feat(schematics): include @ngrx/schematics in ng add command

Assuming a user of the plugin is using it in a project with @ngrx/schematics then there is no benefit.
If a user has not installed @ngrx/schematics then this will protect them from a "collection not found" error.

Author: Peter Smith

libs/ddd/src/schematics/ng-add/index.ts

@@ -1,11 +1,16 @@
-import { 
-  chain, 
-  Rule, 
+import {
+  chain,
+  Rule
 } from '@angular-devkit/schematics';
+import { addDepsToPackageJson } from '@nrwl/workspace';
 import { initLintingRules } from '../rules';
+import { NGRX_VERSION } from '../utils';
 
 export default function(): Rule {
   return chain([
     initLintingRules(),
+    addDepsToPackageJson({
+      '@ngrx/schematics': NGRX_VERSION
+    })
   ]);
 }

libs/ddd/src/schematics/rules/add-ngrx-to-package-json.ts

@@ -3,20 +3,19 @@
  */
 import { Rule } from '@angular-devkit/schematics';
 import { addDepsToPackageJson } from '@nrwl/workspace';
+import { NGRX_VERSION } from '../utils';
 
 /**
  * addNgRxToPackageJson
  * add the ngrx packages to the package.json and install them
  */
 export function addNgRxToPackageJson(): Rule {
-  const ngrxVersion = '10.0.0';
-
   return addDepsToPackageJson(
     {
-      '@ngrx/store': ngrxVersion,
-      '@ngrx/effects': ngrxVersion,
-      '@ngrx/entity': ngrxVersion,
-      '@ngrx/store-devtools': ngrxVersion,
+      '@ngrx/store': NGRX_VERSION,
+      '@ngrx/effects': NGRX_VERSION,
+      '@ngrx/entity': NGRX_VERSION,
+      '@ngrx/store-devtools': NGRX_VERSION,
     },
     {}
   );

libs/ddd/src/schematics/utils/index.ts

@@ -1,6 +1,7 @@
-export * from './read-into-source-file';
 export * from './check-rule-exists';
+export * from './insert';
+export * from './ngrx-version';
+export * from './read-into-source-file';
 export * from './read-workspace-name';
-export * from './validate-inputs';
 export * from './update-dep-const';
-export * from './insert';
+export * from './validate-inputs';

libs/ddd/src/schematics/utils/ngrx-version.ts

@@ -0,0 +1 @@
+export const NGRX_VERSION = '10.1.2';