Configuration

Build and environment configuration

gulpConfig.js contains configuration for the gulp tasks we use to build and run your application.
app/main.js is the bootstrap of your application. You don't need to concern yourself with this file usually.
app/build.js specifies which JavaScript, JSX, Less CSS and language files your application consists of and should be included in your built application.
```
let js = ['./app/!(assets|gulp)/**/!(*Spec).{js,jsx}'];

let less = [
  './app/assets/less/**/*.less',
  './app/component/**/*.less',
  './app/page/**/*.less'
];

let languages = {
  en: ['./app/**/*EN.json']
};
```
Note: Files can be specified by a filename expansion as you can see above.

The file also specifies the 3rd party vendor libraries to link as ES2015 modules in your application, separated into three groups: common (shared), server-side and client-side.
```
let vendors = {
  common: ['ima'],

  server: [],

  client: []
};
```
Last thing configured in the app/build.js file is a list of compiled JavaScript and CSS files that should be specified in the main html markup.
```
let bundle = {
  js: ['...'],
  es: ['...'],
  css: ['...']
};
```
app/environment.js configures the server-side environment. Note that the dev and test environment configuration automatically inherits values from the prod environment (except for the $Language which has to be configured individually). This configuration is well described in the comments so see the file for full reference.

app/config/services.js by default this file specifies how the fatal application errors should be handled at the client side. Also provides a way to configure other application-wide settings or 3rd party libraries (analytics, etc.).
app/config/routes.js configures your router, mapping routes to the controllers and views in your application. For more information see the Routing page.
app/config/settings.js configures your application and IMA.js services. You can freely extend the configuration as you like except for the properties prefixed by dollar sign $. Note that, again, the dev and test environment configuration automatically inherits values from the prod environment.
and finally, the app/config/bind.js configures the Object container.

All of these files are necessary and must remain in their locations.