包“@angular/core”不是依赖项。同时将 angular 8 更新为 angular 9

Question

将 angular 8 项目更新为 angular 9 时，出现错误

✔ Package successfully installed.
Using package manager: 'npm'
Collecting installed dependencies...
Found 0 dependencies.
Package '@angular/core' is not a dependency.

我使用的命令

ng update @angular/core@9 @angular/cli@9 --force

Answer 1

运行 命令

npm i

然后就可以了