我有一个新项目，但是执行 ng serve 时出现错误答案

【问题标题】：I have a new project, but when execute ng serve, I get error我有一个新项目，但是执行 ng serve 时出现错误
【发布时间】：2019-03-07 13:20:20
【问题描述】：

我需要更改此主题，我无法发布新主题。我已经更新了脚本，并安装了新包。我仍然收到错误，但不是我上次发布的错误。

                             _                           _  _
  __ _  _ __    __ _  _   _ | |  __ _  _ __         ___ | |(_)
 / _` || '_ \  / _` || | | || | / _` || '__|_____  / __|| || |
| (_| || | | || (_| || |_| || || (_| || |  |_____|| (__ | || |
 \__,_||_| |_| \__, | \__,_||_| \__,_||_|          \___||_||_|
               |___/
angular-cli: 1.0.0-beta.26
node: 8.12.0
os: linux x64
@angular/animations: 6.1.9
@angular/cdk: 6.4.7
@angular/common: 6.1.9
@angular/compiler: 6.1.9
@angular/core: 6.1.9
@angular/forms: 6.1.9
@angular/http: 6.1.9
@angular/material: 2.0.0-beta.10
@angular/platform-browser: 6.1.9
@angular/platform-browser-dynamic: 6.1.9
@angular/platform-server: 6.1.9
@angular/router: 6.1.9
@angular/compiler-cli: 6.1.9
@ngtools/webpack: 1.10.2

我现在收到此错误。这是我现在不知道如何修复的新错误。

WARNING in ./~/ng2-webstorage/dist/app.js
11:35-46 "export 'OpaqueToken' was not found in '@angular/core'

WARNING in ./~/@angular/material/@angular/material.es5.js
6128:45-70 "export 'ConnectedOverlayDirective' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
13725:44-56 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
15765:42-54 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
16831:48-60 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
17553:48-60 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
18421:48-60 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/@angular/material/@angular/material.es5.js
19726:48-60 "export 'OverlayState' was not found in '@angular/cdk/overlay'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
139:16-23 "export 'trigger' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
140:20-25 "export 'state' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
140:38-43 "export 'style' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
144:20-25 "export 'state' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
144:36-41 "export 'style' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
148:20-30 "export 'transition' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/dropdown/dropdown.ts
148:54-61 "export 'animate' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
53:16-23 "export 'trigger' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
54:20-25 "export 'state' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
54:38-43 "export 'style' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
59:20-25 "export 'state' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
59:36-41 "export 'style' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
64:20-30 "export 'transition' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
64:53-60 "export 'animate' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
65:20-30 "export 'transition' was not found in '@angular/core'

WARNING in ./~/angular2-semantic-ui/components/accordion/accordion_panel.ts
65:53-60 "export 'animate' was not found in '@angular/core'

我找不到这个错误的答案。我希望，我现在能找到答案，所以我可以继续写这个脚本。

【问题讨论】：

您可以尝试npm i 并再试一次吗？看来你反正不在rigth文件夹中
确实用 npm i 再试一次，但结果是同样的错误...

标签： angular webpack angular-cli node-modules

【解决方案1】：

我建议阅读以下内容：

https://www.techiediaries.com/updating-angular-cli-projects/

在此页面上声明：

Angular 6 使用 angular.json 而不是 angular-cli.json。 这可以通过以下方式实现：

ng update @angular/cli

这解决了我的问题。

祝你好运

【讨论】：

我已尝试使用 ng update @angular/cli，现在我收到此错误：此版本的 CLI 仅与 Angular 5.0.0 或更高版本兼容。请访问下面的链接以查找有关如何更新 Angular 的说明。
你需要运行 npm install --save-dev @angular/cli@latest @Niklas
我也试过这个并且得到这个错误Cannot destructure property createHash of 'undefined' or 'null'

【解决方案2】：

Angular 6 寻找 angular.json 而不是 angular-cli.json。

您需要更新您的@angular/cli。添加到上面的答案

我确实使用以下命令更新了所有包并更新了所有依赖项。以消除与其他软件包的所有兼容性问题。

如果您要启动应用程序或演示应用程序，请按照此过程操作。如果您为生产应用执行此操作，请格外小心。

npm install -g npm-check-updates
ncu -u
ng update @angular/cli
npm install

安装 npm-check-updates

npm install -g npm-check-updates

使用 ncu 更新你的 package.json

ncu 用于显示

ncu -u 重写你的 package.json

更新您的 @angular/cli 以修改您的应用程序以与 Angular 6 兼容

ng update @angular/cli

然后运行 npm install 来更新你的包

【讨论】：

【解决方案3】：

重新安装@angular/cli

npm install @angular/cli

【讨论】：

【解决方案4】：

只需使用官方升级指南，它会告诉您需要做什么以满足您自己的特殊需求：

https://update.angular.io/

【讨论】：

【解决方案5】：

这似乎是由于安装了不同版本的 angular-cli 造成的。我刚刚创建了一个新项目，使用 new 命令，然后复制到 src 目录。然后全部编译成功。

    ng new UX7

【讨论】：

【解决方案6】：

在我的情况下，我只需要在删除/重新克隆一个 repo 后关闭/重新打开我的终端。不知道那里发生了什么。

【讨论】：