Trying to get angular-cli to recognise multiple configurations in angular.json
angular.json
C:\\_dev\\myapp>ng serve --configuration development Configuration
For Angular 2 - 5 refer the article for step by step solution for using Multiple Environment in angular
For Angular 6 use ng serve --configuration=dev
ng serve --configuration=dev
Note: Refer the same article for angular 6 as well. But wherever you find --env instead use --configuration. That's works well for angular 6.
--env
--configuration