Most of us who have read the release blog for Angular 6 must be quite excited about the ng update command that was just introduced. But how does it cope with our existing project?

Initially, I was quite surprised that ng update could easily upgrade my Dotnet Core 2.1 RC Angular SPA template without any hitch, except the fact I need to install typescript version 2.7.2 as one of the pre-requisite. Then the ng update @angular/cli blew my mind too, as it automatically converts my angular-cli.json and its content into the new angular.json with the new structure. Alas, the excitement didn't last long. I decided to give my existing project a try for ng update. The result? Unsatisfying.

Imagine that you're a kid in the first few queues in the front of a candy shop. Right at 10 AM sharp, the store is open. One by one people entered and brought out a bag of candies that you've been waiting for. Once you're in front of the door, you are not allowed to enter, because you have to be older than your age, have a certain height and weight requirements. That is how it feels when you realised that there are so many restrictions that prevent your ng update from working. Below is a snippet of my ng update command.

C:\source\upgrade-sample (master -> origin)
λ ng update
    We analyzed your package.json, there are some packages to update:

      Name                               Version                  Command to update
     --------------------------------------------------------------------------------
      @angular/core                      5.2.2 -> 6.0.1           ng update @angular/core
      rxjs                               5.5.2 -> 6.1.0           ng update rxjs


    There might be additional packages that are outdated.
    Or run ng update --all to try to update all at the same time.


C:\source\upgrade-sample (master -> origin)
λ ng update --all
                  Package "karma-jasmine-html-reporter" has a missing peer dependency of "jasmine" @ ">=3".
                  Package "bootstrap" has a missing peer dependency of "jquery" @ "1.9.1 - 3".
                  Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.7.2 <2.8", would install "2.8.3").
                  Package "@ng-idle/core" has an incompatible peer dependency to "@angular/common" (requires "^4.0.0 || ^5.0.0", would install "6.0.1")
                  Package "@ngrx/router-store" has an incompatible peer dependency to "@angular/common" (requires "^5.0.0", would install "6.0.1")
                  Package "@ng-idle/keepalive" has an incompatible peer dependency to "@angular/common" (requires "^4.0.0 || ^5.0.0", would install "6.0.1")
                  Package "@ngrx/store-devtools" has an incompatible peer dependency to "rxjs" (requires "^5.5.0", would install "6.1.0")
                  Package "@ngrx/store" has an incompatible peer dependency to "@angular/core" (requires "^5.0.0", would install "6.0.1")
Invalid range: ">=6.0.0-rc.0"

Looking at the snippet, I sort of realised that I will end up updating my package manually and one-by-one. Such a tedious task.
Nevertheless, I believe one-day ng update command will be very smart that it will be able to check all package dependencies and update the package.json smartly.