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// index.js
'use strict'

const processType = process.env.PROCESS_TYPE

if (processType === 'web') {  
  require('./web')
} else if (processType === 'twitter-stream-worker') {
  require('./worker/twitter-stream')
} else if (processType === 'social-preprocessor-worker') {
  require('./worker/social-preprocessor')
} else {
  throw new Error(`${processType} is an unsupported process type. Use one of: 'web', 'twitter-stream-worker', 'social-preprocessor-worker'!`)
}

// config/index.js
'use strict'

const processType = process.env.PROCESS_TYPE

let config  
try {  
  config = require(`./${processType}`)
} catch (ex) {
  if (ex.code === 'MODULE_NOT_FOUND') {
    throw new Error(`No config for process type: ${processType}`)
  }

  throw ex
}

module.exports = config  

// config/config.js
'use strict'

const common = require('./components/common')  
const logger = require('./components/logger')  
const redis = require('./components/redis')  
const server = require('./components/server')

module.exports = Object.assign({}, common, logger, redis, server)  

const envVarsSchema = joi.object({  
  LOGGER_LEVEL: joi.string()
    .allow(['error', 'warn', 'info', 'verbose', 'debug', 'silly'])
    .default('info'),
  LOGGER_ENABLED: joi.boolean()
    .truthy('TRUE')
    .truthy('true')
    .falsy('FALSE')
    .falsy('false')
    .default(true)
}).unknown()
  .required()

const { error, value: envVars } = joi.validate(process.env, envVarsSchema)  
if (error) {  
  throw new Error(`Config validation error: ${error.message}`)
}

const config = {  
  logger: {
    level: envVars.LOGGER_LEVEL,
    enabled: envVars.LOGGER_ENABLED
  }
}

module.exports = config  

// config/config.js
'use strict'

const joi = require('joi')

const envVarsSchema = joi.object({  
  NODE_ENV: joi.string()
    .allow(['development', 'production', 'test', 'provision'])
    .required(),
  PORT: joi.number()
    .required(),
  LOGGER_LEVEL: joi.string()
    .allow(['error', 'warn', 'info', 'verbose', 'debug', 'silly'])
    .default('info'),
  LOGGER_ENABLED: joi.boolean()
    .truthy('TRUE')
    .truthy('true')
    .falsy('FALSE')
    .falsy('false')
    .default(true)
}).unknown()
  .required()

const { error, value: envVars } = joi.validate(process.env, envVarsSchema)  
if (error) {  
  throw new Error(`Config validation error: ${error.message}`)
}

const config = {  
  env: envVars.NODE_ENV,
  isTest: envVars.NODE_ENV === 'test',
  isDevelopment: envVars.NODE_ENV === 'development',
  logger: {
    level: envVars.LOGGER_LEVEL,
    enabled: envVars.LOGGER_ENABLED
  },
  server: {
    port: envVars.PORT
  }
  // ...
}

module.exports = config

// config/config.js
'use strict'

// required environment variables
[
  'NODE_ENV',
  'PORT'
].forEach((name) => {
  if (!process.env[name]) {
    throw new Error(`Environment variable ${name} is missing`)
  }
})

const config = {  
  env: process.env.NODE_ENV,
  logger: {
    level: process.env.LOG_LEVEL || 'info',
    enabled: process.env.BOOLEAN ? process.env.BOOLEAN.toLowerCase() === 'true' : false
  },
  server: {
    port: Number(process.env.PORT)
  }
  // ...
}

module.exports = config  

.
|-- config
|   |-- components
|   |   |-- common.js
|   |   |-- logger.js
|   |   |-- rabbitmq.js
|   |   |-- redis.js
|   |   |-- server.js
|   |   `-- twitter.js
|   |-- index.js
|   |-- social-preprocessor-worker.js
|   |-- twitter-stream-worker.js
|   `-- web.js
|-- models
|   |-- redis
|   |   |-- index.js
|   |   `-- redis.js
|   |-- tortoise
|   |   |-- index.js
|   |   `-- tortoise.js
|   `-- twitter
|       |-- index.js
|       `-- twitter.js
|-- scripts
|-- test
|   `-- setup.js
|-- web
|   |-- middleware
|   |   |-- index.js
|   |   `-- parseQuery.js
|   |-- router
|   |   |-- api
|   |   |   |-- tweets
|   |   |   |   |-- get.js
|   |   |   |   |-- get.spec.js
|   |   |   |   `-- index.js
|   |   |   `-- index.js
|   |   `-- index.js
|   |-- index.js
|   `-- server.js
|-- worker
|   |-- social-preprocessor
|   |   |-- index.js
|   |   `-- worker.js
|   `-- twitter-stream
|       |-- index.js
|       `-- worker.js
|-- index.js
`-- package.json