fix(schematics): prevent ng-add from rewriting other workspace cli op…

…tions (#2731)

modules/schematics/src/ng-add/index.ts

@@ -1,25 +1,17 @@
-import {
-  Rule,
-  SchematicContext,
-  Tree,
-  chain,
-  noop,
-} from '@angular-devkit/schematics';
-import {
-  WorkspaceSchema,
-  getWorkspacePath,
-  getWorkspace,
-} from '../../schematics-core/utility/config';
-import { Schema as SchematicOptions } from './schema';
+import {chain, noop, Rule, SchematicContext, Tree,} from '@angular-devkit/schematics';
+import {getWorkspace, getWorkspacePath} from '../../schematics-core';
 
-function updateWorkspace<K extends keyof WorkspaceSchema>(
-  host: Tree,
-  key: K,
-  value: any
-) {
+import {Schema as SchematicOptions} from './schema';
+
+function updateWorkspaceCli(host: Tree, value: any) {
   const workspace = getWorkspace(host);
   const path = getWorkspacePath(host);
-  workspace[key] = value;
+
+  workspace['cli'] = {
+    ...workspace['cli'],
+    ...value
+  };
+
   host.overwrite(path, JSON.stringify(workspace, null, 2));
 }
 
@@ -28,7 +20,7 @@ function setAsDefaultSchematics() {
     defaultCollection: '@ngrx/schematics',
   };
   return (host: Tree) => {
-    updateWorkspace(host, 'cli', cli);
+    updateWorkspaceCli(host, cli);
     return host;
   };
 }