Question

在将某些Angular软件包（从4升级到5）之后，同事遇到以下问题：

Cannot read property 'write' of undefined
TypeError: Cannot read property 'write' of undefined
   at UI.write (C:\Workspace\MyAngularApp\MyAngularApp.Web\node_modules\@angular\cli\ember-cli\lib\ui\index.js:56:23)
   at UI.writeLine (C:\Workspace\MyAngularApp\MyAngularApp.Web\node_modules\@angular\cli\ember-cli\lib\ui\index.js:69:8)
   at Class.run (C:\Workspace\MyAngularApp\MyAngularApp.Web\node_modules\@angular\cli\tasks\serve.js:237:12)
   at check_port_1.checkPort.then.port (C:\Workspace\MyAngularApp\MyAngularApp.Web\node_modules\@angular\cli\commands\serve.js:123:26)
   at <anonymous>
   at process._tickCallback (internal/process/next_tick.js:188:7)

这个问题是无法理解的，因为我没有这个问题，并且在VSTS中构建也很成功：（

这是package.json（从4.3.6升级后）：

    "dependencies": {
        "@angular-devkit/core": "0.6.8",
        "@angular/animations": "5.2.9",
        "@angular/common": "5.2.9",
        "@angular/compiler": "5.2.9",
        "@angular/core": "5.2.9",
        "@angular/forms": "5.2.9",
        "@angular/http": "5.2.9",
        "@angular/platform-browser": "5.2.9",
        "@angular/platform-browser-dynamic": "5.2.9",
        "@angular/router": "5.2.9",
        "@ngx-translate/core": "8.0.0",
        "@ngx-translate/http-loader": "1.0.2",
        "angular-azure-blob-service": "1.0.0",
        "angular-sortablejs": "2.0.6",
        "angular2-fontawesome": "5.2.1",
        "angular2-multiselect-dropdown": "2.4.0",
        "bootstrap": "4.1.1",
        "copy-webpack-plugin": "4.3.1",
        "core-js": "2.5.0",
        "font-awesome": "4.7.0",
        "jquery": "^3.3.1",
        "lightbox2": "2.10.0",
        "lodash": "4.17.4",
        "moment": "2.20.1",
        "ng2-completer": "1.6.1",
        "ng5-breadcrumb": "0.0.6",
        "ngx-bootstrap": "^3.0.1",
        "ngx-chips": "^1.9.2",
        "popper.js": "^1.14.3",
        "rxjs": "5.5.8",
        "sortablejs": "1.6.0",
        "tether": "^1.4.4",
        "zone.js": "0.8.23"
      },
      "devDependencies": {
        "@angular/cli": "1.7.4",
        "@angular/compiler-cli": "^5.2.9",
        "@types/jasmine": "2.5.54",
    "@types/node": "8.0.25",
    "codelyzer": "4.0.2",
    "jasmine-core": "2.8.0",
    "jasmine-spec-reporter": "4.2.1",
    "karma": "1.7.0",
    "karma-chrome-launcher": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-coverage-istanbul-reporter": "1.3.0",
    "karma-jasmine": "1.1.0",
    "karma-jasmine-html-reporter": "0.2.2",
    "protractor": "5.1.2",
    "ts-node": "3.3.0",
    "tslint": "5.8.0",
    "typescript": "~2.8.1"
  }

我的同事在尝试安装与我的版本（1.7.4）相同的版本之前，已经在@ angular / cli 6.0.x之前安装了alpha版本，这可能是个线索吗？

环境： @角度/ cli：1.7.4 节点：8.9.4 npm：6.1.0

Answer 1

发现了：D

我们必须全局卸载@ angular / cli，然后再次安装它：P

使用的命令：

npm卸载-g @ angular / cli
npm安装npm
删除package-lock.json（版权：@PierreDuc）
npm安装
npm install -g @ angular / cli
ng服务

享受：）

为什么不将Angular直接设为6？因为有一些与RxJS相关的重大更改，但是，是的，我们期待将其更新到Angular6。

是的，您说的对@Ploppy;）（使用update.angular.io）

Answer 2

我和moueidat处于同一位置，并设法使用node-modules文件夹中的angular-cli二进制文件使其工作：

node.exe .\node_modules\@angular\cli\bin\ng serve

Answer 3

我认为这与最新的@ angular / cli版本有关。检查您的全局版本是否与您的同事不同。

我也遇到了同样的问题，但这是因为我的全局角版本为6.1.1，当我恢复为6.0.0时就可以了。

Angular CLI：无法读取未定义的属性“写入”

3 个答案: