How do I get elm-make to find Native modules?

[Paul Chiusano]

I am trying to write a library that uses some native JS, but am getting an error 'could not find module Native.MyModuleName' when trying to compile using elm-make. I've cloned the directory structure and stub of the native code from Max New's lazy package (thanks Max!): https://github.com/maxsnew/lazy/blob/master/src/Native/Lazy.js

I'm guessing I'm just doing something silly. Any help would be greatly appreciated!

Here's what I'm doing:

    $ elm-make src/Messages.elm --output=messages.html

    Error when searching for modules imported by module 'Messages':

        Could not find module 'Native.Messages'

    Potential problems could be:

      * Misspelled the module name

      * Need to add a source directory or new dependency to elm-package.json

Hmm, ok. Here's my elm-package.json:

    {

        "version": "1.0.0",

        "summary": "w00t",

        "repository": "https://github.com/USER/PROJECT.git",

        "license": "MIT",

        "source-directories": [

            "src"

        ],

        "exposed-modules": ["Messages"],

        "dependencies": {

            "elm-lang/core" : "1.0.0 <= v < 2.0.0",

            "Dandandan/Easing" : "1.0.1 <= v < 2.0.0",  

            "maxsnew/lazy" : "1.0.0 <= v < 2.0.0"

        }

    }

And here's my directory structure:

    src/

      Native/

        Messages.js

      Messages.elm

And here's the relevant content from Messages.elm:

    module Messages where

    import Native.Messages

    -- some stuff

And Messages.js: 

    Elm.Native.Messages = {};

    Elm.Native.Messages.make = function(localRuntime) {

        localRuntime.Native = localRuntime.Native || {};

        localRuntime.Native.Messages = localRuntime.Native.Messages || {};

        if (localRuntime.Native.Messages.values) {

            return localRuntime.Native.Messages.values;

        }

        function blah(oog) {

          // some stuff

        }

        return localRuntime.Native.Messages.values = {

            blah: blah

        };

    };

Could anyone tell me what I'm doing wrong?

Paul :)

[Hassan Hayat]

1) You have to add : 

"native-modules" : true,

to your elm-package.json file or else it wont work.

Here's an example from one of my libraries

{
	"version": "1.0.0",
	"summary": "For-loops and While-loops in Elm",
	"repository": "https://github.com/TheSeamau5/elm-loop.git",
	"license": "BSD3",
	"source-directories": [
	"src"
	],
	"exposed-modules": [
	"Loop"
	],
	"native-modules" : true,
	"dependencies": {
	"elm-lang/core": "1.1.0 <= v < 2.0.0"
	}
	}

[Paul Chiusano]

Sweet! Thank you. I'm not sure how I missed that, but works now.

Paul :)

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