Update CLI to 4 ok?

@kenw232 wrote:

I’m using Ionic 3. “ionic -v = 3.20.0”. I see there is a v4.2.1 for the CLI available now.
“The Ionic CLI has an update available (3.20.0 => 4.2.1)! Would you like to install it? (Y/n)”

If I do this update is it 100% transparent? or will I have to fix/change my code for my apps because it will break many different things?

thanks.

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