Add project files.

src/modules/Elsa.JavaScript.Libraries/ClientLib/package.json

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+{
+  "name": "javascript",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "build": "npx webpack"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "lodash": "^4.17.21",
+    "moment": "^2.30.1",
+    "terser-webpack-plugin": "^5.3.10",
+    "webpack": "^5.95.0",
+    "webpack-cli": "^5.1.4"
+  }
+}

src/modules/Elsa.JavaScript.Libraries/ClientLib/src/lodash.js

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+module.exports = require('lodash');

src/modules/Elsa.JavaScript.Libraries/ClientLib/src/lodashFp.js

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+module.exports = require('lodash/fp');

src/modules/Elsa.JavaScript.Libraries/ClientLib/src/moment.js

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+module.exports = require('moment');

src/modules/Elsa.JavaScript.Libraries/ClientLib/webpack.config.js

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+const path = require('path');
+const TerserPlugin = require('terser-webpack-plugin');
+
+module.exports = {
+    entry: {
+        lodash: './src/lodash.js',
+        lodashFp: './src/lodashFp.js',
+        moment: './src/moment.js'
+    },
+    output: {
+        filename: '[name].js',
+        path: path.resolve(__dirname, 'dist'),
+        library: '[name]',
+        libraryTarget: 'umd',
+        globalObject: 'this'
+    },
+    optimization: {
+        minimize: true,
+        minimizer: [new TerserPlugin({
+            extractComments: false
+        })],
+    },
+    mode: 'production'
+};

src/modules/Elsa.JavaScript.Libraries/Elsa.JavaScript.Libraries.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <Description>
+            Provides the following JavaScript libraries for Elsa:
+            - lodash
+            - moment
+        </Description>
+        <PackageTags>elsa module expressions scripting javascript libraries</PackageTags>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\common\Elsa.Features\Elsa.Features.csproj" />
+      <ProjectReference Include="..\Elsa.JavaScript\Elsa.JavaScript.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <None Remove="ClientLib\dist\*.js" />
+      <EmbeddedResource Include="ClientLib\dist\*.js">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </EmbeddedResource>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Folder Include="ClientLib\dist\" />
+    </ItemGroup>
+
+</Project>

src/modules/Elsa.JavaScript.Libraries/Elsa.JavaScript.Libraries.csproj.DotSettings

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+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=features/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

src/modules/Elsa.JavaScript.Libraries/Extensions/JavaScriptFeatureExtensions.cs

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+using Elsa.Extensions;
+using Elsa.JavaScript.Features;
+
+namespace Elsa.JavaScript.Libraries.Extensions;
+
+public static class JavaScriptFeatureExtensions
+{
+    /// <summary>
+    /// Adds the Lodash library to the JavaScript engine.
+    /// </summary>
+    public static JavaScriptFeature UseLodash(this JavaScriptFeature feature)
+    {
+        feature.Module.Use<LodashFeature>();
+        return feature;
+    }
+
+    /// <summary>
+    /// Adds the Lodash FP library to the JavaScript engine.
+    /// </summary>
+    public static JavaScriptFeature UseLodashFp(this JavaScriptFeature feature)
+    {
+        feature.Module.Use<LodashFpFeature>();
+        return feature;
+    }
+
+    /// <summary>
+    /// Adds the Moment library to the JavaScript engine.
+    /// </summary>
+    public static JavaScriptFeature UseMoment(this JavaScriptFeature feature)
+    {
+        feature.Module.Use<MomentFeature>();
+        return feature;
+    }
+}

src/modules/Elsa.JavaScript.Libraries/Features/LodashFeature.cs

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+using Elsa.Features.Services;
+
+namespace Elsa.JavaScript.Libraries;
+
+public class LodashFeature(IModule module) : ScriptModuleFeatureBase("lodash", module);

src/modules/Elsa.JavaScript.Libraries/Features/LodashFpFeature.cs

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+using Elsa.Features.Services;
+
+namespace Elsa.JavaScript.Libraries;
+
+public class LodashFpFeature(IModule module) : ScriptModuleFeatureBase("lodashFp", module);

src/modules/Elsa.JavaScript.Libraries/Features/MomentFeature.cs

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+using Elsa.Features.Services;
+
+namespace Elsa.JavaScript.Libraries;
+
+public class MomentFeature(IModule module) : ScriptModuleFeatureBase("moment", module);

src/modules/Elsa.JavaScript.Libraries/Features/ScriptModuleFeatureBase.cs

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+using System.Reflection;
+using Elsa.Extensions;
+using Elsa.Features.Abstractions;
+using Elsa.Features.Attributes;
+using Elsa.Features.Services;
+using Elsa.JavaScript.Features;
+
+namespace Elsa.JavaScript.Libraries;
+
+[DependsOn(typeof(JavaScriptFeature))]
+public abstract class ScriptModuleFeatureBase(string moduleName, IModule module) : FeatureBase(module)
+{
+    public override void Configure()
+    {
+        Module.UseJavaScript(jintOptions =>
+        {
+            jintOptions.ConfigureEngine((engine, context) =>
+            {
+                var resourceName = $"Elsa.JavaScript.Libraries.ClientLib.dist.{moduleName}.js";
+                using var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName)!;
+                using var reader = new StreamReader(stream);
+                var script = reader.ReadToEnd();
+                engine.Execute(script);
+            });
+        });
+    }
+}

src/modules/Elsa.JavaScript.Libraries/FodyWeavers.xml

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+<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
+  <ConfigureAwait />
+</Weavers>