Awesome Open Source
Awesome Open Source

Elm 0.19.1 with Webpack 4, Hot Reloading & Babel 7


Elm dev environment with hot-loading (i.e. state is retained as you edit your code - Hot Module Reloading, HMR)). I use this daily for my professional work. Like elm-community/elm-webpack-starter but using Webpack 4.


Clone this repo into a new project folder and run install script. (You will probably want to delete the .git/ directory and start version control afresh.)

With npm

$ git clone [email protected]:simonh1000/elm-webpack-starter.git new-project
$ cd new-project
$ npm install


Start with Elm debug tool with either

$ npm start
$ npm start --nodebug

the --nodebug removes the Elm debug tool. This can become valuable when your model becomes very large.

Open http://localhost:3000 and start modifying the code in /src. Note that this starter expects you have installed elm-format globally.

An example using Routing is provided in the navigation branch


Build production assets (js and css together) with:

npm run prod

Static assets

Just add to src/assets/ and the production build copies them to /dist


Install elm-test globally

elm-test init is run when you install your dependencies. After that all you need to do to run the tests is

npm test

Take a look at the examples in tests/

If you add dependencies to your main app, then run elm-test --add-dependencies


Elm-analyse is a "tool that allows you to analyse your Elm code, identify deficiencies and apply best practices." Its built into this starter, just run the following to see how your code is getting on:

$ npm run analyse

Circle CI

$ circleci local execute --job build


This starter includes Babel so you can directly use ES6 code.


  • 3.10.4 - Use better webpack defaults in dev mode
  • 3.10.0 - Css minify
  • 3.9.3 - Update deps
  • 3.9.2 - Update elm/core and other deps
  • 3.9.1 - Version 0.19.1
  • 3.9.0 - Switch the closure compiler for minification in prod
  • 3.8.0 - Update deps
  • 3.7.0 - Add elm-analyse
  • 3.6.0 - Add CI script
  • 3.5.0 - Simpler means to work with/out the debug window
  • 3.4.0 - Add ability to start dev mode without debug window
  • 3.3.0 - Switch to elm/http 2.0.0 (and other deps updates)
  • 3.2.0 - Add elm-minify to prod builds (thanks Asger)
  • 3.1.0 - Revert to webpack-dev-server with example
  • 3.0.2 - bugfixes (mostly for tests)
  • 3.0.1 - use publicPath to ensure compatibility with more complex routes
  • 3.0.0 - Version 0.19
  • 2.1.0 - switch to webpack-serve (from webpack dev server)
  • 2.0.0
    • Remove Bootstrap (use purecss as simple alternative - you don't want me choosing your css framework after all)
    • Compile CSS into separate file
  • 1.2.0 - Webpack 4, Babel 7
  • 1.1.0 - add elm-verify-examples

How it works

npm run dev maps to webpack-dev-server --hot --colors --port 3000 where

  • --hot Enable webpack's Hot Module Replacement feature
  • --port 3000 - use port 3000 instead of default 8000
  • inline (default) a script will be inserted in your bundle to take care of reloading, and build messages will appear in the browser console.
  • --colors should show the colours created in the original Elm errors, but does not (To Fix)

One alternative is to run npx webpack-dev-server --hot --colors --host= --port 3000 which will enable your dev server to be reached from other computers on your local network


A long time ago this code was forked from

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