<a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="31

<a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/us

For other contributors, here's the compiling gren code: <div class="highlight high

<a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/us

`Process.kill` repeatedly → js error about core HOT 3 CLOSED

lue-bird commented on August 10, 2024

`Process.kill` repeatedly → js error

from core.

Comments (3)

robinheghan commented on August 10, 2024 1

@alexislozano Gren doesn't have tuples. Use Unit instead of the empty tuple, and { model = ..., command ... } for the init and update return values.

from core.

alexislozano commented on August 10, 2024 1

For other contributors, here's the compiling gren code:

module Main exposing (..)

import Html exposing (text)
import Process
import Task exposing (Task)
import Browser


killProcessTwice : Task Never Unit
killProcessTwice =
    Task.succeed Unit
        |> Process.spawn
        |> Task.andThen
            (\pid ->
                Process.kill pid
                    |> Task.andThen (\_ -> Process.kill pid)
            )


main =
    Browser.element
        { init = \Unit ->
            { model = Unit
            , command = Task.perform (always Unit) killProcessTwice
            }
        , view = \_ -> text "oops"
        , update = \_ model -> { model = model, command = Cmd.none }
        , subscriptions = \_ -> Sub.none
        }

from core.

alexislozano commented on August 10, 2024

@lue-bird When I try to compile with gren the example given in the linked issue:

module Main exposing (..)

import Html exposing (text)
import Process
import Task exposing (Task)
import Browser


killProcessTwice : Task Never ()
killProcessTwice =
    Task.succeed ()
        |> Process.spawn
        |> Task.andThen
            (\pid ->
                Process.kill pid
                    |> Task.andThen (\_ -> Process.kill pid)
            )


main =
    Browser.element
        { init = \() ->
            ( ()
            , Task.perform (always ()) killProcessTwice
            )
        , view = \_ -> text "oops"
        , update = \_ model -> (model, Cmd.none)
        , subscriptions = \_ -> Sub.none
        }

I get an error about empty tuples:

$ gren make src/Main.gren 
Detected problems in 1 module.
-- PROBLEM IN TYPE ANNOTATION ------------------------------------ src/Main.gren

I was partway through parsing the `killProcessTwice` type annotation, but I got
stuck here:

9| killProcessTwice : Task Never ()
                                  ^
I was expecting to see a type next. Try putting Int or String for now?

Do you know what could be happening?

from core.

Recommend Projects