configurations

configurations

Loads configuration files depending on the environment, the users individual configuration, additional configuration files that are explicitly defined and CLI parameters.

Interface

configuration#load(baseDir, additionalParameters)

Creates a configurations hash out of several overlapping configuration files.

• baseDir the directory configurations are loaded from
• additionalParameters optional additional Parameters e.g. from cli arguments

Logic

Default Configuration

The config file default.(js|json) is always loaded and is the base configuration.

Environment Configuration

The environment is used to load an additional configurations file. Naming convention is {environment}.(js|json). The environment configuration is optional.

User Configuration

For local development an configuration individual for every developer is useful. Will be only loaded if the environment is development. Naming convention is user.{userName}.(js|json). The user configuration is optional.

Additional parameters

Additonal parameters can be specified via a options hash that will be merged into the configuration. cli arguments are a possible source.

External optional additional Configuration

Via the parameters hash the path to an additonal configurations file can be specified. The key for the options hash os externalconfig.

Example

default.js

module.exports = {
    foo: 'bar',
    bax: 'baz',
    spam: 'eggs'
};

/foo/bar/optionalConfig.js

module.exports = {
    spam: 'eggs222'
};

Call

var path = require('path');
var c = require('configurations');

var configuration = c.load(path.join(__dirname, '/config'), {
  bax: 'bazzzz',
  externalconfig: '/foo/bar/optionalConfig.js'
});

Result

{
    foo: 'bar',
    bax: 'bazzzz',
    spam: 'eggs222'
}

Example 2

The file example/example.js contains the following content:

var configuration = configurations.load(path.join(__dirname, '/config'), {
    externalconfig: path.join(__dirname, 'config', 'optional.js'),
    foo: 'foo-cli'
});

Run it with the following parameters:

#1

$ NODE_ENV=development node example/example.js

result:

{ "a": "b", "foo": "foo-cli", "bax": "baz-development", "spam": "eggs2" }

#2

$ NODE_ENV=production node example/example.js

result:

{ "a": "b", "foo": "foo-cli", "bax": "baz-production", "spam": "eggs2" }

#3

$ NODE_ENV=foo node example/example.js

result:

{ "a": "b", "foo": "foo-cli", "bax": "baz", "spam": "eggs2" }