power-di

Power DI

A lightweight Dependency Injection library. Using es6 and other features, remove unnecessary concepts, easy and convenient to use.

Install

npm i power-di --save

Example

a simple example

import { IocContext } from 'power-di'

class AService { }

// default instance, you can also new IocContext to get a instance.
const context = IocContext.DefaultInstance
context.register(AService)
const aService = context.get(AService) // a instance of AService

inject with key

class AService { }

const context = IocContext.DefaultInstance
context.register(AService, 'XService') // key need a string or class, e.g super class or whatever class.
context.get('XService')

use with decorators

import { getDecorators } from '../helper'
const {
    register, append, inject, lazyInject, registerSubClass, lazyInjectSubClass
} = getDecorators() // you can provider a iocContext for this method.

@register()
class AService { }

class SomeClass {
    @inject() // set right now
    private aService: AService

    @lazyInject() // set when using
    private bService: AService
}

context.get(AService)

use in react

import { IocProvider, Component } from 'power-di/react'

@register()
class AService { }

class TestComponent extends Component<{}, {}> {
    componentWillMount() {
        this.GetComponent(AService)
    }

    render(): any {
        return null
    }
}

// parent component, the IocProvider is not necessary.
<IocProvider context={context}>
    <TestComponent />
</IocProvider>

collect some kind of object

class A { }

@register(undefined, { regInSuperClass: true })
class B extends A { }

@registerSubClass() // the abbreviation of above
class C extends A { }

@append(A)
class D { }

class LITestService {
    @lazyInject({ type: A, subClass: true }) // need type when inject subClass, Reflect cannot get the type.
    public testService1: A[] // [b, c, d], the type is A[] or any[] (D may be not instance of A)

    @lazyInjectSubClass({ type: A }) // need type when inject subClass, Reflect cannot get the type.
    public testService2: A[] // the abbreviation of above
}

See the test case for details.

Changelog

1.4.17 / 2019-02-26

• update: deps.
• chore: add multi level inject test.