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    0.14.7 • Public • Published

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    Piral Elm · GitHub License npm version tested with jest Gitter Chat

    This is a plugin that only has a peer dependency to piral-core. What piral-elm brings to the table is a set of Pilet API extensions that can be used with piral or piral-core.

    The set includes an Elm converter for any component registration, as well as a fromElm shortcut together with a elm-extension web component.

    By default, these API extensions are not integrated in piral, so you'd need to add them to your Piral instance.


    The following functions are brought to the Pilet API.


    Transforms a standard Elm component into a component that can be used in Piral, essentially wrapping it with a reference to the corresponding converter.


    ::: summary: For pilet authors

    You can use the fromElm function from the Pilet API to convert your Elm components to components usable by your Piral instance.

    Example use:

    import { PiletApi } from '<name-of-piral-instance>';
    import Elm from './Page.elm';
    export function setup(piral: PiletApi) {
      piral.registerPage('/sample', piral.fromElm(Elm.Page));

    Within Elm components the Piral Elm extension component can be used by referring to elm-extension, e.g.,

    <elm-extension name="name-of-extension"></elm-extension>

    Alternatively, if piral-elm has not been added to the Piral instance you can install and use the package also from a pilet directly.

    import { PiletApi } from '<name-of-piral-instance>';
    import { fromElm } from 'piral-elm/convert';
    import Elm from './Page.elm';
    export function setup(piral: PiletApi) {
      piral.registerPage('/sample', fromElm(Elm.Page));


    ::: summary: For Piral instance developers

    Using Elm with Piral is as simple as installing piral-elm.

    import { createElmApi } from 'piral-elm';

    The integration looks like:

    const instance = createInstance({
      // important part
      plugins: [createElmApi()],
      // ...


    Pilet Usage

    The essential registration can be simplified like (e.g., for a tile):

    import { PiletApi } from 'sample-piral';
    import { Elm } from './Tile.elm';
    export function setup(app: PiletApi) {
      app.registerTile(app.fromElm(Elm.Tile), {
        initialColumns: 2,
        initialRows: 2

    For the associated Elm code the following (standard) form applies:

    module Tile exposing (main)
    import Browser
    import Html exposing (div, h1, text, Html)
    import Html.Attributes exposing (attribute)
    type Msg = Increment | Decrement
    type alias Props =
      { columns : Int
      , rows : Int
    view model =
        div[] [
            h1 [] [ text "Hello, Elm! ", text (String.fromInt model.columns), text " x ", text (String.fromInt model.rows) ],
            Html.node "elm-extension" [ attribute "name" "smiley" ] []
    main : Program Props Props Msg
    main =
            { init = init
            , view = view
            , update = \msg model -> ( model, Cmd.none )
            , subscriptions = always Sub.none
    init : Props -> (Props, Cmd Msg)
    init flag =
        (flag, Cmd.none)

    Either way an elm.json will be created in the pilet root folder. It will look similar to the following file:

        "type": "application",
        "source-directories": [
        "elm-version": "0.19.1",
        "dependencies": {
            "direct": {
                "elm/browser": "1.0.2",
                "elm/core": "1.0.4",
                "elm/html": "1.0.0"
            "indirect": {
                "elm/json": "1.1.3",
                "elm/time": "1.0.0",
                "elm/url": "1.0.0",
                "elm/virtual-dom": "1.0.2"
        "test-dependencies": {
            "direct": {},
            "indirect": {}


    Piral is released using the MIT license. For more information see the license file.


    npm i piral-elm



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    • florianrappl