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There's no ng remove command. Schematics are written by the developers of the package.
You can look into the package's schematic declaration to find out what files are modified.
As of now there's no way to automatically do this.
You can use npm uninstall package-name to remove it from the package.json.
You need to manually remove the package imports from module, component etc
There's issue with discussion on this feature: https://github.com/angular/angular-cli/issues/900