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Hotreloading for Elm submodules doesn't work after compilation error #7557

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zkrzyzanowski opened this issue Jan 14, 2022 · 1 comment
Closed

Hotreloading for Elm submodules doesn't work after compilation error #7557

zkrzyzanowski opened this issue Jan 14, 2022 · 1 comment

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@zkrzyzanowski
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馃悰 bug report

Prior to upgrading to Parcel 2, any changes to .elm files would force a hot reload/compile. After upgrading to parcel 2.2.0, only changes to Main.elm will compile after a compile error has occurred. Any files imported by Main.elm will not reload after a compile error.

馃帥 Configuration (.babelrc, package.json, cli command)

index.html

<!DOCTYPE html>
<div id="root"></div>
<script type="module" src="index.ts"></script>

index.ts

import { Elm } from "./Main.elm";

Elm.Main.init({ node: document.getElementById("root") });

Main.elm

module Main exposing (..)

import Browser
import Html exposing (Html)
import SubModule

main =
  Browser.sandbox { init = init, update = update, view = view }

type alias Model = Int

init : Model
init =
  0

type Msg = NoOp

update : Msg -> Model -> Model
update msg model =
  case msg of
    NoOp ->
      model


view : Model -> Html Msg
view model =
  SubModule.view

Submodule.elm

module SubModule exposing (..)
import Html exposing (Html)

view : Html msg
view = 
    Html.div [] [Html.text "sub mod"]

package.json

{
  "name": "my-app",
  "devDependencies": {
    "@parcel/packager-raw-url": "^2.2.0",
    "@parcel/transformer-elm": "^2.2.0",
    "@parcel/transformer-webmanifest": "^2.2.0",
    "elm": "^0.19.1-5",
    "parcel": "^2.2.0",
    "posthtml-expressions": "^1.9.0",
    "typescript": "^4.5.4"
  }
}

Steps to reproduce

  • Force a compile error in Submodule.elm, i.e.
module SubModule exposing (..)
import Html exposing (Html)

view : Html msg
view =
  • Save
  • See compile error in browser
  • Fix compiler error
  • Save

馃 Expected Behavior

  • Elm recompiles and browser reloads page successfully

馃槸 Current Behavior

  • Elm doesn't recompile and the error message is still displayed even after it's been fixed

馃拋 Possible Solution

馃敠 Context

馃捇 Code Sample

https://github.com/zkrzyzanowski/parcel-elm-bug

馃實 Your Environment

Software Version(s)
Parcel 2.2.0
Node 16.3.0
npm/Yarn npm 8.1.0
Operating System MacOS 11.6
@mischnic
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Duplicate of #6124
Pending PR: #7547

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@mischnic @zkrzyzanowski