Generate VS Code launch.json file that debugs jest

jestdbg.ps1

param([string]$relativePath = "")

if ($relativePath -eq $null) { 
    Write-Error "Specify a file to debug."
    exit 1
}

$file = Resolve-Path -Path $relativePath

$matches = $file | Select-String -Pattern "(?<root>.*\/)(apps|libs)\/(?<prj>.*?)\/src/.*"
if ($matches.Count -eq 0) { 
    Write-Error "Specified path did not match the expected pattern."
    exit 1 
}

$root = $matches.Matches[0].Groups["root"].Value
$prj = $matches.Matches[0].Groups["prj"].Value

$launchCode = @{
    configurations = @(
        @{
            name = "debug-jest-lib"
            type = "node"
            request = "launch"
            program = "`${workspaceFolder}/node_modules/@angular/cli/bin/ng"
            args = @(
                "test", 
                $prj,
                "--codeCoverage=false",
                "--testNamePattern=.*",
                "--testFile=`${file}"
            )
            cwd = "`${workspaceFolder}"
            console = "internalConsole"
        }
    )
} | ConvertTo-Json -Depth 3

$outpath = "$root/.vscode/launch.json"
[IO.File]::WriteAllText($outpath, $launchCode, [System.Text.Encoding]::UTF8)

Write-Host "Updated: $outpath"
Write-Host $launchCode