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Turn Elm compiler output into modern ES Modules

Home Page: https://www.npmjs.com/package/elm-esm

JavaScript 100.00%

elm es6-modules

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elm-esm's Issues

elm-esm crashes

Something crashed unexpectedly. Please open an issue with this error message. https://github.com/ChristophP/elm-esm/issues/new

TypeError: Cannot read properties of null (reading 'toString')
    at findElmBinary (C:\Users\<user>\AppData\Roaming\npm\node_modules\elm-esm\src\run.js:15:12)
    at delegateToElmCompiler (C:\Users\<user>\AppData\Roaming\npm\node_modules\elm-esm\src\run.js:50:27)
    at run (C:\Users\<user>\AppData\Roaming\npm\node_modules\elm-esm\src\run.js:65:9)
    at Object.<anonymous> (C:\Users\<users>\AppData\Roaming\npm\node_modules\elm-esm\src\run.js:71:1)
    at Module._compile (node:internal/modules/cjs/loader:1159:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1213:10)
    at Module.load (node:internal/modules/cjs/loader:1037:32)
    at Module._load (node:internal/modules/cjs/loader:878:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:23:47

Modularize makeESModule

Thanks for sharing such a useful implementation ✨

One thing I'd like to request is that the distributed elm-esm npm provides importable makeESModule.

I'm imagining an interface like:

import { toESM } from 'elm-esm'

toESM(compiledElmProject)

I could build my own function by copying your code actually. However, I'm wondering if elm-esm becomes a single source of truth for this purpose in the community, and we can contribute when Elm core changes outcome in the future.

Program with non-trivial Flags type does not compile

Hello,

the following bug was created on my https://github.com/marc136/snowpack-plugin-elm/issues/3 by @andreasewering
And as I copied the code to turn the compiled elm code into an es module from your repository, I think the change should also be propagated into your tool.

I fixed it in my repo with this change.

Regards,
marc

Full description

When comipling the following file with npx elm-esm make src/DocumentWithFlags.elm --output=elm-esm-output.js, you can open the compiled js output and will notice that at the end the call to _Platform_export is not fully replaced.

module DocumentWithFlags exposing (main)

import Browser
import Html exposing (..)
import Json.Decode


type alias Flags =
    -- Json.Decode.Value -- this would work
    { test : String }


main : Program Flags Model Msg
main =
    Browser.document
        { init = init
        , view = view
        , update = update
        , subscriptions = subscriptions
        }


type alias Model =
    { property : String
    }


init : Flags -> ( Model, Cmd Msg )
init _ =
    ( Model "", Cmd.none )


type Msg
    = Msg1
    | Msg2


update : Msg -> Model -> ( Model, Cmd Msg )
update _ model =
    ( model, Cmd.none )


subscriptions : Model -> Sub Msg
subscriptions _ =
    Sub.none


view : Model -> Browser.Document Msg
view _ =
    { title = "Document Title"
    , body =
        [ h1 [] [ text "loaded" ] ]
    }

The output ends with the following lines:

var $author$project$DocumentWithFlags$main = $elm$browser$Browser$document(
	{init: $author$project$DocumentWithFlags$init, subscriptions: $author$project$DocumentWithFlags$subscriptions, update: $author$project$DocumentWithFlags$update, view: $author$project$DocumentWithFlags$view});
/*
_Platform_export({'DocumentWithFlags':{'init':$author$project$DocumentWithFlags$main(
	A2(
		$elm$json$Json$Decode$andThen,
		function (test) {
			return $elm$json$Json$Decode$succeed(
				{test: test});
*/
		},
		A2($elm$json$Json$Decode$field, 'test', $elm$json$Json$Decode$string)))(0)}});}(this));
export const Elm = {'DocumentWithFlags':{'init':$author$project$DocumentWithFlags$main(
	A2(
		$elm$json$Json$Decode$andThen,
		function (test) {
			return $elm$json$Json$Decode$succeed(
				{test: test};

But it should be:

var $author$project$DocumentWithFlags$main = $elm$browser$Browser$document(
	{au: $author$project$DocumentWithFlags$init, aB: $author$project$DocumentWithFlags$subscriptions, aD: $author$project$DocumentWithFlags$update, aE: $author$project$DocumentWithFlags$view});
/*
_Platform_export({'DocumentWithFlags':{'init':$author$project$DocumentWithFlags$main(
	A2(
		$elm$json$Json$Decode$andThen,
		function (test) {
			return $elm$json$Json$Decode$succeed(
				{ag: test});
		},
		A2($elm$json$Json$Decode$field, 'test', $elm$json$Json$Decode$string)))(0)}});}(this));
*/
export const Elm = {'DocumentWithFlags':{'init':$author$project$DocumentWithFlags$main(
	A2(
		$elm$json$Json$Decode$andThen,
		function (test) {
			return $elm$json$Json$Decode$succeed(
				{ag: test});
		},
		A2($elm$json$Json$Decode$field, 'test', $elm$json$Json$Decode$string)))(0)}});};

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