feat: add exceptions as enum

npm/ng-packs/packages/schematics/src/enums/exception.ts

@@ -0,0 +1,5 @@
+export const enum Exception {
+  InvalidWorkspace = 'Invalid Workspace: The angular.json should be a valid JSON file.',
+  NoProject = 'Unknown Project: Either define a default project in your workspace or specify the project name in schematics options.',
+  NoWorkspace = 'Workspace Not Found: Make sure you are running schematics at the root directory of your workspace and it has an angular.json file.',
+}

npm/ng-packs/packages/schematics/src/enums/index.ts

@@ -0,0 +1 @@
+export * from './exception';