prevent ng build from overwriting source files

Okay, that one was scarry as hell. I am sooo lucky I pushed my project to GH before building ng sources prepared for prod....

What I did was opening .angular-cli.json and setting
"outDir": "../../",

as I wanted to store built files next to my project so that I could simply exclude project in gradle. Turns out that was a terrible mistake as ng build --prod decided to nuked my whole UI project for good. Yes sir it did. 10 days of work have been completely vanished from my harddrive. Good thing is that I did push it all to git before...

I would strongly suggest to add safety switches preventing self-destruction in the whole ng-cli project.

Start with .angular-cli.json and reproduce the reported ng build --prod behavior using an outDir of ../../. Trace how the Angular CLI handles that output path and define a safety switch that prevents destructive writes outside the project.

Written by the indexing model from the issue text.