yarn add penv.macro --dev

npm install penv.macro --save-dev

import env from 'penv.macro'

const BASE_URL = env({
  development: 'https://development.example.com',
  staging: 'https://staging.example.com',
  production: (() => 'https://production.example.com')(),
})

// Assume that the value of `process.env.NODE_ENV` is `production`
const BASE_URL = (() => 'https://production.example.com')()

import env from 'penv.macro'

const BASE_URL = env(
  {
    development: 'https://development.example.com',
    staging: 'https://staging.example.com',
    production: (() => 'https://production.example.com')(),
  },
  'defaultValue',
)

// Assume that the value of `process.env.NODE_ENV` didn't match anything
const BASE_URL = 'defaultValue'

{
  "dependencies": {},
  "babelMacros": {
    "penv": {
      "targetName": "NODE_ENV"
    }
  }
}

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const foo = pickEnv({
  production: 'foo',
  develop: 'foo_dev'
})

const SERVER_URL = env({
  production: 'https://production.example.com'
}) || 'https://development.example.com'

const SERVER_URL = env({
  default: 'https://development.example.com',
  production: 'https://production.example.com'
})

const baseURL = penv({
  [penv.or('develop', 'feature1', 'feature2')]: 'https://example.com'
})