Environment manager

Environment manager for build tasks.

env-manager matches a file with environment variables based on passed arguments.

Install

    $ npm install --save-dev env-manager

Usage

Basic

For example, we have these files with environment variables. (.js files also can be used)

    root
      environment.dev.json  
      environment.test.json  
      environment.prod.json  

    var env = require('env-manager')({
        argv: process.argv
    });

Running this command.

    npm run build -- --env dev

Will return a content from environment.dev.json.

Merge

In order to avoid boilerplate code we can define base environment.json with default values and override them with values from matched file:

    root
      environment.json
      environment.dev.json  
      environment.test.json  
      environment.prod.json  

    var env = require('env-manager')({
        argv: process.argv,
        base: 'environment.json'
    });

    npm run build -- --env dev

Will return a content from environment.json merged with environment.dev.json.

Config override

Alternatevley, you can override config values by passing new values via CLI arguments.

{
  "name": "config",
  "version": "1.0.0",
  "server": {
      "endpoint": "/api",
      "port": 9090
  }
}

    npm run build -- --version 1.1.0-alpha.1 --server.port 9091

Custom pattern and directory

It's possible to define a custom match pattern and custom target directory. Both of these options are independent.

    root
      environments
        linux
          dev.json
          prod.json
        windows
          dev.json
          prod.json

    var path = require('path');
    var env = require('env-manager')({
        argv: process.argv,
        pattern: '{platform}/{env}.json',
        dir: path.join(__dirname, 'environments')
    });

    npm run build -- --env dev --platform linux

Will return a content from environments/linux/dev.json.

API

manager(options)

options.argv

Type: Array<string>.
Process arguments.
Required.

options.dir

Type: string.
Files lookup folder.
Optional.
Default __dirname.

options.base

Type: string.
Base file with environment variables.
If defined, base file will be extended with matched file.
Optional.

options.pattern

Type: string.
File matching pattern based on arguments.
Optional.
Default environment.{env}.json.

options.defaults

Type: object.
Default arguments.
Optional.

License

The MIT License (MIT)
Copyright (C) 2015 Tim Voronov

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.