Elm:
בדיקה האם תיקייה קיימת

port module Main exposing (..)

-- Define a port to send directory check requests to JavaScript
port checkDirExists : String -> Cmd msg

-- A message type for directory check responses
type Msg
    = DirExistsResult Bool

-- Subscribe to the directory check responses from JavaScript
port dirExistsResponse : (Bool -> msg) -> Sub msg

-- Update function to handle the response
update : Msg -> Model -> (Model, Cmd msg)
update (DirExistsResult exists) model =
    ({ model | dirExists = exists }, Cmd.none)

// Assume the Elm app is initialized with the name 'app'

// Listen for a directory check request from Elm
app.ports.checkDirExists.subscribe(function(dir) {
    // Perform the actual check using Node.js or another server-side solution
    const exists = fs.existsSync(dir);
  
    // Send the result back to Elm
    app.ports.dirExistsResponse.send(exists);
});