angular - 无法读取 null TypeError : Cannot read property 的属性 'config'

Question

当我运行这个命令 ng serve 时，我有这个错误，谁能告诉我为什么

Cannot read property 'config' of null TypeError: Cannot read property 'config' of null at Class.run (C:\wamp64\www\back_front\front_end\node_modules\@angular\cli\tasks\serve.js:51:63) at check_port_1.checkPort.then.port (C:\wamp64\www\back_front\front_end\node_modules\@angular\cli\commands\serve.js:123:26) at process._tickCallback (internal/process/next_tick.js:109:7)

Answer 1

当 Angular 找不到 .angular-cli.json 文件时会发生此错误(请注意文件名中有一个点)。通常它是一个隐藏文件。

先尝试以下步骤:

• 删除你的 node_modules 文件夹和 package-lock.json 文件
• npm 安装
• npm 卸载 -g angular-cli
• npm 卸载 -g @angular/cli
• npm install -g @angular/cli
• 服务

如果它仍然产生同样的错误，那么你实际上需要 .angular-cli.json 文件。

默认 .angular-cli.json 文件:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "PROJECT_NAME"
  },
  "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css"
      ],
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json"
    },
    {
      "project": "src/tsconfig.spec.json"
    },
    {
      "project": "e2e/tsconfig.e2e.json"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "css",
    "component": {}
  }
}

注意:这只是一个默认文件，您需要在此文件中配置您的项目设置。