Extension should notify user when Constrained or Restricted language mode is enabled

[ghost]

Please fill in these details so that we can help you!

System Details

• Operating system name and version: Windows 10 Enterprise 64-bit (1607)
• VS Code version: 1.5.1
• PowerShell extension version: 0.7.2
• Output from $PSVersionTable:

Name                           Value                                                                                   
----                           -----                                                                                   
PSVersion                      5.1.14393.103                                                                           
PSEdition                      Desktop                                                                                 
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                 
BuildVersion                   10.0.14393.103                                                                          
CLRVersion                     4.0.30319.42000                                                                         
WSManStackVersion              3.0                                                                                     
PSRemotingProtocolVersion      2.3                                                                                     
SerializationVersion           1.1.0.1                                                                                 

Issue Description

Everytime when I open any PS script with VS Code and PS extension installed I get these errors:

Error: Could not start language service: undefined
Error: Couldn't start client PowerShell Editor Services

1473484659-PowerShell.zip

Attached Logs

Follow the instructions in the README
about capturing and sending logs.

[daviwil]

Hi @z442a9, it appears that your machine must have some policy set which enabled ConstrainedLanguage mode. This is preventing the language service from loading successfully.

Open a normal PowerShell prompt and run this line and let me know if the output is ConstrainedLanguage or RestrictedLanguage:

$ExecutionContext.SessionState.LanguageMode

You may have to talk to your administrator to see if this can be turned off for the PowerShell extension to work correctly. I'll add a warning message in the UI to notify the user that the extension won't work when this mode is turned on.

[ghost]

Hi

When I run the command the output is: ConstrainedLanguage

[caparkaya]

Hello,
I see that this issue is still open but notification is already here for a long time for me in VS Code. Isn't it time to move to next step, i.e. removing the need for the message by supporting constrained mode like Powershell ISE does?

[rjmholt]

Because we're not a native app (like the ISE), but instead a client/server, with the server being a PowerShell process running a module that hosts PowerShell execution, I suspect trying to implement this we'd have widespread problems with things like the whitelisted types (i.e. EditorServices is just an ordinary PowerShell module which uses non-whitelisted types for everything from just starting the host to creating the message transport channel, so getting it to start in ConstrainedLanguage mode would be a significant work item).

I'll see if I can do some investigating on the feasibility of this.

[TylerLeonhardt]

Closing this in favor of #754