Ember CLI performance improvements and tips

ember-cli-build.js

// Credits to the following posts that helps me to reduce build times drastically

// https://discuss.emberjs.com/t/tips-for-improving-build-time-of-large-apps/15008/12
// https://www.gokatz.me/blog/how-we-cut-down-our-ember-build-time/


//ember-cli-build.js
let EmberApp = require('ember-cli/lib/broccoli/ember-app');

let env = EmberApp.env(),
  IS_PROD = env === 'production',
  IS_TEST = env === 'test' ;

module.exports = function(defaults) {
  let app = new EmberApp(defaults, {
    hinting: IS_TEST, // Disable linting for all builds but test
    tests: IS_TEST, // Don't even generate test files unless a test build
    "ember-cli-babel": {
      includePolyfill: IS_PROD // Only include babel polyfill in prod
    },
    autoprefixer: {
      sourcemap: false // Was never helpful
    },
    sourcemaps: {
      enabled: IS_PROD // CMD ALT F in chrome is *almost* as fast as CMD P
    },
    fingerprint: {
      enabled: IS_PROD //Asset rewrite will takes more time and fingerprinting can be omitted in development
    },
    sassOptions: {
    // moving from compass compiler to node gave huge improvement
      implementation: nodeSass, //implementation here is node-sass,
      sourceMap : false //will debug with generated CSS than sourcemap :) 
    },

// Only import other polyfills in production
    if (IS_PROD) {
      app.import('vendor/ie-polyfill.js');
    }
   return app.toTree();
  }
}

environment.js

// config/environment.js
if (environment === 'development') {
    ENV['ember-cli-mirage'] = {
      enabled: false,
      excludeFilesFromBuild: true // Don't include lodash and everything else mirage needs
    };
}