as noted by @achambers in #14

Maybe what the real change needed here is a better way to define custom selectors....At the moment you either use the defaults or override the jsonBlueprint property, which means you'd need to duplicate the current default selectors and add your new ones in.
Maybe we can look at a way to say, I want the default selectors and also these other custom selectors.

I recently implemented this addon and noticed that the index.json output does not respect the outputPaths config setting in ember-cli-build.js. Here is a sample of my configuration and the resulting index.json output from ember deploy production:

// ember-cli-build.js
const isProduction = ( process.env.EMBER_ENV || 'development' ) === 'production';
const assetPath = isProduction ? '' : '/assets';

module.exports = function(defaults) {
  var app = new EmberApp(defaults, {
    outputPaths: {
      app: {
        html: 'index.html',
        css: {
          'app': assetPath + '/app.css'
        },
        js: assetPath + '/app.js'
      },
      vendor: {
        css: assetPath + '/vendor.css',
        js: assetPath + '/vendor.js'
      }
    }
  });
}

// config/deploy.js
var ENV = {
  build: {},
  'json-config': {
    jsonBlueprint(context, pluginHelper) {
      var jsonBlueprint = pluginHelper.readConfigDefault('jsonBlueprint');
      jsonBlueprint.script.includeContent = true;
      return jsonBlueprint;
    }
  }
};

// index.json
{
  "base": [],
  "meta": [],
  "link": [{
    "rel": "stylesheet",
    "href": "assets/vendor-13455b8fd285c046141dd54ae73890f8.css"
  }, {
    "rel": "stylesheet",
    "href": "assets/app-efe517a8fe179e4392e64c2a9ce8fe05.css"
  }],
  "script": [{
    "src": "assets/vendor-127d2a9b59896b5ddff4de18193179cb.js"
  }, {
    "src": "assets/app-774827c1c48acfbdb034cbc16d3f5fb7.js"
  }]
}

This is in the README.

The generated index.html in build has a

<meta name="my-app/config/asset-manifest" content="%7B%22bundles%22%3A%7B%7D%7D" />

tag that is not transferred to the index.json file.

Currently, we're pulling the index.html path from the context.indexPath property provided by ember-cli-deploy-build. It would be nice to be able to specify this in the config as well, if wanted....

Config should override the context value

Love the plugin and the rest of ember-cli-deploy - thank you.

I just ran into an issue where my index.json file was gzipped along with other resources which obviously caused problems.

I don't believe this to be a bug but maybe worth adding to the docs / readme that if using in conjunction with ember-cli-deploy-gzip that you should add the following to your deploy.js file:

gzip: {
  ignorePattern: 'index.json'
}