feat($compile): Added option to enable Elm Debugger for production build

Added option to enable Elm Debugger for production build (`elm-app build`), by setting
`ELM_DEBUGGER="true"`, this is disabled by default. Also updated the documentation.

187

Author: tzemanovic

config/webpack.config.prod.js

@@ -112,6 +112,9 @@ module.exports = {
             // Use the local installation of elm-make
             loader: require.resolve('elm-webpack-loader'),
             options: {
+              // If ELM_DEBUGGER was set to "true", enable it. Otherwise
+              // for invalid values, "false" and as a default, enable it
+              debug: process.env.ELM_DEBUGGER === 'true' ? true : false,
               pathToMake: paths.elmMake
             }
           }

template/README.md

@@ -19,7 +19,7 @@ You can find the most recent version of this guide [here](https://github.com/hal
     - [repl](#repl)
     - [make](#make)
     - [reactor](#reactor)
-- [Turning off Elm Debugger](#turning-off-elm-debugger)
+- [Turning on/off Elm Debugger](#turning-on-off-elm-debugger)
 - [Changing the Page `<title>`](#changing-the-page-title)
 - [Adding a Stylesheet](#adding-a-stylesheet)
 - [Post-Processing CSS](#post-processing-css)
@@ -162,9 +162,11 @@ Alias for  [elm-make](http://guide.elm-lang.org/get_started.html#elm-make)
 Alias for  [elm-reactor](http://guide.elm-lang.org/get_started.html#elm-reactor)
 
 
-## Turning off Elm Debugger
+## Turning on/off Elm Debugger
 
-To turn off Elm Debugger, set `ELM_DEBUGGER` environment variable to `false`
+By default, in production (`elm-app build`) the Debugger is turned off and in development mode (`elm-app start`) it's turned on.
+
+To turn on/off Elm Debugger explicitly, set `ELM_DEBUGGER` environment variable to `true` or `false` respectively.
 
 ## Changing the base path of the assets in the HTML