Import for a bicepParam file is not working in the powershell module, but it is in the cli

[chambersDon]

I am using the import functionality in a bicep parameter file (bicepparam).

This works with the azure cli, but fails with the powershell module with the follow error:

Error BCP337: This declaration type is not valid for a Bicep Parameters file. Specify a "using" or "param" declaration.

I am using Bicep CLI version 0.28.1, and version 12.0.0 of the Az powershell module.

I enable user defined funcitons with this bicepconfig.json file:

  {
    "experimentalFeaturesEnabled": {
      "compileTimeImports": true,
      "userDefinedFunctions": true
    }
  }

I add an export function in a cfg.bicep file:

@export()
func testFunction(x string) string => x

I import this in a test.bicepparam file

using 'test.bicep'
import * as vars from 'cfg.bicep'

param theVal = vars.testFunction('A Test String')

And this is my bicep file (test.bicep):

param theVal string
output Value string = theVal

I use this azure cli command:

az deployment group create --name 'aaaaa' --resource-group MyResourceGroup --parameters $paramFile

This works, and I see the parameter named theVal has the correct string from the parameter file:

This fails when I use the powershell module with the same inputs. Here is the command:

New-AzResourceGroupDeployment -ResourceGroupName MyresourceGroup -Name 'aaaaa' -TemplateParameterFile $paramFile

I get the error at the beginning of this question: This declaration type is not valid for a Bicep Parameters file. Specify a "using" or "param" declaration.