Fixing "Warning: Interpolation-only expressions are deprecated" with Powershell

readme.md

In terraform .12 they changed how expressions are allowed to be interpolated and removed the need for quotes. So "${var.variable}" can now be var.variable.

Here is a powershell script that will loop through your Terraform code and update those expressions.

replace-interpolation-only-expresions.ps1

forEach($file in gci -Recurse -Filter *.tf -file){
    Write-host "updating " $file.Fullname -ForegroundColor Magenta
    ((Get-Content -path $file.Fullname ) -replace '^(.*)\"\${(.*)}"','$1$2') | Set-Content -Path $file.Fullname
}