Envlet - Environment variable parsing

Install

npm install envlet

Usage

var getenv = require('envlet')
  .app('myapp')
  .set('FOO', {
    type: 'int',
    default: 50 // default value must match type.
  })
  .set('BAR', {
    type: 'float'
  })
  .set('BAZ', {
    type: '[ int ]', // array of integer - see typelet
  })
  .alias('BAZ', 'XYZ') // XYZ is aliased to BAZ.
  .parse(); // errors out and print usage if the above aren't satisfied.

getenv.get('FOO'); // ==> process.env.FOO, process.env.MYAPP_FOO or 50
getenv.get('BAR'); // ==> process.env.BAR, process.env.MYAPP_BAR // error if neither exists.
getenv.get('BAZ'); // ==> besides BAZ and MYAPP_BAZ, since XYZ is aliased to BAZ, XYZ and MYAPP_XYZ also responds.

getenv.usage(); // prints the following.
// myapp usage:
//   FOO|MYAPP_FOO:
//     type: integer, default: 50
//   BAR|MYAPP_BAR:
//     type: float, required: true
//   BAZ|MYAPP_BAZ|XYZ|MYAPP_XYZ:
//     type: [ int ]