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angular - TypeError：对象原型可能只是一个对象或空：未定义的Angular 8

问题描述

每当我尝试启动我的网络应用程序时，都会收到此类型错误。想不通为什么。

更新了一些软件包后，我开始得到它。我不知道哪个是问题所在，也不知道为什么错误指向的代码出错了，因为它是我的 Angular 8 依赖项中的代码。我不确定这个错误到底在告诉我什么。我试图更新所有依赖项。我已经查看了几乎所有类似的问题解决方案，但它们都没有奏效。我不知道它是编译器错误、打字稿还是依赖错误。

错误

[error] TypeError: Object prototype may only be an Object or null: undefined
    at setPrototypeOf (<anonymous>)
    at Object.__extends (C:\Users\leahb\Desktop\NH\NH-Senior-Project\node_modules\tslib\tslib.js:65:9)
    at C:\Users\leahb\Desktop\NH\NH-Senior-Project\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\template.js:115:17

tslib.js at line 65
    (function (exporter) {
        var extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };

        __extends = function (d, b) { 
            extendStatics(d, b); *//saying the error is coming from here*
            function __() { this.constructor = d; }
            d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
        };

包.JSON

{
  "name": "nh",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "heroku-postbuild": "ng build --prod"
  },
  "keywords": [
    "heroku"
  ],
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.6",
    "@angular-devkit/build-angular": "^0.13.0",
    "@angular/animations": "~8.1.2",
    "@angular/common": "~8.1.2",
    "@angular/core": "~8.1.2",
    "@angular/forms": "~8.1.2",
    "@angular/platform-browser": "~8.1.2",
    "@angular/platform-browser-dynamic": "~8.1.2",
    "@angular/router": "~8.1.2",
    "@types/googlemaps": "^3.37.0",
    "core-js": "^2.5.4",
    "font-awesome": "^4.7.0",
    "hammerjs": "^2.0.8",
    "ngx-gallery": "^5.10.0",
    "rxjs": "~6.5.2",
    "tslib": "^1.9.0",
    "zone.js": "^0.9.1"
  },
  "devDependencies": {
    "@angular/cli": "^7.3.9",
    "@angular/compiler": "^7.2.15",
    "@angular/compiler-cli": "^8.1.2",
    "@angular/language-service": "~8.1.2",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.5.0",
    "enhanced-resolve": "^3.3.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "^3.4.5"
  },
  "engines": {
    "node": "10.16.0",
    "npm": "6.9.0"
  }
}

我希望应用程序能够编译、构建和启动。每当我尝试 ng serve、ng test 或 ng build 时，都会出现此错误。

标签： angulartypescript

解决方案

在将 CLI 全局更新到版本 8 后，我的angular@7项目遇到了同样的问题，并通过在我的项目目录中运行以下命令将我的项目中的 angular 升级到最新版本来解决它：

ng update @angular/cli @angular/core

您还可以使用该allow-dirty标志绕过 repo 检查：

ng update @angular/cli @angular/core --allow-dirty

此外，这里提到的升级时还有其他需要注意的事项： https ://update.angular.io/#7.0:8.0

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