Elm Native Module Not Found

# Command to test the single compilation.
# Actually, it is set up to compile with webpack and elm-webpack-loader.
$ elm-make app/frontend/elm/Mermaid.elm
I cannot find find module 'Native. Mermaid'.

Module 'Mermaid' is trying to import it.

Potential problems could be:
  * Misspelled the module name
  * Need to add a source directory or new dependency to elm-package.json

$findapp/frontend/elm/-iname "Mermaid.*"
app/frontend/elm//Mermaid.elm
app/frontend/elm//Native/Mermaid.js

module Mermaid where
{-| ...
-}

import Html exporting (Html)
import Native.Mermaid

...

//setup
Elm.Native=Elm.Native||{};
Elm.Native.Mermaid=Elm.Native.Mermaid||{};

// definition
Elm.Native.Mermaid.make=function(localRuntime){
  'use strict';

  if('values' in Elm.Native.Mermaid){
    return Elm.Native.Mermaid.values;
  }

  ...

  return Elm.Native.Mermaid.values={
    toHtmlWith—F2(toHtmlWith)
  };
};