Unresolved reference during step with powershell.

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I

 have the next step on one of my pipelines on Teamcity

powerShell {
                    name = "Start e2e-container-group build at Azure"
                    executionMode = BuildStep.ExecutionMode.ALWAYS
                    scriptMode = script {
                        content = """
                            try {
                               $headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
                               $headers.Add("Authorization", "Basic token")
                               $headers.Add("Content-Type", "application/json")

                               $body = "{
                               `n  `"definitionId`": 7,
                               `n  `"description`": `"Release for E2E-UAT testing`"
                               `n}"

                               Invoke-RestMethod 'https://vsrm.dev.azure.com/company/projectname/_apis/release/releases?api-version=5.1' -Method 'POST' -Headers $headers -Body $body
                            } catch [Exception] {
                                Write-Output ${'$'}_.Exception.Message
                                exit 1
                            }
                        """.trimIndent()
                    }
                }

The output I get when running the pipeline is:

 Kotlin DSL compilation errors
Compilation error Extra\buildTypes\E2ETestsBuild.kt[89:33]: Unresolved reference: headers
Compilation error Extra\buildTypes\E2ETestsBuild.kt[90:33]: Unresolved reference: headers
Compilation error Extra\buildTypes\E2ETestsBuild.kt[91:33]: Unresolved reference: headers
Compilation error Extra\buildTypes\E2ETestsBuild.kt[93:33]: Unresolved reference: body
Compilation error Extra\buildTypes\E2ETestsBuild.kt[98:172]: Unresolved reference: headers
Compilation error Extra\buildTypes\E2ETestsBuild.kt[98:187]: Unresolved reference: body
StackTrace
Load project model
Read build settings from revision c8c0bd16eb07f4165ca37f310d0ee25a69a3d448

The script is working perfectly in powershell, is there any extra steps I have to do to run this on the pipeline?

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Fedor Rumyantsev
Created

In Kotlin, $something will be treated as a string template: https://kotlinlang.org/docs/reference/basic-types.html#string-templates
Therefore, PowerShell variables are treated as references to existing variables which are never defined in the script body.

There are two workarounds I would like to suggest:
1) you could store the script in file and set the step up to use file as a script source;
2) you could escape the $ character with ${'$'} - on compilation this will ensure end script is saved as intended. TeamCity already does it when versioned settings are saved from server to VCS:

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