@baethon/udba-container

@baethon/udba-container

Simple dependancy injection container.

Installation

First, install the package.

npm i @baethon/udba-container

Setup the container in your application.

const { Container } = require('@baethon/udba-container')

module.exports = new Container({
    root: __dirname
})

By default the root option will point to the current working directory (process.cwd()).

Usage

Binding values

const { Container } = require('@baethon/udba-container')

const container = new Container()
container.bind('random', Math.random)

console.log(container.make('random')) // random number
console.log(container.make('random')) // another, different random number

The conainer accepts any value to be bound with the given name. When you pass a function it will be used to resolve the actual value.

Singletons

const { Container } = require('@baethon/udba-container')

const container = new Container()
container.singleton('random', Math.random)

console.log(container.make('random')) // random number
console.log(container.make('random')) // same random number, 
                                      // generated in previous call

Auto resolving

Container supports auto resolving of local files. To resolve a local file you need to give a path to it prefixed with ~. Container will use the root path (passed in options) to resolve the path to the file and then it will load it and resolve the value.

const { Container } = require('@baethon/udba-container')

const container = new Container({ root: __dirname })

console.log(container.make('~src/module'))

Decorators

The package provides decorator functions that can be used with auto resolving

Selfwire

Allows to define a custom binding function used during the resolving of the module.

const { selfwire } = require('@baethon/udba-container/decorators')

class Test {
    constructor (random) {
        this.random = random
    }
}

module.exports = selfwire(Test, app => {
    return new Test(app.make('random'))
})

Inject

Allows to define dependencies that should be resolved by the container and injected in the constructor.

const { inject } = require('@baethon/udba-container/decorators')

class Test {
    constructor (random) {
        this.random = random
    }
}

module.exports = inject(Test, ['random'])

Testing

npm test