Update: With Angular 6.0.0 the filename is changed from .angular-cli.json to angular.json.
.angular-cli.json is a hidden file since @angular/cli version 1.0.
The file got the prefix . with this version 1.0 , so it is hidden as @JB Nizet commented.
The change is described in the wiki of @angular/cli stories 1.0 update
The location of this file is unchanged.
When you create a new project with @angular/cli 1.0.2, the message
create .angular-cli.json
is displayed.