ABP CLI generate-proxy command checks if @abp/ng.schematics package was installed

resolves https://github.com/abpframework/abp/issues/5170

framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/GenerateProxyCommand.cs

@@ -2,6 +2,8 @@ using System;
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 using Volo.Abp.Cli.Args;
 using Volo.Abp.Cli.Utils;
 using Volo.Abp.DependencyInjection;
@@ -12,19 +14,50 @@ namespace Volo.Abp.Cli.Commands
     {
         public Task ExecuteAsync(CommandLineArgs commandLineArgs)
         {
-            var angularPath = $"angular.json";
-            if (!File.Exists(angularPath))
+            CheckAngularJsonFile();
+            CheckNgSchematics();
+
+            CmdHelper.RunCmd("npx ng g @abp/ng.schematics:proxy");
+
+            return Task.CompletedTask;
+        }
+
+        private void CheckNgSchematics()
+        {
+            var packageJsonPath = $"package.json";
+
+            if (!File.Exists(packageJsonPath))
             {
                 throw new CliUsageException(
-                           "angular.json file not found. You must run this command in the angular folder." +
-                           Environment.NewLine + Environment.NewLine +
-                           GetUsageInfo()
-                       );
+                                            "package.json file not found" +
+                                            Environment.NewLine +
+                                            GetUsageInfo()
+                );
             }
 
-            CmdHelper.RunCmd("npx ng g @abp/ng.schematics:proxy");
+            var schematicsPackageNode = (string) JObject.Parse(File.ReadAllText(packageJsonPath))["devDependencies"]?["@abp/ng.schematics"];
 
-            return Task.CompletedTask;
+            if (schematicsPackageNode == null)
+            {
+                throw new CliUsageException(
+                                             "\"@abp/ng.schematics\" NPM package should be installed to the devDependencies before running this command!" +
+                                             Environment.NewLine +
+                                             GetUsageInfo()
+                );
+            }
+        }
+
+        private void CheckAngularJsonFile()
+        {
+            var angularPath = $"angular.json";
+            if (!File.Exists(angularPath))
+            {
+                throw new CliUsageException(
+                    "angular.json file not found. You must run this command in the angular folder." +
+                    Environment.NewLine + Environment.NewLine +
+                    GetUsageInfo()
+                );
+            }
         }
 
         public string GetUsageInfo()