"Big Data" creator (creates big json files with an object array)

bigData.ps1

[CmdletBinding()]
param (
    [Parameter()]
    [String]
    $filePath,
    [long]
    $targetSizeInBytes = 500000000, #4294967296 Bit = 512MiB
    [switch]
    $deleteFile = $false
)

function addData {
    param (
        [string] $filePath,
        [long]$targetSizeInBytes,
        [int]$index,
        [string] $randomString
    )
    if (!(Test-Path $filePath)) {
        New-Item -ItemType File -Path $filePath
        Set-Content -Value "[" -Path $filePath
    }

    $file = Get-Item $filePath

    $fileSizeInBytes = $file.Length

    if ($fileSizeInBytes -ge $targetSizeInBytes) {
        Add-Content -Value ("`n]") -Path $filePath -NoNewline 
        return $false
    }
    
    if ($index -gt 0) {
        Add-Content -Value ",`n" -NoNewline -Path $filePath
    }
    
    $json = ConvertTo-Json (@{
        id = $index;
        targetSize = $targetSizeInBytes;
        currentSize = $fileSizeInBytes;
        path = $filePath;
        random = $randomString
    })

    Add-Content -Value ($json) -Path $filePath -NoNewline 
    return $true
}
if ($deleteFile -and (Test-Path $filePath)) {
    Remove-Item -Path $filePath
}

$randomString = (-join (0..5000 | ForEach-Object {((65..90) + (97..122) | Get-Random -Count 1 | ForEach-Object {[char]$_})}))

for ($i = 0; (addData -filePath $filePath -targetSizeInBytes $targetSizeInBytes -index $i -randomString $randomString); $i++) {
    Write-Host ("" + $i + " elements written to " + $filePath)
}

Write-Host ($filePath + " is now " + (Get-Item $filePath).Length + " Bytes long.")