Today after launching of IONIC 4 Beta, I updated my IONIC CLI to 4.0.1. After as i was trying to serve one of my IONIC v1 project using
ionic serve command it was showing below error and warnings to me
ionic-v1 serve --host 0.0.0.0 --port 8100 --lr-port 35729 --dev-port 53703 [v1] 'ionic-v1' is not recognized as an internal or external command, [v1] operable program or batch file.
[INFO] Looks like @ionic/v1-toolkit isn't installed in this project.
This package is required for ionic serve. For more details, please see the CHANGELOG: https://github.com/ionic-team/ionic-cli/blob/master/packages/ionic/CHANGELOG.md#4.0.0
[ERROR] A utility CLI has unexpectedly closed.
The Ionic CLI will exit. Please check any output above for error details.
As suggested in warning [INFO] Looks like @ionic/v1-toolkit isn't installed in this project.
I tried to install @ionic/V1-toolkit using below command and i was able to use ionic serve for my IONIC V1 project from IONIC V4.0.1 CLI.
npm install @ionic/v1-toolkit -g