config

global.app.config

The app.config object contains the runtime values of your app's configuration. It is assembled automatically when koa-cola project is launched; merging together environment variables, and the configuration objects exported from any and all modules in your app's config/ directory.

> config
    > env
        local.js
        test.js
        development.js
        production.js
    bootstrap.js
    middlewares.js
    model.js
    any_config_you_need.js 
    ...

take any_config_you_need.js for example:

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exports.module = {
  foo : 'bar'
}

so app.config.foo === 'bar'

if environment NODE_ENV is 'development' and config/env/development.js contains:

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exports.module = {
  ...
  foo : 'wow'
  ...
}

then app.config.foo will be override and will be app.config.foo === 'wow'