Map-config NPM

map-config

Map configuration objects to application methods.

Install

Install with npm:

$ npm i map-config --save

Usage

var MapConfig = require('map-config');

API

MapConfig

Create a new instance of MapConfig with a specified map and application.

Params

app {Object}: Object containing the methods that will be called based on the map specification.
map {Object}: Optional object specifying how to map a configuration to an application.

Example

var mapper = new MapConfig(app, map);

.map

Map properties to methods and/or functions.

Params

key {String}: property key to map.
val {Function|Object}: Optional function to call when a config has the given key. Functions will be passed (val, key, config) when called. Functions may also take a callback to indicate async usage. May also pass another instance of MapConfig to be processed.
returns {Object} this: to enable chaining

Example

mapper
  .map('baz')
  .map('bang', function(val, key, config) {
  });

.alias

Create an alias for property key.

Params

alias {String}: Alias to use for key.
key {String}: Actual property or method on app.
returns {Object}: Returns the instance for chaining.

Example

mapper.alias('foo', 'bar');

.process

Process a configuration object with the already configured map and app.

Params

config {Object}: Configuration object to map to application methods.
cb {Function}: Optional callback function that will be called when finished or if an error occurs during processing.

Example

mapper.process(config);

.addKey

Add a key to the .keys array. May also be used to add an array of namespaced keys to the .keys array. Useful for mapping "sub-configs" to a key in a parent config.

Params

key {String}: key to push onto .keys
arr {Array}: Array of sub keys to push onto .keys
returns {Object} this: for chaining

Example

mapper.addKey('foo');
console.log(mapper.keys);
//=> ['foo']

var one = new MapConfig();
var two = new MapConfig();
two.map('foo');
two.map('bar');
two.map('baz');

// map config `two` to config `one`
one.map('two', function(val, key, config, next) {
  two.process(val, next);
});

// map keys from config `two` to config `one`
one.addKey('two', two.keys);
console.log(one.keys);
//=> ['two.foo', 'two.bar', 'two.baz']

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