elm-hot-loader: add hot swapping support to elm-webpack-loader

[Flux Xu]

I made a webpack loader to use with @rtfeldman 's elm-webpack-loader.

It can hot swap module (instead of reloading page) when you save.

Repo & example are here: https://github.com/fluxxu/elm-hot-loader

Hope you will find it useful.

Thanks.

[Thomas Coopman]

Nice work!

Looks very useful, going to try this out!

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[Robin Heggelund Hansen]

This is fantastic work Flux Xu! :D

[Maxwell Gurewitz]

Awesome!  Check out elm-server, a package I wrote for this same purpose https://www.npmjs.com/package/elm-server

It also supports asset live reloading without page refreshes, but it's available as a standalone cli tool (without webpack).

[Justin Firth]

This is great, nice work to both you and @rtfeldman!  A lot of great tooling can spring up quickly around this type of solution.  Lack of additional tooling aside, an elm-webpack-loader + elm-hot-loader combo is already a better solution for my generator than the elm reactor in it's current form.  It will greatly simplify the build and watch pipeline, as I am already dependent on webpack for native module packing and style pre- and post-processing.  I hope to bring this in over the weekend.

[Simon]

Does it hotload even in the context of ports / effects? This was the big weakness of the elm-reactor solution?

[Flux Xu]

Yes. It memorizes calls to elm.ports.<portName>.subscibe/unsubscribe and will replay them after hot swap.

[Flux Xu]

Thanks, I hope it will be useful for you! :D

[Flux Xu]

Nice work! But we have to stick with webpack for now because we rely on webpack to handle JSX/LESS/Image files.