emerald-js Container

A badly done DI container

Usage

const {Container, add, factory} = require("@emerald-js/container");
const c = new Container();

c.configure({
  'options': ['fireworks', 'cake'],
  // All functions are implied singletons
  'singleton': c => c.get('options'),
  // Factories will be executed everytime
  'factory': factory(c => c.get('options')),
});

console.log(c.get('options')); // => ['fireworks', 'cake']
console.log(c.get('singleton')); // => ['fireworks', 'cake']
console.log(c.get('factory')); // => ['fireworks', 'cake']

c.configure({
  'options': add('shaved ice')
});

console.log(c.get('options')); // => ['fireworks', 'cake', 'shaved ice']
console.log(c.get('singleton')); // => ['fireworks', 'cake']
console.log(c.get('factory')); // => ['fireworks', 'cake', 'shaved ice']

c.configure({
  'options': []
});

console.log(c.get('options')); // => []
console.log(c.get('singleton')); // => ['fireworks', 'cake']
console.log(c.get('factory')); // => []

API

Container

.add(name, values)

Add values to array located on name, or will create a new array

Shorthand for Container.define(name, add(values))

.factory(name, factoryFunc)

Add factory to Container

Shorthand for Container.define(name, factory(factoryFunc))

.singleton(name, factoryFunc)

Add singleton factory to Container

.configure(keyValueObj)

Adds all items in object to container, accepts modifiers like .define

.define(name, value)

Add items to container by name, accepts modifiers

.get(name, ...args) or .make(name, ...args)

Retrieve item from Container, args is also given to the factory function if applies

.g

An object on which you can receive all items by a getter e.g.

c.define('hello-world', 'yes')

c.g.helloWorld // => 'yes'
c.g['hello-world'] // => 'yes

Modifiers

get(name, ...args)

Will always fetch name from container with given args for this item

c.define('test', factory((c, ...args) => console.log({ args })));
c.define('get_test', get('test', 'no no no'));

c.get('test', 'yes'); // => { args: ['no no no'] }

add(...items)

If an array already exists, items will be added to it

alias(name)

Will fetch name instead and keep arguments intact

factory(func)

Will create a non-singleton factory

value(val)

Will keep given value intact, helpful when you want to provide a function via the Container