No warning about module being imported

module/PowerShellEditorServices/PowerShellEditorServices.psd1

@@ -76,11 +76,7 @@ Copyright = '(c) 2017 Microsoft. All rights reserved.'
 FunctionsToExport = @()
 
 # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.
-CmdletsToExport = @(
-    'Start-EditorServices',
-    '__Invoke-ReadLineForEditorServices',
-    '__Invoke-ReadLineConstructor'
-)
+CmdletsToExport = @('Start-EditorServices')
 
 # Variables to export from this module
 VariablesToExport = @()

src/PowerShellEditorServices.Hosting/Commands/InvokeReadLineConstructorCommand.cs

@@ -12,7 +12,6 @@ namespace Microsoft.PowerShell.EditorServices.Commands
     /// <summary>
     /// The Start-EditorServices command, the conventional entrypoint for PowerShell Editor Services.
     /// </summary>
-    [Cmdlet("__Invoke", "ReadLineConstructor")]
     public sealed class InvokeReadLineConstructorCommand : PSCmdlet
     {
         protected override void EndProcessing()

src/PowerShellEditorServices.Hosting/Commands/InvokeReadLineForEditorServicesCommand.cs

@@ -14,7 +14,6 @@ namespace Microsoft.PowerShell.EditorServices.Commands
     /// <summary>
     /// The Start-EditorServices command, the conventional entrypoint for PowerShell Editor Services.
     /// </summary>
-    [Cmdlet("__Invoke", "ReadLineForEditorServices")]
     public sealed class InvokeReadLineForEditorServicesCommand : PSCmdlet
     {
         private delegate string ReadLineInvoker(

src/PowerShellEditorServices/Server/PsesDebugServer.cs

@@ -12,6 +12,7 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.PowerShell.EditorServices.Handlers;
 using Microsoft.PowerShell.EditorServices.Services;
+using Microsoft.PowerShell.EditorServices.Utility;
 using OmniSharp.Extensions.DebugAdapter.Protocol.Serialization;
 using OmniSharp.Extensions.JsonRpc;
 using OmniSharp.Extensions.LanguageServer.Server;
@@ -28,6 +29,9 @@ internal class PsesDebugServer : IDisposable
         /// </summary>
         private static int s_hasRunPsrlStaticCtor = 0;
 
+        private static readonly Lazy<Type> s_lazyReadLineCmdletType = new Lazy<Type>(() =>
+            Type.GetType("Microsoft.PowerShell.EditorServices.Commands.InvokeReadLineConstructorCommand, Microsoft.PowerShell.EditorServices.Hosting"));
+
         private readonly Stream _inputStream;
         private readonly Stream _outputStream;
         private readonly bool _useTempSession;
@@ -80,8 +84,10 @@ public async Task StartAsync()
                 // This is only needed for Temp sessions who only have a debug server.
                 if (_usePSReadLine && _useTempSession && Interlocked.Exchange(ref s_hasRunPsrlStaticCtor, 1) == 0)
                 {
+                    var command = new PSCommand()
+                        .AddCommand(new CmdletInfo("__Invoke-ReadLineConstructor", s_lazyReadLineCmdletType.Value));
+
                     // This must be run synchronously to ensure debugging works
-                    var command = new PSCommand().AddCommand("__Invoke-ReadLineConstructor");
                     _powerShellContextService
                         .ExecuteCommandAsync<object>(command, sendOutputToHost: true, sendErrorToHost: true)
                         .GetAwaiter()

src/PowerShellEditorServices/Services/PowerShellContext/PowerShellContextService.cs

@@ -740,7 +740,15 @@ public async Task<IEnumerable<TResult>> ExecuteCommandAsync<TResult>(
 
 
                 PowerShell shell = this.PromptNest.GetPowerShell(executionOptions.IsReadLine);
-                shell.Commands = psCommand;
+
+                // Due to the following PowerShell bug, we can't just assign shell.Commands to psCommand
+                // because PowerShell strips out CommandInfo:
+                // https://github.com/PowerShell/PowerShell/issues/12297
+                shell.Commands.Clear();
+                foreach (Command command in psCommand.Commands)
+                {
+                    shell.Commands.AddCommand(command);
+                }
 
                 // Don't change our SessionState for ReadLine.
                 if (!executionOptions.IsReadLine)

src/PowerShellEditorServices/Services/PowerShellContext/Session/PSReadLinePromptContext.cs

@@ -3,18 +3,18 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+using System;
+using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.InteropServices;
+using System.Management.Automation.Runspaces;
 using System.Threading;
 using System.Threading.Tasks;
-using System;
-using System.Management.Automation.Runspaces;
+using Microsoft.Extensions.Logging;
+using Microsoft.PowerShell.EditorServices.Utility;
 
 namespace Microsoft.PowerShell.EditorServices.Services.PowerShellContext
 {
-    using System.Collections.Generic;
     using System.Management.Automation;
-    using Microsoft.Extensions.Logging;
 
     internal class PSReadLinePromptContext : IPromptContext
     {
@@ -44,6 +44,9 @@ internal class PSReadLinePromptContext : IPromptContext
             IsReadLine = true,
         };
 
+        private static readonly Lazy<Type> s_lazyReadLineCmdletType = new Lazy<Type>(() =>
+            Type.GetType("Microsoft.PowerShell.EditorServices.Commands.InvokeReadLineForEditorServicesCommand, Microsoft.PowerShell.EditorServices.Hosting"));
+
         private readonly PowerShellContextService _powerShellContext;
 
         private readonly PromptNest _promptNest;
@@ -129,7 +132,7 @@ public async Task<string> InvokeReadLineAsync(bool isCommandLine, CancellationTo
             }
 
             var readLineCommand = new PSCommand()
-                .AddCommand("__Invoke-ReadLineForEditorServices")
+                .AddCommand(new CmdletInfo("__Invoke-ReadLineForEditorServices", s_lazyReadLineCmdletType.Value))
                 .AddParameter("CancellationToken", _readLineCancellationSource.Token);
 
             IEnumerable<string> readLineResults = await _powerShellContext.ExecuteCommandAsync<string>(

src/PowerShellEditorServices/Utility/PSCommandExtensions.cs

@@ -0,0 +1,32 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Management.Automation;
+using System.Management.Automation.Runspaces;
+using System.Reflection;
+
+namespace Microsoft.PowerShell.EditorServices.Utility
+{
+    internal static class PSCommandExtensions
+    {
+        private static ConstructorInfo s_commandCtor =
+            typeof(Command).GetConstructor(
+                BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
+                binder: null,
+                new[] { typeof(CommandInfo) },
+                modifiers: null);
+
+        // PowerShell's missing an API for us to AddCommand using a CommandInfo.
+        // An issue was filed here: https://github.com/PowerShell/PowerShell/issues/12295
+        // This works around this by creating a `Command` and passing it into PSCommand.AddCommand(Command command)
+        internal static PSCommand AddCommand(this PSCommand command, CommandInfo commandInfo)
+        {
+            var rsCommand = (Command) s_commandCtor
+                .Invoke(new object[] { commandInfo });
+
+            return command.AddCommand(rsCommand);
+        }
+    }
+}