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https://github.com/wking-io/elm-live

⚡ A flexible dev server for Elm. Live reload included.
https://github.com/wking-io/elm-live

developer-tools elm livereload

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⚡ A flexible dev server for Elm. Live reload included.

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elm-live



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# elm-live | A flexible dev server for Elm. Live reload included.



**New Version Available**



Thanks to the help of @lucamug and others a new version of elm-live is available! With the following changes:



* Hot reloading

* Local SSL

* No reload mode

* No server mode

* Removed before and after build commands. If you used these and cannot imagine using elm-live without them make an issue and let's discuss!

* and more!



Screencast



## INSTALLATION



To use the new version of elm-live while it is in alpha you can run one of the following commands:



```sh

# Globally for a user:

npm install --global elm elm-live@next



# …or locally for a project:

npm install --save-dev elm elm-live@next

```



Otherwise, to use the latest stable version:



```sh

# Globally for a user:

npm install --global elm elm-live



# …or locally for a project:

npm install --save-dev elm elm-live

```



### If you are using Elm 0.18



```sh

# Globally for a user:

npm install --global elm elm-live@prev



# …or locally for a project:

npm install --save-dev elm elm-live@prev

```



If you’d rather bring your own global `elm`, `npm install --global elm-live` will do.



## Version Compatibility



| Node Version   | elm-live Tag Version  |

| -------------- | --------------------- |

| 4              | <= v2.6.1             |

| 6              | >= v2.6.2 && < v4.0.0 |

| 10             | >= v4.0.0             |



## SYNOPSIS



```sh

elm-live [...] [--] ...  

elm-live --help

```



## DESCRIPTION



First, we spawn `elm make` with the `elm make args` you’ve given.



When the build is ready, we start a static HTTP server in the current directory. We inject a _live reload_ snippet into every HTML file we serve. Every time a static file has changed, we’ll reload your app in all browsers you’ve opened it with. (Mobile and IE included!)



We also watch all `*.elm` files in the current directory and its subdirectories. Whenever you change, add or remove one of them, we’ll rebuild your program and reload the page.



## OPTIONS



#### `-e, --path-to-elm=PATH`

An absolute or relative path to `elm`. If you’ve installed _elm-platform_ locally with _npm_ (`npm install --save-dev elm`), you’ll likely want to set this to `node_modules/.bin/elm`. Default: `elm`.



#### `-p, --port=PORT`

Set the port to start the server at. If the port is taken, we’ll use the next available one. `PORT` should be a valid port number. Default: `8000`.



#### `-h, --host=HOST`

Set the host interface to attach the server to. Default: `localhost`.



#### `-S, --ssl`

Start an https server instead of http. Default: `false`.



#### `-S, --ssl-cert=PATH`

Pass in a relative path to your own ssl cert. Default: `false`.



#### `-S, --ssl-key=PATH`

Pass in a relative path to your own ssl key. Default: `false`.



#### `-x, --proxy-prefix=PREFIX`

Proxy requests to paths starting with `PREFIX` to another server. Requires `--proxy-host` and should be a string like `/api`. Defaults to not proxying



#### `-y, --proxy-host=HOST`

Proxy requests to another server running at `HOST`. Requires `--proxy-prefix` and should be a full URL, eg. `http://localhost:9000`. Defaults to not proxying



#### `-d, --dir=PATH`

The base for static content. Default: `.`.



#### `-s, --start-page=PATH`

A custom html file to serve other than the default `index.html`.



#### `-u, --pushstate`

Serve `index.html` on 404 errors. This lets us use client-side routing in Elm. For instance, we can have a URL like `http://localhost:8000/account` get handled by the Elm _navigation_ package instead of failing with a 404 error.



#### `-H, --hot`

Turn on hot module reloading.



#### `-o, --open`

We’ll open the app in your default browser as soon as the server is up.



#### `-v, --verbose`

Log more stuff!



#### `--no-reload`

Turn off live reload. This means you will need to manual reload your website after each build to see the changes.



#### `--no-server`

Turn off the server for `elm-live`. This is useful when you are using elm inside of another development ecosystem.



#### `--help`

You’re looking at it.



 



## EXAMPLES



### Have the compiler generate your index.html for you.



This command will start the server at https://localhost:8000 and compile your elm code to an index.html file in the folder you are running the command from. Note: the `--open` flag will open the page in the browser for you. 



```sh

$ elm-live src/Main.elm --open

```



### Use a custom HTML file



This command tells `elm make` to compile your elm code to a file named `main.js` in the folder you are running the command from. From there you just need to include the script in default file of index.html as shown in the Elm guide here: https://guide.elm-lang.org/interop/



```sh

$ elm-live src/Main.elm --open -- --output=main.js

```



To specify an HTML file other than the default, you can use the `--start-page` flag. This is an easy way to avoid `elm make` accidentally overriding your custom HTML.



```sh

$ elm-live src/Main.elm --open --start-page=custom.html -- --output=main.js

```



### Support client-side routing in Elm



This command tells the server to always serve up the index.html no matter what the URL is. This allows Elm to handle the routing clientside. Note: this option is a must when you are using `Browser.Navigation`



```sh

$ elm-live src/Main.elm --open --pushstate

```



### Adding the debugger during dev



All possible `elm make` flags are available in `elm-live`. You just need to make sure they are passed after `--` in the command. So the command below shows how to turn on the debugger in `elm make`.



```sh

elm-live src/Main.elm --open -- --debug

```



## TROUBLESHOOTING



#### I’m seeing a SyntaxError about block-scoped declarations



If you’re seeing one of these:



```

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

```



make sure you’re running on node 6+. If you can’t upgrade, consider [transpiling](https://github.com/wking-io/elm-live/issues/2#issuecomment-156698732) `source/elm-live.js` to ES5.



By the way, [yarn](https://github.com/yarnpkg/yarn) should be warning you about installing incompatible packages. To get the same behavior in npm, [set the `engine-strict`](https://docs.npmjs.com/misc/config#engine-strict) flag.



## Original Author

Huge shoutout to the creator [Tomek Wiszniewski](https://github.com/tomekwi)!



## Current Owner

[Will King](https://github.com/wking-io)



## CREDITS



Many thanks to [Evan Czaplicki](https://github.com/evancz), the creator of Elm, for the [Elm Compiler](https://github.com/elm/compiler) – the most brilliant language compiler the world has ever seen! Without _elm make_, _elm-live_ would be a car without an engine.



Many thanks to [Matt DesLauriers](https://github.com/mattdesl) for the wonderful [budo](https://github.com/mattdesl/budo). That’s what does the heavy lifting on the static server side.



Warm thanks to our amazing contributors! Credits to [Brian](https://github.com/bdukes) for making Windows support possible, [Kurt](https://github.com/kbsymanz) for allowing a configurable `--host` and [Josh](https://github.com/joshmh) for his work on enabling client-side navigation. Thanks to [Ryan](https://github.com/Ryan1729) batch updates are nice and fast. Kudos to [Mathieu](https://github.com/magopian), [Rémy](https://github.com/natim) and [Nicolas](https://github.com/n1k0) for making the developer experience smoother and to [Gabriel](https://github.com/peacememories) for the `--before-build` option. Many thanks to [Noah](https://github.com/eeue56) for making sure elm-live works smoothly with [elm-test](https://github.com/elm-community/elm-test). Thanks to [Darren](https://github.com/darrensiegel) for finding and fixing the bug with `--port` options on the 3.0.0 release.



## LICENSE



[MIT](https://git.io/elm-live.License) © [Will King](https://github.com/wking-io) & [Tomek Wiszniewski](https://github.com/tomekwi)