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elm-assets-loader

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webpack loader for webpackifying asset references in Elm code

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# DEPRECATED
This package is no longer used internally at NoRedInk. We suggested that community members fork it and take it in the direction that makes sense to them. Maybe that means adding more features. Maybe it means removing things to make it even simpler. Maybe it means rewriting it from scratch. Point is, please search for packages with the same or similar name, and look for an author you trust.

# Elm assets loader [![Version](https://img.shields.io/npm/v/elm-assets-loader.svg)](https://www.npmjs.com/package/elm-webpack-loader) [![Travis build Status](https://travis-ci.org/NoRedInk/elm-assets-loader.svg?branch=master)](http://travis-ci.org/NoRedInk/elm-assets-loader)

[webpack](http://webpack.github.io/docs/) loader for webpackifying asset references
in [Elm](http://elm-lang.org/).

## Installation

```sh
$ npm install --save elm-assets-loader
```

## Usage

[Documentation: Using loaders](http://webpack.github.io/docs/using-loaders.html)

elm-assets-loader is intended to be chained after [elm-webpack-loader](https://github.com/rtfeldman/elm-webpack-loader),
and with a loader to load static assets like [file-loader](https://github.com/webpack/file-loader)
or [url-loader](https://github.com/webpack/url-loader). [elm-asset-path](https://github.com/NoRedInk/elm-asset-path)
is a companion Elm package that provides types and functions for working with asset paths.

Suppose we have a union type for tagging asset paths:

```elm
module My.Assets exposing (AssetPath(..))

type AssetPath
    = AssetPath String

star =
    AssetPath "star.png"
```

Tell elm-assets-loader to look for strings tagged with `AssetPath`:

```js
    rules: [
      {
        test: /\.elm$/,
        exclude: [/elm-stuff/, /node_modules/],
        use: [
          {
            loader: 'elm-assets-loader',
            options: {
              module: 'My.Assets',
              tagger: 'AssetPath'
            }
          },
          'elm-webpack-loader'
        ]
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        loader: 'file-loader',
        options: {
          name: '[name]-[hash].[ext]'
        }
      }
    ]
```

Then at runtime, the value of `My.Assets.star` will be something like
`AssetPath "star-038a1253d7a9e4682deb72cd68c3a328.png"`.

To actually use this string value, define a helper like so:

```elm
-- say, in My.Assets

path : AssetPath -> String
path (AssetPath str) =
    str
```

Usage example:

```elm
viewStar : Html Msg
viewStar =
    img [ src <| My.Assets.path <| My.Assets.star ] []
```

[elm-asset-path](https://github.com/NoRedInk/elm-asset-path) includes a reference
implementation of this `AssetPath` type with support for resolving to a URL on a CDN.

## Options

### tagger (required)

- Example: `"AssetPath"`
- The "tag" part of a tagged union of shape `<tagger> String` that's used to tag asset paths in your code.

### module (required)

- Example: `"My.Assets"`
- Module in which the tagged union is defined.

### package (optional)

- Default: `"user/project"`
- Example: `"NoRedInk/myapp"`
- Look for the tagger inside this package.
- If the module you specified above is provided by a 3rd party package, then specify the
  name of that package.
- If the module you specified above is defined in your main application code, then specify the owner/repo
  portion of the "repository" property of your `elm-package.json`.
  - ex.`"repository": "https://github.com/user/project.git"` -> package should be `"user/project"`
  - ex.`"repository": "https://github.com/NoRedInk/myapp.git"` -> package should be `"NoRedInk/myapp"`

### dynamicRequires (optional)

- Default: `"warn"`
- Possible values: `"error"` | `"warn"` | `"ok"`
- What to do with dynamically constructed asset paths.
  - "error" - stop processing the file
  - "warn" - emit a warning
  - "ok" - this is expected; say nothing about it

[Dynamic requires][dynamic-requires] is *not* supported. This option simply
  controls whether or not to raise an error or skip over expressions like:

```elm
  example iconName =
      AssetPath ("icon-" ++ iconName ++ ".png")
  ```

[dynamic-requires]: https://webpack.github.io/docs/context.html#dynamic-requires

### localPath (optional)

- Function to transform tagged strings to a path that can be resolved by webpack.
  For example, you may want to tag URL paths, which may not be resolvable to a
  filesystem path, so that your code works without being webpacked.

```elm
  star = AssetPath "/public/images/star.png"

img [ src (toUrl star) ] []
  ```

webpack config (for webpack 2):

```js
  module.exports = {
    ...
    module: {
      rules: [
        {
          test: /\.elm$/,
          use: [
            {
              loader: 'elm-assets-loader',
              options: {
                localPath: function(url) {
                  // transform `url` to a local path that resolves to a file
                  return url.replace(/^\/public\//, "");
                }
              }
            },
            'elm-webpack-loader?cwd=' + fixturesPath + '&pathToMake=' + elmMakePath
          ]
        },
        {
          test: /\.svg$/,
          use: {
            loader: 'file-loader',
            options: {
              publicPath: function(path) {
                // transform `path` to a URL that the web server can understand and serve
                return "/public/" + url;
              }
            }
          }
        }
      }
    }
  }
  ```

### Note

Don't set noParse on .elm files. Otherwise, `require`s won't be processed.

## Under the hood

Let's walk through what happens to the example above when processed by webpack.

This Elm code:

```elm
AssetPath "star.png"
```

will be compiled to JavaScript by elm-webpack-loader:

```js
author$project$My_Assets$AssetPath("star.png")
```

elm-assets-loader turns this into:

```js
author$project$My_Assets$AssetPath(require("star.png"))
```

webpack parses this `require` call, determines it to be a file-loader module, resulting in:

```js
author$project$My_Assets$AssetPath(__webpack_require__(30))
```

The module loaded by `__webpack_require__(30)` will look like:

```js
30:
function(module, exports) {
   module.exports = "star-038a1253d7a9e4682deb72cd68c3a328.png";
}
```

Which means, effectively, the JavaScript code we saw originally has been rewritten as:

```js
author$project$My_Assets$AssetPath("star-038a1253d7a9e4682deb72cd68c3a328.png")
```

### Supported Versions
See .travis.yml to see supported combinations of the Elm Compiler & Webpack.

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