Wasm in PowerShell

wasm.ps1

# iex (iwr 'https://gist.githubusercontent.com/anonhostpi/c82d294d7999d875c820e3b2094998e9/raw/wasm.ps1').Content

$engine = & {
    $package = "Wasmtime"

    $runtime = & (nmo {iex "using namespace System.Runtime.InteropServices" }) {

        $runtime = @{}
        $is = { param([OSPlatform] $platform); return ([RuntimeInformation]::IsOSPlatform($platform)) }

        $runtime.OS = switch ($true) {
            (& $is ([OSPlatform]::Windows)) { "win" }
            (& $is ([OSPlatform]::Linux))   { "linux" }
            (& $is ([OSPlatform]::OSX))     { "osx" }
        }
        $runtime.Arch = switch ([RuntimeInformation]::ProcessArchitecture) {
            "X64"   { "x64" }
            "Arm64" { "arm64" }
        }
        $runtime.Full = @($runtime.OS, $runtime.Arch) -join "-"

        return $runtime
    }

    $package = Get-Package -Name $package -ErrorAction Stop
    $directory = $package.Source | Split-Path

    $native = "$directory\runtimes\$($runtime.Full)\native\*wasmtime*" | Resolve-Path

    switch( $runtime.OS ) {
        "win"   { $env:PATH += ";$($native | Split-Path)" }
        "linux" { $env:LD_LIBRARY_PATH = "$($native | Split-Path):$env:LD_LIBRARY_PATH" }
        "osx"   { $env:DYLD_LIBRARY_PATH = "$($native | Split-Path):$env:DYLD_LIBRARY_PATH" }
    }

    Add-Type -Path "$directory\lib\netstandard2.1\Wasmtime.Dotnet.dll"

    return [Wasmtime.Engine]::new()
}

$module = '(module (func $hello (import "" "hello")) (func (export "run") (call $hello)))'
$module = [Wasmtime.Module]::FromText($engine, "hello", $module)

$linker = [Wasmtime.Linker]::new($engine)
$store = [Wasmtime.Store]::new($engine)

$hello = [System.Action]{
    Write-Host "Hello from Wasmtime!"
}
$hello = [Wasmtime.Function]::FromCallback($store, $hello)
$linker.Define("", "hello", $hello) | Out-Null

$instance = $linker.Instantiate($store, $module)
$run = $instance.GetAction("run")
$run.Invoke()