为啥我在 main.js:1 和 polyfills.js:1 中出现错误，而不是在我创建的组件中，如何撤消这个？

【英文标题】：After ng build --prod, why am I getting errors in main.js:1 and polyfills.js:1, rather than in components that I created, How to undo this?在 ng build --prod 之后，为什么我在 main.js:1 和 polyfills.js:1 中出现错误，而不是在我创建的组件中，如何撤消这个？

【发布时间】：2021-08-06 15:05:04

【问题描述】：

我想部署一个几乎完成的 Angular 项目，为了部署，我执行了 ng build --prod。它创建了一个比我部署到服务器的 dist。一切都明白了，到这里为止，但是现在当我更改项目中的内容并执行“ng serve -o”时，我看不到我在编写这些 console.log 消息的那些组件中设置的控制台消息，而是这些被引用来自“main.js:1”和“polyfills.js:1”。

我仍然收到这些控制台消息，但我不知道它在控制台上打印在哪个组件中。

ERROR TypeError: Cannot read property 'UserzAccessStatus' of undefined
    at main.js:1
    at i.<computed> (polyfills.js:1)
    at e.invokeTask (polyfills.js:1)
    at Object.onInvokeTask (main.js:1)
    at e.invokeTask (polyfills.js:1)
    at t.runTask (polyfills.js:1)
    at t.invokeTask (polyfills.js:1)
    at invoke (polyfills.js:1)
    at r.args.<computed> (polyfills.js:1)

chrome 控制台中的Console.log() 消息

package.json 文件

  "name": "gbcl",
  "version": "0.0.0",
  "scripts": 
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "start:server": "nodemon server.js"
  ,
  "private": true,
  "dependencies": 
    "@angular/animations": "~12.0.0",
    "@angular/common": "~12.0.0",
    "@angular/compiler": "~12.0.0",
    "@angular/core": "~12.0.0",
    "@angular/forms": "~12.0.0",
    "@angular/platform-browser": "~12.0.0",
    "@angular/platform-browser-dynamic": "~12.0.0",
    "@angular/router": "~12.0.0",
    "bcrypt": "^5.0.1",
    "body-parser": "^1.19.0",
    "bootstrap": "^4.5.2",
    "express": "^4.17.1",
    "jquery": "^3.6.0",
    "mongoose": "^5.12.8",
    "mongoose-unique-validator": "^2.0.3",
    "popper.js": "^1.16.1",
    "rxjs": "~6.5.3",
    "tslib": "^2.2.0",
    "zone.js": "~0.11.4"
  ,
  "devDependencies": 
    "@angular-devkit/build-angular": "~12.0.0",
    "@angular/cli": "^12.0.0",
    "@angular/compiler-cli": "^12.0.0",
    "@types/jasmine": "~3.7.2",
    "@types/jasminewd2": "~2.0.9",
    "@types/node": "^15.0.3",
    "codelyzer": "^6.0.2",
    "jasmine-core": "~3.7.1",
    "jasmine-spec-reporter": "~7.0.0",
    "karma": "~6.3.2",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~3.0.3",
    "karma-jasmine": "~4.0.1",
    "karma-jasmine-html-reporter": "^1.6.0",
    "nodemon": "^2.0.7",
    "protractor": "~7.0.0",
    "ts-node": "~9.1.1",
    "tslint": "~6.1.0",
    "typescript": "~4.2.4"
  

tsconfig.app.json 文件

  "extends": "./tsconfig.base.json",
  "compilerOptions": 
    "outDir": "./out-tsc/app",
    "types": []
  ,
  "angularCompilerOptions":
    "enableIvy": true,
    "strictTemplates": true,
    "strictInjectionParameters": true
  ,
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ]

如果需要有关任何文件的更多信息，请询问。

【问题讨论】：

刷新页面时是否还引用main.js？

是的，每次我刷新它都是指 main.js

【参考方案1】：

在生产环境中查看错误的确切位置

ng build --prod --build-optimizer --sourceMap=true 你可以得到构建。

您的错误很可能是“?????????”您打印的对象名称中没有"UserzAccessStatus" 键。

【讨论】：

它没有帮助。

【参考方案2】：

您必须根据此回复更新 angular.json 中的服务配置部分

Angular 12 'ng serve' builds apps slowly, almost like production builds