Resolved #3963: Create a jstree package & bundle contributor.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Packages/Volo/Abp/AspNetCore/Mvc/UI/Packages/JsTree/JQueryFormScriptContributor.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+using Volo.Abp.AspNetCore.Mvc.UI.Bundling;
+using Volo.Abp.AspNetCore.Mvc.UI.Packages.JQuery;
+using Volo.Abp.Modularity;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Packages.JsTree
+{
+    [DependsOn(typeof(JQueryScriptContributor))]
+    public class JsTreeScriptContributor : BundleContributor
+    {
+        public override void ConfigureBundle(BundleConfigurationContext context)
+        {
+            context.Files.AddIfNotContains("/libs/jstree/jstree.min.js");
+        }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Packages/Volo/Abp/AspNetCore/Mvc/UI/Packages/JsTree/JsTreeOptions.cs

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+namespace Volo.Abp.AspNetCore.Mvc.UI.Packages.JsTree
+{
+    public class JsTreeOptions
+    {
+        /// <summary>
+        /// Path of the style file for the JsTree library.
+        /// Setting to null ignores the style file.
+        /// 
+        /// Default value: "/libs/jstree/themes/default/style.min.css".
+        /// </summary>
+        public string StylePath { get; set; } = "/libs/jstree/themes/default/style.min.css";
+    }
+}

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Packages/Volo/Abp/AspNetCore/Mvc/UI/Packages/JsTree/JsTreeStyleContributor.cs

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+using System;
+using System.Collections.Generic;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+using Volo.Abp.AspNetCore.Mvc.UI.Bundling;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Packages.JsTree
+{
+    public class JsTreeStyleContributor : BundleContributor
+    {
+        public override void ConfigureBundle(BundleConfigurationContext context)
+        {
+            var options = context
+                .ServiceProvider
+                .GetRequiredService<IOptions<JsTreeOptions>>()
+                .Value;
+
+            if (options.StylePath.IsNullOrEmpty())
+            {
+                return;
+            }
+
+            context.Files.AddIfNotContains(options.StylePath);
+        }
+    }
+}

npm/packs/jstree/abp.resourcemapping.js

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+module.exports = {
+    mappings: {
+        "@node_modules/jstree/dist/**/*.*": "@libs/jstree/"
+    }
+}

npm/packs/jstree/package.json

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+{
+  "version": "2.7.0",
+  "name": "@abp/jstree",
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@abp/jquery": "^2.7.0",
+    "jstree": "^3.3.9"
+  },
+  "gitHead": "0ea3895f3b0b489e3ea81fc88f8f0896b22b61bd"
+}